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Articles 1 - 30 of 230
Full-Text Articles in Physics
Search For Supersymmetry In Events With Four Or More Charged Leptons In 139 Fb−1 Of S√ = 13 Tev Pp Collisions With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama Sherif Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Search For Supersymmetry In Events With Four Or More Charged Leptons In 139 Fb−1 Of S√ = 13 Tev Pp Collisions With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama Sherif Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
A search for supersymmetry in events with four or more charged leptons (electrons, muons and tau-leptons) is presented. The analysis uses a data sample corresponding to 139 fb(-1) of proton-proton collisions delivered by the Large Hadron Collider at root s = 13 TeV and recorded by the ATLAS detector. Four-lepton signal regions with up to two hadronically decaying tau-leptons are designed to target several supersymmetric models, while a general five-lepton signal region targets any new physics phenomena leading to a final state with five charged leptons. Data yields are consistent with Standard Model expectations and results are used to set …
Search For Squarks And Gluinos In Final States With One Isolated Lepton, Jets, And Missing Transverse Momentum At S√=13 Tev With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Search For Squarks And Gluinos In Final States With One Isolated Lepton, Jets, And Missing Transverse Momentum At S√=13 Tev With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
The results of a search for gluino and squark pair production with the pairs decaying via the lightest charginos into a final state consisting of two W bosons, the lightest neutralinos ((chi) over tilde (0)(1)), and quarks, are presented: the signal is characterised by the presence of a single charged lepton (e(+/-) or mu(+/-)) from a W boson decay, jets, and missing transverse momentum. The analysis is performed using 139 fb(-1) of proton-proton collision data taken at a centre-of-mass energy root s = 13 delivered by the Large Hadron Collider and recorded by the ATLAS experiment. No statistically significant excess …
Search For Pair Production Of Third-Generation Scalar Leptoquarks Decaying Into A Top Quark And A Τ-Lepton In Pp Collisions At S√ = 13 Tev With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Dale K. Abhayasinghe, Syed H. Abidi, Ossama S. Abouzeid, Nicola L. Abraham, Halina Abramowicz
Search For Pair Production Of Third-Generation Scalar Leptoquarks Decaying Into A Top Quark And A Τ-Lepton In Pp Collisions At S√ = 13 Tev With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Dale K. Abhayasinghe, Syed H. Abidi, Ossama S. Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
A search for pair production of third-generation scalar leptoquarks decaying into a top quark and a tau-lepton is presented. The search is based on a dataset of pp collisions at root s = 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb(-1). Events are selected if they have one light lepton (electron or muon) and at least one hadronically decaying tau-lepton, or at least two light leptons. In addition, two or more jets, at least one of which must be identified as containing b-hadrons, are required. …
Muon Reconstruction And Identification Efficiency In Atlas Using The Full Run 2 Pp Collision Data Set At S√=13 Tev, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Abouzeid, Nicola L. Abraham, Halina Abramowicz
Muon Reconstruction And Identification Efficiency In Atlas Using The Full Run 2 Pp Collision Data Set At S√=13 Tev, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
This article documents the muon reconstruction and identification efficiency obtained by the ATLAS experiment for 139 fb-1 of pp collision data at s=13 TeV collected between 2015 and 2018 during Run 2 of the LHC. The increased instantaneous luminosity delivered by the LHC over this period required a reoptimisation of the criteria for the identification of prompt muons. Improved and newly developed algorithms were deployed to preserve high muon identification efficiency with a low misidentification rate and good momentum resolution. The availability of large samples of Z -> mu mu and J/psi -> mu mu decays, and the minimisation of …
