Article
Physics, Multidisciplinary
Xinyang Dong, Emanuel Gull, Andrew J. Millis
Summary: This study investigates the contribution of electron-spin-fluctuation coupling to the superconducting state in a two-dimensional Hubbard model using the dynamical cluster approximation. The findings suggest that only about half of the superconductivity can be attributed to the pairing mechanism involving spin fluctuations as pairing bosons in the standard one-loop theory.
Article
Multidisciplinary Sciences
Zhuoyu Chen, Yao Wang, Slavko N. Rebec, Tao Jia, Makoto Hashimoto, Donghui Lu, Brian Moritz, Robert G. Moore, Thomas P. Devereaux, Zhi-Xun Shen
Summary: The synthesis and spectroscopic analysis of the 1D cuprate Ba2-xSrxCuO3+delta over a wide range of hole doping was reported. Angle-resolved photoemission experiments revealed the doping evolution of the holon and spinon branches. An additional strong near-neighbor attraction, possibly arising from coupling to phonons, quantitatively explained the experiments for all accessible doping levels. Consideration of structural and quantum chemistry similarities among cuprates suggests that this attraction may also play a crucial role in high-temperature cuprate superconductors.
Article
Materials Science, Multidisciplinary
Wenliang Zhang, Clio Efthimia Agrapidis, Yi Tseng, Teguh Citra Asmara, Eugenio Paris, Vladimir N. Strocov, Enrico Giannini, Satoshi Nishimoto, Krzysztof Wohlfeld, Thorsten Schmitt
Summary: This study investigates the evolution of spin excitations in hole-doped superconducting cuprates and confirms the close connection between spin excitations and short-range magnetic correlations.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Multidisciplinary
Cecile Carcy, Gaetan Herce, Antoine Tenart, Tommaso Roscilde, David Clement
Summary: This study provides a joint experimental and theoretical analysis on the adiabatic preparation of ultracold bosons in optical lattices to simulate the three-dimensional Bose-Hubbard model. The measured temperatures are in agreement with theoretical calculations, demonstrating that equilibrium states of the model can be adiabatically prepared in cold-atom apparatus. The Fisher information associated with the thermometry method is most accurate in the critical regime close to the Mott transition, as confirmed in the experiment.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Jake Ayres, Mikhail I. Katsnelson, Nigel E. Hussey
Summary: This paragraph discusses the influence of the pseudogap on superconductivity in hole-doped cuprates, and proposes an explanation for the relationship between superconducting state and pseudogap.
FRONTIERS IN PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Julian Stobbe, Georg Rohringer
Summary: In this study, a new method is proposed to overcome the ambiguity in the calculation of potential energy in dynamical mean-field theory (DMFT). The method introduces an effective mass renormalization parameter and provides satisfactory results in application to a three-dimensional lattice. The method also restores the hierarchy of kinetic energies in the weak coupling regime.
Article
Multidisciplinary Sciences
I. Hase, Y. Higashi, H. Eisaki, K. Kawashima
Summary: In this study, first-principles calculations were performed on the pyrochlore oxide Pb2Sb2O7, and it was theoretically clarified that the self-doping mechanism induces the pinning of the Fermi level within the flat band, resulting in a very high density of states and a transformation of the ferromagnetic state into the ground state via a flat band mechanism, despite the absence of magnetic elements in the system. This compound has the potential to serve as a new platform for projecting the properties of flat band systems in the real world.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Elham Sadeghi, Hamed Rezania
Summary: In this study, the transport properties of a two-dimensional Lieb lattice in the presence of magnetic field and spin-orbit coupling were investigated. The results showed that the increase of spin-orbit coupling led to a decrease in thermal conductivity, while the increase in temperature resulted in an increase in electrical and thermal conductivities. The temperature dependence of the Seebeck coefficient was also studied, revealing a positive thermopower in the presence of spin-orbit coupling.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Patrick Kappl, Friedrich Krien, Clemens Watzenboeck, Karsten Held
Summary: By calculating the three-particle response of the Anderson impurity model, we find that genuine three-particle vertex corrections are significant and cannot be neglected by only considering bare bubble terms or corrections based on the two-particle vertex.
Article
Materials Science, Multidisciplinary
Zhipeng Sun
Summary: The Fermi surface topology plays a crucial role in the study of high-temperature superconductivity cuprates. The conventional method for determining the Fermi surface is not always reliable due to its sensitivity to noise or precision issues. In this study, a simple and specific notion, the derivative of the momentum distribution function with respect to the chemical potential, is proposed as a reliable approach to determine the Fermi surface.
Article
Materials Science, Multidisciplinary
C. Gauvin-Ndiaye, P. -A. Graham, A. -M. S. Tremblay
Summary: In the 2D Hubbard model, a violation of the Vilk criterion near the antiferromagnetic quantum critical point can lead to a modification of the conditions for the appearance of hot spots when sufficient disorder is added.
