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Articles 31 - 40 of 40
Full-Text Articles in Physics
Evidence Against A Mean-Field Description Of Short-Range Spin Glasses Revealed Through Thermal Boundary Conditions, Wenlong Wang, Jonathan Machta, Helmut G. Katzgraber
Evidence Against A Mean-Field Description Of Short-Range Spin Glasses Revealed Through Thermal Boundary Conditions, Wenlong Wang, Jonathan Machta, Helmut G. Katzgraber
Jonathan Machta
A theoretical description of the low-temperature phase of short-range spin glasses has remained elusive for decades. In particular, it is unclear if theories that assert a single pair of pure states, or theories that are based on infinitely many pure states—such as replica symmetry breaking—best describe realistic short-range systems. To resolve this controversy, the three-dimensional Edwards-Anderson Ising spin glass in thermal boundary conditions is studied numerically using population annealing Monte Carlo. In thermal boundary conditions all eight combinations of periodic vs antiperiodic boundary conditions in the three spatial directions appear in the ensemble with their respective Boltzmann weights, thus minimizing …
Low-Temperature Behavior Of The Statistics Of The Overlap Distribution In Ising Spin-Glass Models, Matthew Wittmann, B. Yucesoy, Helmut G. Katzgraber, Jonathan Machta, A. P. Young
Low-Temperature Behavior Of The Statistics Of The Overlap Distribution In Ising Spin-Glass Models, Matthew Wittmann, B. Yucesoy, Helmut G. Katzgraber, Jonathan Machta, A. P. Young
Jonathan Machta
Using Monte Carlo simulations, we study in detail the overlap distribution for individual samples for several spin-glass models including the infinite-range Sherrington-Kirkpatrick model, short-range Edwards-Anderson models in three and four space dimensions, and one-dimensional long-range models with diluted power-law interactions. We study three long-range models with different powers as follows: The first is approximately equivalent to a short-range model in three dimensions, the second to a short-range model in four dimensions, and the third to a short-range model in the mean-field regime. We study an observable proposed earlier by some of us which aims to distinguish the “replica symmetry breaking” …
Muon-Spin Rotation Measurements Of The Vortex State In Sr2ruo4: Type-1.5 Superconductivity, Vortex Clustering And A Crossover From A Triangular To A Square Vortex Lattice, S.J. Ray, A.S. Gibbs, S.J. Bending, P.J. Curran, Egor Babaev, C. Baines, A.P. Mackenzie, S.L. Lee
Muon-Spin Rotation Measurements Of The Vortex State In Sr2ruo4: Type-1.5 Superconductivity, Vortex Clustering And A Crossover From A Triangular To A Square Vortex Lattice, S.J. Ray, A.S. Gibbs, S.J. Bending, P.J. Curran, Egor Babaev, C. Baines, A.P. Mackenzie, S.L. Lee
Egor Babaev
Muon-spin rotation has been used to probe the vortex state in Sr2RuO4. At moderate fields and temperatures a lattice of triangular symmetry is observed, crossing over to a lattice of square symmetry with increasing field and temperature. At lower fields it is found that there are large regions of the sample that are completely free from vortices which grow in volume as the temperature falls. Importantly this is accompanied by increasing vortex density and increasing disorder within the vortex-cluster-containing regions. Both effects are expected to result from the strongly temperature-dependent long-range vortex attractive forces arising from the multiband chiral-order superconductivity.
Skyrmions Induced By Dissipationless Drag In U(1) U (1) Superconductors, Julien Garaud, Karl A. H. Sellin, Juha JAykk, Egor Babaev
Skyrmions Induced By Dissipationless Drag In U(1) U (1) Superconductors, Julien Garaud, Karl A. H. Sellin, Juha JAykk, Egor Babaev
Egor Babaev
Rather generically, multicomponent superconductors and superfluids have intercomponent current-current interaction. We show that in superconductors with substantially strong intercomponent drag interaction, the topological defects which form in an external field are characterized by a skyrmionic topological charge. We then demonstrate that they can be distinguished from ordinary vortex matter by a very characteristic magnetization process due to the dipolar nature of inter-skyrmion forces. The results provide an experimental signature to confirm or rule out the formation p-wave state with reduced spin stiffness in p-wave superconductors.