A Real Triplet-Singlet Extended Standard Model: Dark Matter And Collider Phenomenology, Nicole F. Bell, Matthew J. Dolan, Leon S. Friedrich, Michael J. Ramsey-Musolf, Raymond R. Volkas
A Real Triplet-Singlet Extended Standard Model: Dark Matter And Collider Phenomenology, Nicole F. Bell, Matthew J. Dolan, Leon S. Friedrich, Michael J. Ramsey-Musolf, Raymond R. Volkas
Physics Department Faculty Publication Series
We examine the collider and dark matter phenomenology of the Standard Model extended by a hypercharge-zero SU(2) triplet scalar and gauge singlet scalar. In particular, we study the scenario where the singlet and triplet are both charged under a single Z(2) symmetry. We find that such an extension is capable of generating the observed dark matter density, while also modifying the collider phenomenology such that the lower bound on the mass of the triplet is smaller than in minimal triplet scalar extensions to the Standard Model. A high triplet mass is in tension with the parameter space that leads to …
New Precise Spectroscopy Of The Hyperfine Structure In Muonium With A High-Intensity Pulsed Muon Beam, S. Kanda, Y. Fukao, Y. Ikedo, K. Ishida, M. Iwasaki, D. Kawall, N. Kawamura, K. M. Kojima, N. Kurosawa, Y. Matsuda
New Precise Spectroscopy Of The Hyperfine Structure In Muonium With A High-Intensity Pulsed Muon Beam, S. Kanda, Y. Fukao, Y. Ikedo, K. Ishida, M. Iwasaki, D. Kawall, N. Kawamura, K. M. Kojima, N. Kurosawa, Y. Matsuda
Physics Department Faculty Publication Series
A hydrogen-like atom consisting of a positive muon and an electron is known as muonium. It is a near-ideal two-body system for a precision test of bound-state theory and fundamental symmetries. The MuSEUM collaboration performed a new precision measurement of the muonium ground-state hyperfine structure at J-PARC using a high-intensity pulsed muon beam and a high-rate capable positron counter. The resonance of hyperfine transition was successfully observed at a near-zero magnetic field, and the muonium hyperfine structure interval of nu(HFS) = 4.463302(4) GHz was obtained with a relative precision of 0.9 ppm. The result was consistent with the previous ones …
Measurements Of W+W−+ ≥ 1 Jet Production Cross-Sections In Pp Collisions At S√ = 13 Tev With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Measurements Of W+W−+ ≥ 1 Jet Production Cross-Sections In Pp Collisions At S√ = 13 Tev With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
Fiducial and differential cross-section measurements of W+W- production in association with at least one hadronic jet are presented. These measurements are sensitive to the properties of electroweak-boson self-interactions and provide a test of perturbative quantum chromodynamics and the electroweak theory. The analysis is performed using proton-proton collision data collected at s = 13 TeV with the ATLAS experiment, corresponding to an integrated luminosity of 139 fb(-1). Events are selected with exactly one oppositely charged electron-muon pair and at least one hadronic jet with a transverse momentum of p(T)> 30 GeV and a pseudorapidity of |eta| < 4.5. After subtracting the background contributions and correcting for detector effects, the jet-inclusive W+W-+ >= 1 jet fiducial cross-section …
Measurements Of Differential Cross-Sections In Four-Lepton Events In 13 Tev Proton-Proton Collisions With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Measurements Of Differential Cross-Sections In Four-Lepton Events In 13 Tev Proton-Proton Collisions With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