Article
Multidisciplinary Sciences
M. Kiczynski, S. K. Gorman, H. Geng, M. B. Donnelly, Y. Chung, Y. He, J. G. Keizer, M. Y. Simmons
Summary: In this study, we demonstrate the realization of the topological and trivial phases of the many-body Su-Schrieffer-Heeger (SSH) model via precise placement of atoms in silicon and strong Coulomb confinement. By engineering all-epitaxial in-plane gates, we are able to tune the energy levels across a linear array of quantum dots to observe clear signatures of the topological phase with two conductance peaks.
Editorial Material
Multidisciplinary Sciences
Mandar M. Deshmukh
Summary: Solid-state systems designed to mimic quantum behavior of electrons in solids could potentially challenge established techniques that rely on exhaustive computations or precise control of atoms in dilute gases.
Article
Multidisciplinary Sciences
Fabian Jerzembeck, Henrik S. Roising, Alexander Steppke, Helge Rosner, Dmitry A. Sokolov, Naoki Kikugawa, Thomas Scaffidi, Steven H. Simon, Andrew P. Mackenzie, Clifford W. Hicks
Summary: Applying in-plane uniaxial pressure can dramatically change the electronic structure of strongly correlated low-dimensional systems, and using pressure along the c axis can provide even stronger control over the quasi-two-dimensional structure. In the superconductor Sr2RuO4, in-plane strain enhances Tc and Hc2, but the effect of out-of-plane strain has not been studied.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
O. Song-Jin, Yong-Hwan Kim, Ok-Gyong Pak, Kum-Hyok Jong, Chol-Won Ri, Hak-Chol Pak
Summary: Researchers investigated doped graphene near the van Hove singularity and discovered rich ground-state phase diagrams with various superconducting and spin/charge-density wave phases. Surprisingly, they found that weak nearest-neighbor exchange coupling strongly suppresses chiral d-wave superconductivity in this system.
Article
Physics, Condensed Matter
Elisabeth Wybo, Michael Knap, Frank Pollmann
Summary: The dynamics of entanglement in a Wannier-Stark many-body localized system coupled to a dephasing environment is investigated, using the third Renyi negativity as an accessible entanglement proxy. This measure captures the characteristic logarithmic growth of interacting localized phases up to intermediate time-scales, providing a tool to distinguish Wannier-Stark MBL from noninteracting Wannier-Stark localization and quantify quantum correlations in mixed-state dynamics.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Multidisciplinary Sciences
M. K. Joshi, F. Kranzl, A. Schuckert, I Lovas, C. Maier, R. Blatt, M. Knap, C. F. Roos
Summary: Identifying universal properties of nonequilibrium quantum states is a major challenge in modern physics. In this study, researchers experimentally observed a family of hydrodynamic universality classes in a long-range interacting spin chain system, ranging from normal diffusion to anomalous superdiffusion, and extracted the transport coefficients of the hydrodynamic theory, reflecting the microscopic properties of the system.
Article
Multidisciplinary Sciences
Sarah Hirthe, Thomas Chalopin, Dominik Bourgund, Petar Bojovic, Annabelle Bohrdt, Eugene Demler, Fabian Grusdt, Immanuel Bloch, Timon A. Hilker
Summary: In this study, the experimental method of quantum gas of ultracold atoms was used to observe hole pairing phenomenon caused by magnetic correlations in a doped antiferromagnetic ladder system with mixed-dimensional couplings. The results showed that magnetic correlations can significantly increase the binding energy of holes and reduce the pair size, allowing holes to predominantly occupy the same rung of the ladder. It was also found that spatial structures in the pair distribution appeared with increased doping, indicating repulsion between bound hole pairs. By engineering a configuration to enhance binding, a strategy to increase the critical temperature for superconductivity was outlined.
Article
Physics, Multidisciplinary
F. A. Palm, M. Kurttutan, A. Bohrdt, U. Schollwoeck, F. Grusdt
Summary: Strongly interacting fermionic systems can exhibit interesting quantum many-body states with exotic excitations. This study focuses on the interplay between strong interactions and the Pauli exclusion principle in the Hofstadter-Fermi-Hubbard model. The researchers discover a lattice analog of the quantum Hall ferromagnet at magnetic filling factor nu = 1, and observe spin-singlet states with spin-spin correlations similar to skyrmions. They also predict the breakdown of flat-band ferromagnetism at large fields. This work opens up possibilities for experimental studies of lattice QH ferromagnetism and its relation to high-Tc superconductivity.
NEW JOURNAL OF PHYSICS
(2023)
Article
Multidisciplinary Sciences
Muqing Xu, Lev Haldar Kendrick, Anant Kale, Youqi Gang, Geoffrey Ji, Richard T. T. Scalettar, Martin Lebrat, Markus Greiner
Summary: Geometrical frustration in strongly correlated systems can lead to the emergence of novel ordered states and magnetic phases, such as quantum spin liquids. This study investigates the effects of frustration and doping on the local spin order in a controllable Hubbard model. The results show that frustration reduces the range of magnetic correlations and induces a transition from a collinear Neel antiferromagnet to a short-range correlated 120 degrees spiral phase. The triangular lattice exhibits enhanced antiferromagnetic correlations on the hole-doped side and a reversal to ferromagnetic correlations at high particle dopings.
