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- Cuprates (3)
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- Hole doped cuprates (2)
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- Berryonic matter (1)
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- Model analytic solution (1)
- Mott gap (1)
- Nd₂₋ₓCeₓCuO₄ (1)
- Non-Fermi-liquid behavior (1)
- Ordered stripe phases (1)
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Articles 1 - 11 of 11
Full-Text Articles in Physical Sciences and Mathematics
Effect Of Hole Doping On The Electronic Structure Of Tl2201, S. Sahrakorpi, Hsin Lin, R. S. Markiewicz, A. Bansil
Effect Of Hole Doping On The Electronic Structure Of Tl2201, S. Sahrakorpi, Hsin Lin, R. S. Markiewicz, A. Bansil
Robert Markiewicz
We discuss doping dependencies of the electronic structure and Fermi surface of the monolayer Tl$_{2-x}$Cu$_x$Ba$_2$CuO$_{6+\delta}$ (Tl2201). The TlO bands are found to be particularly sensitive to doping in that these bands rapidly move to higher energies as holes are added into the system. Such doping effects beyond the rigid band picture should be taken into account in analyzing and modeling the electronic spectra of the cuprates.
Dispersion Of Ordered Stripe Phases In The Cuprates, R. S. Markiewicz
Dispersion Of Ordered Stripe Phases In The Cuprates, R. S. Markiewicz
Robert Markiewicz
A phase separation model is presented for the stripe phase of the cuprates, which allows the doping dependence of the photoemission spectra to be calculated. The idealized limit of a well-ordered array of magnetic and charged stripes is analyzed, including effects of long-range Coulomb repulsion. Remarkably, down to the limit of two-cell wide stripes, the dispersion can be interpreted as essentially a superposition of the two end-phase dispersions, with superposed minigaps associated with the lattice periodicity. The largest minigap falls near the Fermi level; it can be enhanced by proximity to a (bulk) Van Hove singularity. The calculated spectra are …
Emergence Of Non-Fermi-Liquid Behavior Due To Fermi Surface Reconstruction In The Underdoped Cuprate Superconductors, Tanmoy Das, R. S. Markiewicz, A. Bansil
Emergence Of Non-Fermi-Liquid Behavior Due To Fermi Surface Reconstruction In The Underdoped Cuprate Superconductors, Tanmoy Das, R. S. Markiewicz, A. Bansil
Robert Markiewicz
We present an intermediate coupling scenario together with a model analytic solution where the non-Fermi-liquid behavior in the underdoped cuprates emerges through the mechanism of Fermi surface (FS) reconstruction. Even though the fluctuation spectrum remains nearly isotropic, FS reconstruction driven by a density wave order breaks the lattice symmetry and induces a strong momentum dependence in the self-energy. As the doping is reduced to half-filling, we find that quasiparticle (QP) dispersion becomes essentially unrenormalized, but in sharp contrast the QP spectral weight renormalizes to nearly zero. This opposite doping evolution of the renormalization factors for QP dispersion and spectral weight …
Dispersion Anomalies Induced By The Low-Energy Plasmon In The Cuprates, R. S. Markiewicz, A. Bansil
Dispersion Anomalies Induced By The Low-Energy Plasmon In The Cuprates, R. S. Markiewicz, A. Bansil
Robert Markiewicz
We discuss the characteristic effects of the electron plasmon interaction resulting from the ~ 1 eV plasmon, which is a universal feature in the cuprates. Using the framework of a one-band tight binding model, we identify signatures of this low energy plasmon in the electronic structure of metallic overdoped Bi₂212 as well as half-filled insulating SCOC. The electron-plasmon interaction is found to yield renormalizations near the Fermi energy in reasonable accord with experimental observations, and to produce dispersion anomalies at higher energies.
Anomalous Scattering Rate And Microwave Absorption In Bi₂Sr₂Cacu₂O₈₊Δ And Y Ba₂Cu₃O₇₋Δ, C. Kusko, Z. Zhai, R. S. Markiewicz, S. Sridhar
Anomalous Scattering Rate And Microwave Absorption In Bi₂Sr₂Cacu₂O₈₊Δ And Y Ba₂Cu₃O₇₋Δ, C. Kusko, Z. Zhai, R. S. Markiewicz, S. Sridhar
Robert Markiewicz
We determine the scattering rate from microwave measurements for an optimally doped Bi-2212 single crystal, using a simple two fluid model with a d-wave symmetry order parameter. In the superconducting state, the calculated scattering rate is three orders of magnitude smaller than that determined from ARPES experiments. A similar anomalously large decrease in the scattering rate is also required to explain the data within a gap-quasiparticle scenario for other HTS, such as Y Ba₂Cu₃O₇₋δ. The results suggest that the assumption of normal excitations vanishing at low T is invalid and an additional charge mode is responsible for the microwave absorption.