Measurements of four-lepton differential and integrated fiducial cross-sections in events with two same-flavour, opposite-charge electron or muon pairs are presented. The data correspond to 139 fb(-1) of root s = 13 TeV proton-proton collisions, collected by the ATLAS detector during Run 2 of the Large Hadron Collider (2015-2018). The final state has contributions from a number of interesting Standard Model processes that dominate in different four-lepton invariant mass regions, including single Z boson production, Higgs boson production and on-shell ZZ production, with a complex mix of interference terms, and possible contributions from physics beyond the Standard Model. The differential cross-sections …
Superuniversality Of Superdiffusion, Enej Ilievski, Jacopo De Nardis, Sarang Gopalakrishnan, Romain Vasseur, Brayden Ware
Superuniversality Of Superdiffusion, Enej Ilievski, Jacopo De Nardis, Sarang Gopalakrishnan, Romain Vasseur, Brayden Ware
Physics Department Faculty Publication Series
Anomalous finite-temperature transport has recently been observed in numerical studies of various integrable models in one dimension; these models share the feature of being invariant under a continuous non-Abelian global symmetry. This work offers a comprehensive group-theoretic account of this elusive phenomenon. For an integrable quantum model with local interactions, invariant under a global non-Abelian simple Lie group G, we find that finite-temperature transport of Noether charges associated with symmetry G in thermal states that are invariant under G is universally superdiffusive and characterized by the dynamical exponent z = 3/2. This conclusion holds regardless of the Lie algebra symmetry, …
Determination Of The Parton Distribution Functions Of The Proton From Atlas Measurements Of Differential W± And Z Boson Production In Association With Jets, Atlas Collaboration, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed Haider Abidi, Ossama Sherif Alexander Abouzeid, Nicola L. Abraham
Determination Of The Parton Distribution Functions Of The Proton From Atlas Measurements Of Differential W± And Z Boson Production In Association With Jets, Atlas Collaboration, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed Haider Abidi, Ossama Sherif Alexander Abouzeid, Nicola L. Abraham
Physics Department Faculty Publication Series
This article presents a new set of proton parton distribution functions, AT-LASepWZVjet20, produced in an analysis at next-to-next-to-leading order in QCD. The new data sets considered are the measurements of W+ and W- boson and Z boson production in association with jets in pp collisions at root s = 8TeV performed by the ATLAS experiment at the LHC with integrated luminosities of 20.2 fb(-1) and 19.9 fb(-1), respectively. The analysis also considers the ATLAS measurements of differential W-+/- and Z boson production at root s = 7 TeV with an integrated luminosity of 4.6 fb(-1) and deep-inelastic-scattering data from e(+/-) …
Measurement Of Single Top-Quark Production In Association With A W Boson In The Single-Lepton Channel At S√=8tev With The Atlas Detector, Georges Aad, Braden Abbott, D. C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed Haider Abidi, Ossama Sherif Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Measurement Of Single Top-Quark Production In Association With A W Boson In The Single-Lepton Channel At S√=8tev With The Atlas Detector, Georges Aad, Braden Abbott, D. C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed Haider Abidi, Ossama Sherif Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
The production cross-section of a top quark in association with a W boson is measured using proton-proton collisions at root s = 8 TeV. The dataset corresponds to an integrated luminosity of 20.2 fb(-1,) and was collected in 2012 by the ATLAS detector at the Large Hadron Collider at CERN. The analysis is performed in the single-lepton channel. Events are selected by requiring one isolated lepton (electron or muon) and at least three jets. A neural network is trained to separate the tW signal from the dominant t (t) over bar background. The cross-section is extracted from a binned profile …
