Phase diagram of the Su-Schrieffer-Heeger-Hubbard model on a square lattice

Article Materials Science, Multidisciplinary

Robustness of antiferromagnetism in the Su-Schrieffer-Heeger Hubbard model

Xun Cai et al.

Summary: This article investigates the Su-Schrieffer-Heeger-Hubbard model and shows that Hubbard interactions can further enhance EPC-induced AFM effects, especially for small phonon frequencies or in adiabatic limit.

PHYSICAL REVIEW B (2022)

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Article Materials Science, Multidisciplinary

Valence-bond solid to antiferromagnet transition in the two-dimensional Su-Schrieffer-Heeger model by Langevin dynamics

A. Goetz et al.

Summary: The two-dimensional Su-Schrieffer-Heeger model with electron-phonon coupling is investigated using Langevin dynamics and auxiliary-field quantum Monte Carlo. The efficient method in the challenging adiabatic limit is argued based on an explicit determination of the density of zeros of the fermion determinant. Large-scale simulations establish a transition from a (pi, pi) valence bond solid to an antiferromagnet as the phonon frequency increases. The single-particle spectrum shows renormalization and suggests the presence of a gapped polaronic band, while the particle-hole channels show gapless modes associated with long-range bond and magnetic order.

PHYSICAL REVIEW B (2022)

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Article Materials Science, Multidisciplinary

Bond bipolarons: Sign-free Monte Carlo approach

Chao Zhang et al.

Summary: This study investigates polarons originating from phonon displacement modulated hopping and their potential as candidates for the bipolaron mechanism of high-temperature superconductivity. The study finds that, under certain coupling conditions, the bond model can be efficiently solved using sign-free Monte Carlo methods based on the path-integral formulation, and the presence of s-wave superconductivity is observed.

PHYSICAL REVIEW B (2022)

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Article Physics, Multidisciplinary

Quantum Monte Carlo Simulations of the 2D Su-Schrieffer-Heeger Model

Bo Xing et al.

Summary: A new generation of quantum simulations has expanded our understanding of charge density wave phase transitions. The SSH Hamiltonian describes a scenario where phonons exist on bonds and modulate electron hopping. Results for the 2D SSH model show the presence of a bond ordered wave insulator at half filling, with a critical value of electron-phonon coupling required for its onset.

PHYSICAL REVIEW LETTERS (2021)

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Article Physics, Multidisciplinary

Antiferromagnetism Induced by Bond Su-Schrieffer-Heeger Electron-Phonon Coupling: A Quantum Monte Carlo Study

Xun Cai et al.

Summary: The study demonstrates that SSH phonons can induce AFM ordering in two-dimensional systems, and also reveals a direct quantum phase transition between VBS order and AFM phase. The phonon mechanism of AFM ordering is attributed to SSH phonons directly coupling to electron hopping processes.

PHYSICAL REVIEW LETTERS (2021)

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Review Physics, Multidisciplinary

Coherent and dissipative dynamics at quantum phase transitions

Davide Rossini et al.

Summary: This review discusses the many-body physics at quantum phase transitions, covering both equilibrium and out-of-equilibrium behaviors as well as effects of dissipative interactions. Different types of transitions exhibit distinct scaling behaviors, with the peculiar feature of extreme sensitivity to boundary conditions at first-order quantum transitions.

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS (2021)

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Article Materials Science, Multidisciplinary

Superconductivity, charge density waves, and bipolarons in the Holstein model

B. Nosarzewski et al.

Summary: A study on the two-dimensional electron-phonon coupling in the Holstein model explores CDW correlations, competition between superconducting and CDW orders, and polaron formation. It was found that superconductivity is optimized at intermediate e-ph coupling strength and intermediate electron density.

PHYSICAL REVIEW B (2021)

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Article Materials Science, Multidisciplinary

Superconductivity and charge density wave order in the two-dimensional Holstein model

Owen Bradley et al.

Summary: The Holstein Hamiltonian describes fermions interacting with phonons on a lattice. It predicts the behavior of dressed quasiparticles and the formation of superconducting and charge density wave phases at different densities. Quantum Monte Carlo calculations have been used to determine critical temperatures for these phase transitions in various lattice geometries.

PHYSICAL REVIEW B (2021)

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Article Materials Science, Multidisciplinary

Local moments versus itinerant antiferromagnetism: Magnetic phase diagram and spectral properties of the anisotropic square lattice Hubbard model

Marcin Raczkowski et al.

Summary: Utilizing a cluster extension of dynamical mean-field theory (CDMFT), the magnetic phase diagram of anisotropic square lattice Hubbard model at half filling was mapped out, showing different metal-insulator transitions in various regions of the phase diagram.

PHYSICAL REVIEW B (2021)

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Article Materials Science, Multidisciplinary

Charge density wave and superconductivity in the disordered Holstein model

B. Xiao et al.

Summary: Studies have found that the suppression of charge density wave correlations in the half-filled Holstein model by disorder can stabilize a superconducting phase. Experimental results demonstrate the inhibition of charge ordered phases and the emergence of superconductivity.

PHYSICAL REVIEW B (2021)

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Article Physics, Multidisciplinary