Article
Materials Science, Multidisciplinary
Pascal Strobel, Maria Daghofer
Summary: In this paper, the possibility of Floquet engineering in three candidate Kitaev materials is examined. The authors derive an effective Floquet Hamiltonian and approximate the heating processes arising from doublon holon propagation. The impacts of light frequency and amplitude on magnetic interaction terms are investigated, and the uses of linear polarized light in selectively tuning single bond directions are discussed.
Article
Materials Science, Multidisciplinary
Sparsh Mishra, Shun Tamura, Akito Kobayashi, Yukio Tanaka
Summary: The study reveals that the spatial distribution of the local density of states and the odd-frequency spin-triplet s-wave pair amplitude can be tuned when the impurity is positioned close to the edge. Additionally, the zero-energy local density of states and low-frequency odd-frequency pair amplitude exhibit the same spatial dependence.
Article
Materials Science, Multidisciplinary
Aman Kumar, Vikram Tripathi
Summary: We investigate the thermal Hall conductivity k(xy) in a J-K Kitaev-Heisenberg model with a Zeeman field in the (111) direction, to understand the relationship between the possible reemergence of Ising topological order (ITO) and the half-quantized K-xy/T upon field suppression of long-range magnetic order in Kitaev materials. We use a purification-based finite-temperature tensor network approach without assuming the nature of the excitations: Majorana, visons, or spin waves. Our results show that the half-quantized thermal Hall effect near field-suppressed magnetic order is a fine-tuning effect and is not associated with a Majorana Hall state with ITO.
Article
Physics, Multidisciplinary
Ayushi Singhania, Jeroen van den Brink, Satoshi Nishimoto
Summary: This study investigates the interplay of disorder and Heisenberg interactions in the Kitaev model on a honeycomb lattice. The effects of disorder on the transition between Kitaev spin liquid and magnetic ordered states as well as the stability of magnetic ordering are examined. The results show that disorder reduces the range of spin-liquid phases and changes the transitions to magnetic ordered phases to a more crossoverlike behavior. In addition, long-range orderings in the clean system are replaced by domains with different ordering directions.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Sudip Kumar Saha, Manodip Routh, Manoranjan Kumar, Zoltan G. Soos
Summary: The study of the antiferromagnetic J(1) - J(2) model involves extensive research and calculations, revealing the relationship between different thermodynamic properties and the thermodynamic results for specific parameters.
Article
Materials Science, Multidisciplinary
Shaozhi Li, Satoshi Okamoto
Summary: Motivated by the giant phonon anomalies in alpha-RuCl3, this study investigates the thermal Hall effect in a Kitaev-Heisenberg system with spin-phonon coupling. The results show that the coupling has different effects on the thermal Hall conductivity in different magnetically ordered states. For alpha-RuCl3, it enhances the magnon excitation gap and suppresses the thermal Hall conductivity, while for the Kitaev spin liquid state, it reduces the excitation gap of Majorana fermions and destabilizes the quantized thermal Hall effect.
Article
Materials Science, Multidisciplinary
Philip M. Dee, Benjamin Cohen-Stead, Steven Johnston, P. J. Hirschfeld
Summary: In a recent study, Schrodi et al. discovered an unconventional superconducting state with a sign-changing order parameter using the Migdal-Eliashberg theory. They found this unconventional solution despite using an isotropic bare electron-phonon coupling in the Hamiltonian. However, our Monte Carlo simulations on a similar model suggest that unconventional pairing correlations do not exceed their noninteracting values at any carrier concentration we have checked. Instead, strong charge-density-wave correlations persist at the lowest accessible temperatures.
Article
Materials Science, Multidisciplinary
Shreya Das, Sreekar Voleti, Tanusri Saha-Dasgupta, Arun Paramekanti
Summary: The study of three rhombohedral honeycomb cobaltates reveals different spin models and ground states, indicating the possibility of realizing exotic physics in materials with strong spin-orbit coupling.