Measurements Of The Inclusive And Differential Production Cross Sections Of A Top-Quark-Antiquark Pair In Association With A Z Boson At S√=13 Tev With The Atlas Detector, Atlas Collaboration, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed Haider Abidi, Ossama Sherif Alexander Abouzeid, Nicola L. Abraham
Measurements Of The Inclusive And Differential Production Cross Sections Of A Top-Quark-Antiquark Pair In Association With A Z Boson At S√=13 Tev With The Atlas Detector, Atlas Collaboration, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed Haider Abidi, Ossama Sherif Alexander Abouzeid, Nicola L. Abraham
Physics Department Faculty Publication Series
Measurements of both the inclusive and differential production cross sections of a top-quark-antiquark pair in association with a Z boson (t (t) over barZ) are presented. The measurements are performed by targeting final states with three or four isolated leptons (electrons or muons) and are based on root s = 13 TeV proton-proton collision data with an integrated luminosity of 139 fb(-1), recorded from 2015 to 2018 with the ATLAS detector at the CERN Large Hadron Collider. The inclusive cross section is measured to be a sigma(t (t) over barZ)= 0.99 +/- 0.05 (stat.) +/- 0.08 (syst.) pb, in agreement …
Search For Doubly And Singly Charged Higgs Bosons Decaying Into Vector Bosons In Multi-Lepton Final States With The Atlas Detector Using Proton-Proton Collisions At √ S= 13 Tev, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Search For Doubly And Singly Charged Higgs Bosons Decaying Into Vector Bosons In Multi-Lepton Final States With The Atlas Detector Using Proton-Proton Collisions At √ S= 13 Tev, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
A search for charged Higgs bosons decaying into (WW +/-)-W-+/- or W(+/-)Z bosons is performed, involving experimental signatures with two leptons of the same charge, or three or four leptons with a variety of charge combinations, missing transverse momentum and jets. A data sample of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider between 2015 and 2018 is used. The data correspond to a total integrated luminosity of 139 fb(-1). The search is guided by a type-II seesaw model that extends the scalar sector of the Standard Model with …
Search For Charged Higgs Bosons Decaying Into A Top Quark And A Bottom Quark At √ S= 13 Tev With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Search For Charged Higgs Bosons Decaying Into A Top Quark And A Bottom Quark At √ S= 13 Tev With The Atlas Detector, Georges Aad, Braden Abbott, Dale C. Abbott, Adam Abed Abud, Kira Abeling, Deshan K. Abhayasinghe, Syed H. Abidi, Ossama S. Alexander Abouzeid, Nicola L. Abraham, Halina Abramowicz
Physics Department Faculty Publication Series
A search for charged Higgs bosons decaying into a top quark and a bottom quark is presented. The data analysed correspond to 139 fb(-1) of proton-proton collisions at root s = 13TeV, recorded with the ATLAS detector at the LHC. The production of a heavy charged Higgs boson in association with a top quark and a bottom quark, pp -> tbH(+) -> tbtb, is explored in the H+ mass range from 200 to 2000 GeV using final states with jets and one electron or muon. Events are categorised according to the multiplicity of jets and b-tagged jets, and multivariate analysis …
Resurgence Of The Qcd Adler Function, Alessio Maiezza, Juan Carlos Vasquez
Resurgence Of The Qcd Adler Function, Alessio Maiezza, Juan Carlos Vasquez
Physics Department Faculty Publication Series
We study the QCD Adler function in the energy region approximate to 0.7 - 2.5 GeV, in which the non-perturbative effects become dominant. Our analysis is a renormalon-based evaluation using transseries within the resurgence of the Renormalization-Group-Equation and does not require the Operator-Product-Expansion. (C) 2021 The Author(s). Published by Elsevier B.V.