Competing Order Scenario Of Two-Gap Behavior In Hole-Doped Cuprates, Tanmoy Das, R. S. Markiewicz, A. Bansil
Competing Order Scenario Of Two-Gap Behavior In Hole-Doped Cuprates, Tanmoy Das, R. S. Markiewicz, A. Bansil
Robert Markiewicz
Angle-dependent studies of the gap function provide evidence for the coexistence of two distinct gaps in hole doped cuprates, where the gap near the nodal direction scales with the superconducting transition temperature Tc, while that in the antinodal direction scales with the pseudogap temperature. We present model calculations which show that most of the characteristic features observed in the recent angle-resolved photoemission spectroscopy (ARPES) as well as scanning tunneling microscopy (STM) two-gap studies are consistent with a scenario in which the pseudogap has a non-superconducting origin in a competing phase. Our analysis indicates that, near optimal doping, superconductivity can quench …
Chaos In A Jahn-Teller Molecule, R. S. Markiewicz
Chaos In A Jahn-Teller Molecule, R. S. Markiewicz
Robert Markiewicz
The Jahn-Teller system E ⊗ b1 ⊗ b2 has a particular degeneracy, where the vibronic potential has an elliptical minimum. In the general case where the ellipse does not reduce to a circle, the classical motion in the potential is chaotic, tending to trapping near one of the extrema of the ellipse. In the quantum problem, the motion consists of correlated tunneling from one extremum to the opposite, leading to an average angular momentum reminiscent of that of the better known E ⊗ e dynamic Jahn-Teller system.
Contrasting Pathways To Mott Gap Collapse In Electron And Hole Doped Cuprates, R. S. Markiewicz
Contrasting Pathways To Mott Gap Collapse In Electron And Hole Doped Cuprates, R. S. Markiewicz
Robert Markiewicz
Recent ARPES measurements on the electron-doped cuprate Nd₂₋ₓCeₓCuO₄ can be interpreted in a mean field model of uniform doping of an antiferromagnet, with the Mott gap closing near optimal doping. Mode coupling calculations confirm the mean field results, while clarifying the relation between the Mott gap and shortrange magnetic order. The same calculations find that hole doped cuprates should follow a strikingly different doping dependence, involving instability toward spiral phases or stripes. Nevertheless, the magnetic order (now associated with stripes) again collapses near optimal doping.
A Survey Of The Van Hove Scenario For High-TC Superconductivity With Special Emphasis On Pseudogaps And Striped Phases, R S. Markiewicz
A Survey Of The Van Hove Scenario For High-TC Superconductivity With Special Emphasis On Pseudogaps And Striped Phases, R S. Markiewicz
Robert Markiewicz
The Van Hove singularity (VHS) provides a paradigm for the study of the role of peaks in the density of states (dos) on electronic properties. More importantly, it appears to play a major role in the physics of the high-Tc superconductors, particularly since recent photoemission studies have found that the VHS is close to the Fermi level in most of the high-Tc cuprates near the composition of optimum Tc. This paper offers a comprehensive survey of the VHS model, describing both theoretical properties and experimental evidence for the picture. Special topics discussed include a survey of the Fermi surfaces of …
Bridging K- And Q- Space In The Cuprates: Comparing Arpes And Stm Results, R. S. Markiewicz
Bridging K- And Q- Space In The Cuprates: Comparing Arpes And Stm Results, R. S. Markiewicz
Robert Markiewicz
No abstract provided.
Berryonic Matter In The Cuprates, R. S. Markiewicz
Berryonic Matter In The Cuprates, R. S. Markiewicz
Robert Markiewicz
A novel form of Jahn-Teller (JT) effect in the cuprates can be reinterpreted as a conventional JT effect on a lattice with a larger unit cell. There is a triplet of instabilities, parametrized by a pseudospin, consisting of a form of the low-temperature tetragonal phase, a charge density wave phase, and a flux phase (orbital antiferromagnet). On a single 4-Cu plaquette, the problem is of E ⊗ (b1 + b2) form. For a special choice of parameters, the model supports a dynamic JT effect, but is classically chaotic. The connection of this phase with Berryonic matter is discussed.