Article
Physics, Multidisciplinary
Kota Katsumi, Alexandr Alekhin, Sofia-Michaela Souliou, Michael Merz, Amir-Abbas Haghighirad, Matthieu Le Tacon, Sarah Houver, Maximilien Cazayous, Alain Sacuto, Yann Gallais
Summary: In this study, the nonequilibrium photoexcited state of Ta2NiSe5 was investigated using pump-probe Raman and photoluminescence spectroscopies. The combined spectroscopic measurements of the lattice and electronic states revealed the presence of a photoexcited metastable state where the insulating gap is suppressed, but the low-temperature structural distortion is preserved. It was concluded that electron correlations play a vital role in the semiconductor-to-insulator transition of Ta2NiSe5.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Moumita Deb, Asim Kumar Ghosh
Summary: Various topological phases have been observed in the ferromagnetic Kitaev-Heisenberg model on the CaVO lattice in the presence of the Dzyaloshinskii-Moriya interaction. The study includes evaluation of band structures, dispersion relations, density of states, and thermal Hall conductance for each phase, as well as the construction of an extensive phase diagram and investigation of topological phase transitions in parameter space.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Physics, Multidisciplinary
Xianxin Wu, Tilman Schwemmer, Tobias Mueller, Armando Consiglio, Giorgio Sangiovanni, Domenico Di Sante, Yasir Iqbal, Werner Hanke, Andreas P. Schnyder, M. Michael Denner, Mark H. Fischer, Titus Neupert, Ronny Thomale
Summary: The recent discovery of AV(3)Sb(5) has revealed an intriguing arena for exotic Fermi surface instabilities in a kagome metal, with superconductivity near multiple van Hove singularities showing indications of unconventional pairing. The sublattice interference mechanism is crucial in understanding the formation of superconductivity in a kagome metal, with nonlocal Coulomb repulsion, the sublattice profile of the van Hove bands, and the interaction strength being crucial parameters determining the preferred pairing symmetry. Implications for potentially topological surface states are discussed, along with a proposal for additional measurements to determine the nature of superconductivity in AV(3)Sb(5).
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
T. Shang, Y. Chen, W. Xie, D. J. Gawryluk, R. Gupta, R. Khasanov, X. Y. Zhu, H. Zhang, Z. X. Zhen, B. C. Yu, Z. Zhou, Y. Xu, Q. F. Zhan, E. Pomjakushina, H. Q. Yuan, T. Shiroka
Summary: This study presents a comprehensive investigation of the microscopic superconducting properties of the CuIr2-xRuxTe4 superconductors. It reveals the existence of multigap superconductivity and a transition to more conventional superconductivity under applied pressure.
Article
Physics, Multidisciplinary
Umberto Borla, Ruben Verresen, Jeet Shah, Sergej Moroz
Summary: The study reveals the existence of fermion parity symmetry in the Kitaev chain, with gauge transformation leading to a topological order distinct from the Kitaev chain. The deconfined phase can remain stable even in the presence of vortices. Additionally, a comprehensive study of a model interpolating between ordinary and gauged Kitaev chains showcases rich quantum criticality.
Article
Astronomy & Astrophysics
Antonio M. Garcia-Garcia, Victor Godet
Summary: In this study, a two-site Sachdev-Ye-Kitaev (SYK) model with complex couplings is investigated, and a low temperature transition to a gapped phase characterized by a constant in temperature free energy is identified. A gravity interpretation of these results is proposed by constructing an explicit solution of Jackiw-Teitelboim gravity with matter, which involves a two-dimensional Euclidean wormhole with the geometry of a double trumpet. This transition from a disconnected phase with two black holes to the connected wormhole phase is observed as the temperature decreases, demonstrating how a Euclidean wormhole can arise from an average over field theory couplings.
Article
Materials Science, Multidisciplinary
Su-Ming Zhang, Zheng-Xin Liu
Summary: In extended Kitaev models on the honeycomb lattice, doping holes into the system results in a rich phase diagram of the t-K-Gamma-Gamma' model, showing the interplay between charge and spin degrees of freedom. Multiple superconducting and pseudogap phases are generated, with a Chern number of the topological superconductor being either v = +/- 2 or v = +/- 1. The presence of an intermediate in-plane magnetic field slightly enlarges the topological superconducting phase.
Article
Physics, Particles & Fields
Passant Ali, Astrid Eichhorn, Martin Pauly, Michael M. Scherer
Summary: The realization of global symmetries in quantum-gravity-matter-systems has significant phenomenological implications. Within an asymptotically safe context, it is suggested that discrete global symmetries of the form Z(n), n > 4, cannot be realized in a near-perturbative regime, while an effective-field-theory approach to quantum gravity may feature such symmetries and provide a mechanism for generating mass hierarchies in the infrared without additional fine-tuning.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Jan Attig, Jinhong Park, Michael M. Scherer, Simon Trebst, Alexander Altland, Achim Rosch
Summary: This paper explores the universal physical properties of moire materials using statistical principles, focusing on the Fermi surface flat bands in moire structures, and examines the competition outcomes in these systems.