Long-Lived Sterile Neutrinos At The Lhc In Effective Field Theory, Jordy De Vries, Herbert K. Dreiner, Julian Y. Günther, Zeren Simon Wang, Guanghui Zhou
Long-Lived Sterile Neutrinos At The Lhc In Effective Field Theory, Jordy De Vries, Herbert K. Dreiner, Julian Y. Günther, Zeren Simon Wang, Guanghui Zhou
Physics Department Faculty Publication Series
We study the prospects of a displaced-vertex search of sterile neutrinos at the Large Hadron Collider (LHC) in the framework of the neutrino-extended Standard Model Effective Field Theory (nu SMEFT). The production and decay of sterile neutrinos can proceed via the standard active-sterile neutrino mixing in the weak current, as well as through higher-dimensional operators arising from decoupled new physics. If sterile neutrinos are long-lived, their decay can lead to displaced vertices which can be reconstructed. We investigate the search sensitivities for the ATLAS/CMS detector, the future far-detector experiments: AL3X, ANUBIS, CODEX-b, FASER, MATHUSLA, and MoEDAL-MAPP, and at the proposed …
An Online Radon Monitor For Low-Background Detector Assembly Facilities, K. Pelczar, G. Zuzel, M. Wójcik, A. Pocar, An. Ianni
An Online Radon Monitor For Low-Background Detector Assembly Facilities, K. Pelczar, G. Zuzel, M. Wójcik, A. Pocar, An. Ianni
Physics Department Faculty Publication Series
Backgrounds from long-lived radon decay products are often problematic for low-energy neutrino and rareevent experiments. These isotopes, specifically 210Pb, 210Bi, and 210Po, easily plate out onto surfaces exposed to radonloaded air. The alpha emitter 210Po is particularly dangerous for detectors searching for weakly-interacting dark matter particles. Neutrons produced via (a, n) reactions in detector materials are, in some cases, a residual background that can limit the sensitivity of the experiment. An effective solution is to reduce the 222Rn activity in the air in contact with detector components during fabrication, assembly, commissioning, and operation. We present the design, construction, calibration procedures …
Evolving Black Holes In Inflation, Ruth Gregory, David Kastor, Jennie Traschen
Evolving Black Holes In Inflation, Ruth Gregory, David Kastor, Jennie Traschen
Physics Department Faculty Publication Series
We present an analytic, perturbative solution to the Einstein equations with a scalar field that describes dynamical black holes in a slow-roll inflationary cosmology. We show that the metric evolves quasi-statically through a sequence of Schwarzschild–de Sitter like metrics with time dependent cosmological constant and mass parameters, such that the cosmological constant is instantaneously equal to the value of the scalar potential. The areas of the black hole and cosmological horizons each increase in time as the effective cosmological constant decreases, and the fractional area increase is proportional to the fractional change of the cosmological constant, times a geometrical factor. …
Gapless Symmetry-Protected Topological Order, Thomas Scaffidi, Daniel E. Parker, Romain Vasseur
Gapless Symmetry-Protected Topological Order, Thomas Scaffidi, Daniel E. Parker, Romain Vasseur
Physics Department Faculty Publication Series
We introduce exactly solvable gapless quantum systems in d dimensions that support symmetry-protected topological (SPT) edge modes. Our construction leads to long-range entangled, critical points or phases that can be interpreted as critical condensates of domain walls “decorated” with dimension (d−1) SPT systems. Using a combination of field theory and exact lattice results, we argue that such gapless SPT systems have symmetry-protected topological edge modes that can be either gapless or symmetry broken, leading to unusual surface critical properties. Despite the absence of a bulk gap, these edge modes are robust against arbitrary symmetry-preserving local perturbations near the …
Polarization Dependent Switching Of Asymmetric Nanorings With A Circular Field, Nihar R. Pradhan, Mark T. Tuominen, Katherine E. Aidala
Polarization Dependent Switching Of Asymmetric Nanorings With A Circular Field, Nihar R. Pradhan, Mark T. Tuominen, Katherine E. Aidala
Physics Department Faculty Publication Series
We experimentally investigated the switching from onion to vortex states in asymmetric cobalt nanorings by an applied circular field. An in-plane field is applied along the symmetric or asymmetric axis of the ring to establish domain walls (DWs) with symmetric or asymmetric polarization. A circular field is then applied to switch from the onion state to the vortex state, moving the DWs in the process. The asymmetry of the ring leads to different switching fields depending on the location of the DWs and direction of applied field. For polarization along the asymmetric axis, the field required to move the DWs …
Mass Flux And Solid Growth In Solid 4he: 60 Mk - 700 Mk, M Ray, R Hallock
Mass Flux And Solid Growth In Solid 4he: 60 Mk - 700 Mk, M Ray, R Hallock
Physics Department Faculty Publication Series
We use the thermo-mechanical effect to create a chemical potential difference between two liquid reservoirs connected to each other through Vycor rods in series with solid hcp 4He to confirm that a DC flux of atoms takes place below 600 mK, but find that the flux falls abruptly in the vicinity of 80 mK. It is impossible to add density to a solid freshly made at 60 mK and samples freshly made at 60 mK do not allow mass flux, even when raised in temperature to 200 mK. Solids created above 300 mK and cooled to 60 mK accept added …
Non-Pairwise Intervortex Interaction Forces, Johan Carlstrom, Julien Garaud, Egor Babaev
Non-Pairwise Intervortex Interaction Forces, Johan Carlstrom, Julien Garaud, Egor Babaev
Physics Department Faculty Publication Series
We demonstrate the existence of a new kind of non-pairwise multivortex interaction forces, which are present between superconducting vortices along with pairwise vortex interactions. We show that the multibody forces are especially important in compact vortex clusters in two-component type-1.5 superconductors and result in extremely rich physics of multivortex bound states.
