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Hinge non-Hermitian skin effect in the single-particle properties of a strongly correlated f-electron system
Robert Peters, Tsuneya Yoshida
Non-Hermitian systems exhibit novel phenomena without Hermitian counterparts, such as exceptional points and the non-Hermitian skin effect. These non-Hermitian topological phenomen…
Non-Hermitian Mott Skin Effect
Tsuneya Yoshida, Song-Bo Zhang, Titus Neupert +1
We propose a novel type of skin effects in non-Hermitian quantum many-body systems which we dub a non-Hermitian Mott skin effect. This phenomenon is induced by the interplay betwee…
Interaction-induced Liouvillian skin effect in a fermionic chain with a two-body loss
Shu Hamanaka, Kazuki Yamamoto, Tsuneya Yoshida
Despite recent intensive research on topological aspects of open quantum systems, effects of strong interactions have not been sufficiently explored. In this paper, we demonstrate…
Non-Hermitian skin effect in equilibrium heavy-fermions
Shin Kaneshiro, Tsuneya Yoshida, Robert Peters
We demonstrate that a correlated equilibrium -electron system with time-reversal symmetry can exhibit a non-Hermitian skin effect of quasi-particles. In particula…
Surface exceptional points in a topological Kondo insulator
Robert Peters, Kazuhiro Kimura, Yoshihiro Michishita +2
Correlated materials have appeared as an arena to study non-Hermitian effects as typically exemplified by the emergence of exceptional points. We show here that topological Kondo i…
Dynamics governed by symmetry-protected exceptional rings for mechanical systems
Gen Najima, Tsuneya Yoshida, Yasuhiro Hatsugai
Non-Hermitian topological phenomena occur in mechanical systems described by the Newton equation. A mechanical graphene, which is composed of mass points and springs, shows symmetr…
Correlation effects on non-Hermitian point-gap topology in zero dimension: reduction of topological classification
Tsuneya Yoshida, Yasuhiro Hatsugai
We analyze a zero-dimensional correlated system with special emphasis on the non-Hermitian point-gap topology protected by chiral symmetry. Our analysis elucidates that correlation…
Higher-Order Topological Mott Insulator on the Pyrochlore Lattice
Yuichi Otsuka, Tsuneya Yoshida, Koji Kudo +2
We provide the first unbiased evidence for a higher-order topological Mott insulator in three dimensions by numerically exact quantum Monte Carlo simulations. This insulating phase…
R-DMFT study of a non-Hermitian skin effect for correlated systems: analysis based on a pseudo-spectrum
Tsuneya Yoshida
We analyze a correlated system in equilibrium with special emphasis on non-Hermitian topology inducing a skin effect. The pseudo-spectrum, computed by the real-space dynamical mean…
Exceptional points in the one-dimensional Hubbard model
Roman Rausch, Robert Peters, Tsuneya Yoshida
Non-Hermitian phenomena offer a novel approach to analyze and interpret spectra in the presence of interactions. Using the density-matrix renormalization group (DMRG), we demonstra…
Exceptional band touching for strongly correlated systems in equilibrium
Tsuneya Yoshida, Robert Peters, Norio Kawakami +1
Quasi-particles described by Green's functions of equilibrium systems exhibit non-Hermitian topological phenomena because of their finite lifetime. This non-Hermitian perspective o…
Non-Hermitian topological Mott insulators in one-dimensional fermionic superlattices
Tao Liu, James Jun He, Tsuneya Yoshida +2
We study interaction-induced Mott insulators, and their topological properties in a 1D non-Hermitian strongly-correlated spinful fermionic superlattice system with either nonrecipr…
Reflection-Symmetry Protected Antiferromagnetic Topological Insulator in Three-Dimensional Heavy-Fermion Systems
Kazuhiro Kimura, Tsuneya Yoshida, Norio Kawakami
We study the topological properties of an antiferromagnetic phase with reflection symmetry in three-dimensional heavy-fermion systems. We here propose a reflection-symmetric topolo…
Relation between exceptional points and the Kondo effect in -electron materials
Yoshihiro Michishita, Tsuneya Yoshida, Robert Peters
We study the impact of nonhermiticity due to strong correlations in f-electron materials. One of the most remarkable phenomena occurring in nonhermitian systems is the emergence of…
Chiral-symmetry protected exceptional torus in correlated nodal-line semi-metals
Kazuhiro Kimura, Tsuneya Yoshida, Norio Kawakami
We analyze a diamond-lattice Hubbard model with the spatially modulated Hubbard interaction. Our dynamical mean-field analysis with special emphasis on non-Hermitian properties elu…
Higher-order Topological Mott Insulators
Koji Kudo, Tsuneya Yoshida, Yasuhiro Hatsugai
We propose a new correlated topological state which we call a higher-order topological Mott insulator (HOTMI). This state exhibits a striking bulk-boundary correspondence due to el…
Quantum oscillations in strongly correlated topological Kondo insulators
Robert Peters, Tsuneya Yoshida, Norio Kawakami
The observation of quantum oscillations in topological Kondo insulators SmB6 and YbB12 is a recent puzzling experimental discovery. Quantum oscillations observed in the resistivity…
Exceptional rings in two-dimensional correlated systems with chiral symmetry
Tsuneya Yoshida, Robert Peters, Norio Kawakami +1
Emergence of exceptional points in two dimensions is one of the remarkable phenomena in non-Hermitian systems. We here elucidate the impacts of symmetry on the non-Hermitian physic…
Efficient method to compute -indices with glide symmetry and applications to Möbius materials, and
Tsuneya Yoshida, Akito Daido, Norio Kawakami +1
We propose an efficient method to numerically evaluate -indices of Möbius/hourglass topological phases with glide symmetry. Our method directly provides $\mathbb{Z}_4…
Non-Hermitian perspective of the band structure in heavy-fermion systems
Tsuneya Yoshida, Robert Peters, Norio Kawakami
We analyze a two-dimensional Kondo lattice model with special emphasis on non-Hermitian properties of the single-particle spectrum, following a recent proposal by Kozii and Fu. Our…
Magnetic states in a three-dimensional topological Kondo insulator
Robert Peters, Tsuneya Yoshida, Norio Kawakami
We theoretically study the magnetic phase diagram of a three-dimensional topological Kondo insulator by means of real-space dynamical mean field theory. We find that ferromagnetica…
Topological properties of magnetically ordered heavy-fermion systems in the presence of mirror symmetry
Kazuhiro Kimura, Tsuneya Yoshida, Norio Kawakami
We explore topological states with magnetic order in heavy-fermion systems by taking account of a mirror symmetry.Although without spatial symmetry, there is no topological phase i…
Breakdown of topological Thouless pumping in the strongly interacting regime
Masaya Nakagawa, Tsuneya Yoshida, Robert Peters +1
We elucidate the mechanism for instability of topological Thouless pumping in strongly interacting systems from a viewpoint of symmetry-protected topological phases. If the protect…
Reduction of topological classification in cold atomic systems
Tsuneya Yoshida, Ippei Danshita, Robert Peters +1
One of the most challenging problems in correlated topological systems is a realization of the reduction of topological classification, but very few experimental platforms have bee…