Microscopic Prediction Of Skyrmion Lattice State In Clean Interface Superconductors, Daniel F. Agterberg, Egor Babaev, Julien Garaud
Microscopic Prediction Of Skyrmion Lattice State In Clean Interface Superconductors, Daniel F. Agterberg, Egor Babaev, Julien Garaud
Egor Babaev
When an in-plane field is applied to a clean interface superconductor, a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)-like phase is stabilized. This phase has a U(1)×U(1) symmetry and, in principle, this symmetry allows for flux carrying topological excitations different from Abrikosov vortices (which are the simplest defects associated with S1 → S1 maps). However, in practice, largely due to electromagnetic and other intercomponent interactions, such topological excitations are very rare in superconducting systems. Here, we demonstrate that a realistic microscopic theory for interface superconductors, such as SrTiO3/LaAlO3, predicts an unconventional magnetic response where the flux-carrying objects are skyrmions, characterized by homotopy invariants of S2 …
Topological Defects In Mixtures Of Superconducting Condensates With Different Charges, Julien Garaud, Egor Babaev
Topological Defects In Mixtures Of Superconducting Condensates With Different Charges, Julien Garaud, Egor Babaev
Egor Babaev
We investigate the topological defects in phenomenological models describing mixtures of charged condensates with commensurate electric charges. Such situations are expected to appear for example in liquid metallic deuterium. This is modeled by a multicomponent Ginzburg-Landau theory where the condensates are coupled to the same gauge field by different coupling constants whose ratio is a rational number. We also briefly discuss the case where electric charges are incommensurate. Flux quantization and finiteness of the energy per unit length dictate that the different condensates have different winding and thus different number of (fractional) vortices. Competing attractive and repulsive interactions lead to …
Erratum: Glassy Chimeras Could Be Blind To Quantum Speedup: Designing Better Benchmarks For Quantum Annealing Machines, Martin Weigel, Helmut G. Katzgraber, Jonathan Machta, Firas Hamze, Ruben S. Andrist
Erratum: Glassy Chimeras Could Be Blind To Quantum Speedup: Designing Better Benchmarks For Quantum Annealing Machines, Martin Weigel, Helmut G. Katzgraber, Jonathan Machta, Firas Hamze, Ruben S. Andrist
Jonathan Machta
No abstract provided.
Phase Transitions And Anomalous Normal State In Superconductors With Broken Time Reversal Symmetry, Troels Arnfred Bojesen, Egor Babaev, Asle Sudbo
Phase Transitions And Anomalous Normal State In Superconductors With Broken Time Reversal Symmetry, Troels Arnfred Bojesen, Egor Babaev, Asle Sudbo
Egor Babaev
No abstract provided.
Rotational Response Of Superconductors: Magneto-Rotational Isomorphism And Rotation-Induced Vortex Lattice, Egor Babaev, Boris Svistunov
Rotational Response Of Superconductors: Magneto-Rotational Isomorphism And Rotation-Induced Vortex Lattice, Egor Babaev, Boris Svistunov
Egor Babaev
The analysis of nonclassical rotational response of superfluids and superconductors was performed by Onsager [Onsager, Nuovo Cimento, Suppl. 6, 279 (1949)] and London [Superfluids(Wiley, New York, 1950)] and crucially advanced by Feynman [Prog. Low Temp. Phys. 1, 17 (1955)]. It was established that, in the thermodynamic limit, neutral superfluids rotate by forming—without any threshold—a vortex lattice. In contrast, the rotation of superconductors at angular frequency —supported by uniform magnetic field BL ∝ due to surface currents—is of the rigid-body type (London law). Here we show that, neglecting the centrifugal effects, the behavior of a rotating superconductor is identical to that …
Vortex Matter In U(1)×U(1)×Z2 Phase-Separated Superconducting Condensates, Julien Garaud, Egor Babaev
Vortex Matter In U(1)×U(1)×Z2 Phase-Separated Superconducting Condensates, Julien Garaud, Egor Babaev
Egor Babaev
We study the properties of vortex solutions and magnetic response of two-component U(1)×U(1)×Z2 superconductors, with phase separation driven by intercomponent density-density interaction. Such a theory can be viewed arising from the breakdown of SU(2) symmetry by a biquadratic interaction between the components of the field. Depending on the symmetry-breaking term, there are two ground-state phases: one where both components of the doublet are equal (the miscible phase) and one where only one component assumes a nonzero vacuum expectation value (the immiscible state). In the latter phase, the spectrum of topological excitations contains both domain walls and vortices. We show the …