Type-1.5 Superconductivity In Multiband Systems: The Eects Of Interband Couplings, Johan Carlstrom, Egor Babaev, Martin Speight
Type-1.5 Superconductivity In Multiband Systems: The Eects Of Interband Couplings, Johan Carlstrom, Egor Babaev, Martin Speight
Physics Department Faculty Publication Series
In contrast to single-component superconductors, which are described at the level of Ginzburg- Landau theory by a single parameter and are divided in type-I < 1= p 2 and type-II > 1= p 2 classes, two-component systems in general possesses three fundamental length scales and have been shown to possess a separate \type-1.5" superconducting state1,2. In that state, as a consequence of the extra fundamental length scale, vortices attract one another at long range but repel at shorter ranges, and therefore should form clusters in low magnetic elds. In such clusters one can dene a negative interface energy inside a cluster and at the same there one …
Observation Of Thermomechanical Equilibration In The Presence Of A Solid 4he Conduit, M Ray, R Hallock
Observation Of Thermomechanical Equilibration In The Presence Of A Solid 4he Conduit, M Ray, R Hallock
Physics Department Faculty Publication Series
We observe a thermomechanical effect when a chemical-potential difference is created by a temperature difference imposed between two liquid reservoirs connected to each other through Vycor rods in series with solid hcp 4He. By creating a temperature difference, ΔT, between the two reservoirs, we induce a rate-limited growth of a pressure difference between the two reservoirs, ΔP. In equilibrium ΔP vs ΔT is in quantitative agreement with the thermomechanical effect in superfluid helium. These observations confirm that below ∼600 mK a flux-limited flow exists through the solid helium.
Growth Of Solid Hcp 4he Off The Melting Curve, M Ray, R Hallock
Growth Of Solid Hcp 4he Off The Melting Curve, M Ray, R Hallock
Physics Department Faculty Publication Series
We report studies of the growth of solid hcp 4He at pressures higher than the bulk freezing pressure using a cell design that allows us to inject atoms into the solid. Near the melting curve during injection we observe random events during which the pressure recorded in the cell drops abruptly. These events are accompanied by transient increases in the temperature of the cell. We discuss these transients and conclude that they represent the solidification of meta-stable liquid regions and the associated relief of strain in the local solid. We also observe that further from the melting curve the transients …
Elastic Building Blocks For Confined Sheets, R Schroll, Katifori, B Davidovitch
Elastic Building Blocks For Confined Sheets, R Schroll, Katifori, B Davidovitch
Physics Department Faculty Publication Series
We study the behavior of thin elastic sheets that are bent and strained under the influence of weak, smooth confinement. We show that the emerging shapes exhibit the coexistence of two types of domains that differ in their characteristic stress distributions and energies, and reflect different constraints. A focused-stress patch is subject to a geometric, piecewise-inextensibility constraint, whereas a diffuse-stress region is characterized by a mechanical constraint - the dominance of a single component of the stress tensor. We discuss the implications of our findings for the analysis of elastic sheets that are subject to various types of forcing.