Article
Physics, Multidisciplinary
Henning Schloemer, Annabelle Bohrdt, Lode Pollet, Ulrich Schollwoeck, Fabian Grusdt
Summary: This study uses the density matrix renormalization group method at finite temperature to analyze the formation of stripes in the mixed-dimensional t-J model. It is found that a stable vertical stripe phase can be formed in the absence of pairing, exhibiting incommensurate magnetic order and long-range charge density wave profiles. The proposed model can be seen as a parent Hamiltonian of the stripe phase, and its hidden spin correlations contribute to the predicted resilience against quantum and thermal fluctuations.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Julius Dicke, Lukas Rammelmueller, Fabian Grusdt, Lode Pollet
Summary: We investigate the phase diagram of two different mixed-dimensional t-Jz-J1 models on the square lattice, with hopping amplitude t only nonzero along the x direction. In the first bosonic model, the spin-exchange amplitude J1 is negative and isotropic along the x and y directions, with isotropic and positive Jz. The low-energy physics is characterized by spin-charge separation. In the second model, J1 is restricted to the x axis while Jz remains isotropic and positive. The model exhibits stripe patterns with antiferromagnetic Neel order at low temperature and high hole densities.
Article
Materials Science, Multidisciplinary
Petar Cubela, Annabelle Bohrdt, Markus Greiner, Fabian Grusdt
Summary: It is unclear how effective low-energy degrees of freedom and the corresponding field theories emerge from microscopic models in doped antiferromagnets. This study demonstrates the existence of various long-lived excitations in a doped one-dimensional spin chain in a staggered magnetic field, including magnons, mesonic pairs, and tetraparton bound states. The introduction of a strong-coupling theory allows for the analysis of the polaronic dressing and molecular binding of mesons to collective magnon excitations. The experimental realization of this system can be achieved in quantum gas microscopes.
Article
Materials Science, Multidisciplinary
Haifeng Lang, Philipp Hauke, Johannes Knolle, Fabian Grusdt, Jad C. Halimeh
Summary: Disorder-free localization in translation-invariant gauge theories presents a counterintuitive yet powerful framework of ergodicity breaking in quantum many-body physics. Here, we introduce the concept of Stark gauge protection, which can stabilize or enhance disorder-free localization against gauge-breaking errors in U(1) and Z2 gauge theories up to all accessible evolution times.
Article
Physics, Multidisciplinary
Jad C. Halimeh, Lukas Homeier, Christian Schweizer, Monika Aidelsburger, Philipp Hauke, Fabian Grusdt
Summary: This article discusses the implementation of gauge invariance in lattice gauge theories in quantum synthetic matter. By using simplified local pseudogenerators, the authors successfully stabilize gauge invariance and reduce experimental overhead and complexity, enabling faithful simulations of exact gauge theories on polynomial and exponential time scales.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Anant Kale, Jakob Hendrik Huhn, Muqing Xu, Lev Haldar Kendrick, Martin Lebrat, Christie Chiu, Geoffrey Ji, Fabian Grusdt, Annabelle Bohrdt, Markus Greiner
Summary: In strongly interacting systems with a separation of energy scales, low-energy effective Hamiltonians provide insights into the physics at low temperatures. Virtual excitations mediate the interactions in the effective model, making it advantageous to consider the effective model for interpreting experimental results. By performing measurements in a rotated basis, quantum simulators allow more direct access to the effective model. A proposed protocol involving a linear ramp of the optical lattice depth enables the preparation of approximate t-J-3s model states by eliminating virtual excitations.
Article
Materials Science, Multidisciplinary
Julian Boesl, Rohit Dilip, Frank Pollmann, Michael Knap
Summary: In this study, we investigate the Bose-Hubbard model under an effective magnetic field and discover various gapped phases connected to quantum Hall states by using the density matrix renormalization group method. Through the calculation of Hall conductance and extraction of topological entanglement entropy, we identify features compatible with different topological orders and further analyze the entanglement spectrum of topological states at different interaction strengths.
Article
Materials Science, Multidisciplinary
Joaquin F. Rodriguez-Nieva, Alexander Schuckert, Dries Sels, Michael Knap, Eugene Demler
Summary: In this study, we analyze the intrinsic stability of spin spiral states in the two-dimensional Heisenberg model. We find that the SU(2) symmetric point exhibits a dynamic instability caused by energetically favorable transverse deformations in both real and spin space of the spiral order. This instability is universal and applies to systems with any spin number, spiral wave vector, and spiral amplitude. Unlike traditional Landau or modulational instabilities, this instability can be triggered solely by quantum fluctuations. By introducing an easy-plane exchange coupling, we show that the stability boundary continuously interpolates between the modulational instability and the transverse instability.