Article
Multidisciplinary Sciences
Lede Xian, Martin Claassen, Dominik Kiese, Michael M. Scherer, Simon Trebst, Dante M. Kennes, Angel Rubio
Summary: The study reveals that twisted bilayer MoS2 can achieve a strongly asymmetric p(x)-p(y) Hubbard model with two almost entirely dispersionless bands due to destructive interference. The emergence of these dispersionless bands is similar to the flat bands in Lieb or Kagome lattices, and coexists with the general band flattening caused by moire interference.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Michael M. Scherer, Dante M. Kennes, Laura Classen
Summary: Experimental demonstrations of tunable correlation effects in magic-angle twisted bilayer graphene and other twisted two-dimensional materials have been achieved. By manipulating interaction, its range, and filling experimentally, we have investigated Fermi surface instabilities and resulting phases of matter in hetero-bilayer TMDs.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Multidisciplinary
Lennart Klebl, Ammon Fischer, Laura Classen, Michael M. Scherer, Dante M. Kennes
Summary: Evidence of correlated insulating and superconducting phases in tWSe2 was reported. A functional renormalization group approach was used to investigate their origin and interplay. The phase diagram as a function of filling and perpendicular electric field was mapped, revealing mixed-parity superconducting order parameters with s/f-wave and topological d/p-wave symmetry.
PHYSICAL REVIEW RESEARCH
(2023)
Proceedings Paper
Computer Science, Theory & Methods
Maniraman Periyasamy, Nico Meyer, Christian Ufrecht, Daniel D. Scherer, Axel Plinge, Christopher Mutschler
Summary: The representation of high dimensional data in quantum circuits is a challenge, and this study proposes a novel encoding pattern called "incremental data-uploading" that achieves a better data representation with minimal pre-processing requirements.
2022 IEEE INTERNATIONAL CONFERENCE ON QUANTUM COMPUTING AND ENGINEERING (QCE 2022)
(2022)
Article
Materials Science, Multidisciplinary
Nico Gneist, Laura Classen, Michael M. Scherer
Summary: This study investigates the interplay of strong electronic correlations and geometric frustration by studying the triangular lattice Hubbard model. Using a truncated-unity functional renormalization group approach, the competing instabilities of interacting electrons near a filling where the density of states has a Van Hove singularity are explored. The research reveals rich phase diagrams, including tendencies to spin-density-wave order and unconventional pairing, which can lead to topological superconductivity.
Article
Materials Science, Multidisciplinary
Igor F. Herbut, Michael M. Scherer
Summary: The article examines a (2+1)-dimensional Gross-Neveu-Yukawa field theory with eight-component Dirac fermions and two triplets of order parameters. By deriving a unitary transformation and analyzing the renormalization group flow of the coupling constants, the characteristics of multicritical behavior are studied.
Article
Materials Science, Multidisciplinary
Shouryya Ray, Bernhard Ihrig, Daniel Kruti, John A. Gracey, Michael M. Scherer, Lukas Janssen
Summary: This study characterizes the quantum critical behavior of the Gross-Neveu-SO(3) universality class using three complementary field-theoretical techniques, and obtains estimates for the correlation-length exponent, order-parameter anomalous dimension, and fermion anomalous dimension. The results are obtained by averaging over different techniques and the uncertainty displayed represents the degree of consistency among the methods.
Article
Physics, Multidisciplinary
Emilio Torres, Lukas Weber, Lukas Janssen, Stefan Wessel, Michael M. Scherer
PHYSICAL REVIEW RESEARCH
(2020)
Article
Physics, Multidisciplinary
Dominik Kiese, Finn Lasse Buessen, Ciaran Hickey, Simon Trebst, Michael M. Scherer
PHYSICAL REVIEW RESEARCH
(2020)
Article
Materials Science, Multidisciplinary
J. Ehrlich, C. Honerkamp
Article
Materials Science, Multidisciplinary
Laura Classen, Andrey Chubukov, Carsten Honerkamp, Michael M. Scherer
Article
Materials Science, Multidisciplinary
Lukas Janssen, Wei Wang, Michael M. Scherer, Zi Yang Meng, Xiao Yan Xu
Article
Physics, Multidisciplinary
Claudia Merger, Timo Reinartz, Stefan Wessel, Carsten Honerkamp, Andreas Schuppert, Moritz Helias
Summary: Networks with fat-tailed degree distributions often have hubs, nodes with high numbers of connections, crucial to the transition into a globally ordered network state. Higher order interaction effects counteract the self-feedback on hubs, highlighting their importance for the distinct onset of local versus global order in the network. This mechanism may be relevant for other systems with a strongly hierarchical underlying network structure.
PHYSICAL REVIEW RESEARCH
(2021)