Smooth Cascade Of Wrinkles At The Edge Of A Floating Elastic Film, J Huang, B Davidovitch, C Santangelo, T Russell, N Menon
Smooth Cascade Of Wrinkles At The Edge Of A Floating Elastic Film, J Huang, B Davidovitch, C Santangelo, T Russell, N Menon
Physics Department Faculty Publication Series
An ultrathin polymer sheet floating on a fluid forms a periodic pattern of parallel wrinkles when subjected to uniaxial compression. The wave number of the wrinkle pattern increases sharply near the fluid meniscus where the translational symmetry of this one-dimensional corrugated profile is broken. We show that the observed multiscale morphology is controlled by a new “softness” number that quantifies the relative strength of capillary forces at the edge and the rigidity of the bulk pattern. We discover a new elastic cascade by which the wrinkling pattern in the bulk is smoothly matched to the fine structure at the edge …
A Simple Radionuclide-Driven Single-Ion Source, M Montero Diez, T Daniels, K Kumar, A Pocar, Et. Al.
A Simple Radionuclide-Driven Single-Ion Source, M Montero Diez, T Daniels, K Kumar, A Pocar, Et. Al.
Physics Department Faculty Publication Series
We describe a source capable of producing single barium ions through nuclear recoils in radioactive decay. The source is fabricated by electroplating 148Gd onto a silicon α-particle detector and vapor depositing a layer of BaF2 over it. 144Sm recoils from the alpha decay of 148Gd are used to dislodge Ba+ ions from the BaF2 layer and emit them in the surrounding environment. The simultaneous detection of an α particle in the substrate detector allows for tagging of the nuclear decay and of the Ba+ emission. The source is simple, durable, and can be manipulated and used in different environments. We …
Suppression Of The Critical Temperature For Superfluidity Near The Mott Transition, S Trotzky, L Pollet, F Gerbier, U Schnorrberger, I Bloch, Nikolai Prokof'ev, Boris Svistunov, M Troyer
Suppression Of The Critical Temperature For Superfluidity Near The Mott Transition, S Trotzky, L Pollet, F Gerbier, U Schnorrberger, I Bloch, Nikolai Prokof'ev, Boris Svistunov, M Troyer
Physics Department Faculty Publication Series
Ultracold atomic gases in optical lattices have proven to be a controllable, tunable and clean implementation of strongly interacting quantum many-body systems. An essential prospect for such quantum simulators is their ability to map out the phase diagram of fundamental many-body model Hamiltonians. However, the results need to be validated first for representative benchmark problems through state-of-the-art numerical methods of quantum many-body theory. Here we present the first ab initio comparison between experiments and quantum Monte Carlo simulations for strongly interacting Bose gases on a lattice for large systems (up to particles). The comparison enables thermometry for the interacting quantum …
Sharp Transition For Single Polarons In The One-Dimensional Su-Schrieffer-Heeger Model, D Marchand, G De Filippis, V Cataudella, M Berciu, N Nagaosa, Nikolai Prokof'ev, A Mishchenko, P Stamp
Sharp Transition For Single Polarons In The One-Dimensional Su-Schrieffer-Heeger Model, D Marchand, G De Filippis, V Cataudella, M Berciu, N Nagaosa, Nikolai Prokof'ev, A Mishchenko, P Stamp
Physics Department Faculty Publication Series
We study a single polaron in the Su-Schrieffer-Heeger (SSH) model using four different techniques (three numerical and one analytical). Polarons show a smooth crossover from weak to strong coupling, as a function of the electron-phonon coupling strength λ, in all models where this coupling depends only on phonon momentum q. In the SSH model the coupling also depends on the electron momentum k; we find it has a sharp transition, at a critical coupling strength λc, between states with zero and nonzero momentum of the ground state. All other properties of the polaron are also singular at λ=λc. This result …