713 citations · 6.9k across the 81 of their papers we have counts for
26 papers · 1 filter
Gap labeling theorem for multilayer thin film heterostructures
Mao Yoshii, Sota Kitamura, Takahiro Morimoto
Quasiperiodic systems show a universal gap structure due to quasiperiodicity which is analogous to gap openings at the Brillouin zone boundary in periodic systems. The integrated d…
Nonlinear spin current of photoexcited magnons in collinear antiferromagnets
Kosuke Fujiwara, Sota Kitamura, Takahiro Morimoto
We study the nonlinear magnon spin current induced by an ac electric field under light irradiation in collinear antiferromagnets with broken inversion symmetry. For linearly polari…
Thermal Hall responses in frustrated honeycomb spin systems
Kosuke Fujiwara, Sota Kitamura, Takahiro Morimoto
We study geometrical responses of magnons driven by a temperature gradient in frustrated spin systems. While Dzyaloshinskii-Moriya (DM) interactions are usually incorporated to obt…
Photovoltaic effect by soft phonon excitation
Yoshihiro Okamura, Takahiro Morimoto, Naoki Ogawa +7
Photodetection is an indispensable function of optoelectronic devices in modern communication and sensing systems. Contrary to the near-infrared/visible regions, the fast and sensi…
Optical response of the Leggett mode in multiband superconductors in the linear response regime
Takumi Kamatani, Sota Kitamura, Naoto Tsuji +2
We study optical responses of Leggett modes in multiband superconductors in the linear response regime. The Leggett mode is a collective mode unique to multiband superconductors th…
Electrical conductivity in helical and conical magnetic states
Shun Okumura, Takahiro Morimoto, Yasuyuki Kato +1
We theoretically study the electrical conductivity in a one-dimensional helimagnet whose spin texture changes from helimagnetic to conical magnetic, and to forced ferromagnetic sta…
Quadratic Optical Responses in a Chiral Magnet
Shun Okumura, Takahiro Morimoto, Yasuyuki Kato +1
Chiral magnets, which break both spatial inversion and time reversal symmetries, carry a potential for quadratic optical responses. Despite the possibility of enhanced and controll…
Electric polarization and nonlinear optical effects in noncentrosymmetric magnets
Takahiro Morimoto, Sota Kitamura, Shun Okumura
We study electric polarization and nonlinear optical effects in spin systems with broken inversion symmetry. We apply strong coupling expansion to the underlying electronic Hamilto…
Current response of nonequilibrium steady states in Landau-Zener problem: Nonequilibrium Green's function approach
Sota Kitamura, Naoto Nagaosa, Takahiro Morimoto
The carrier generation in insulators subjected to strong electric fields is characterized by the Landau-Zener formula for the tunneling probability with a nonperturbative exponent.…
Shift current from electromagnon excitations in multiferroics
Takahiro Morimoto, Naoto Nagaosa
Electromagnon is the spin wave in multiferroic materials and is known to accompany electric polarization due to the cross correlation between the charge and spin. Here, we theoreti…
Biexciton in one-dimensional Mott insulators
T. Miyamoto, T. Kakizaki, T. Terashige +10
Mott insulators sometimes show dramatic changes in their electronic states after photoirradiation, as indicated by photoinduced Mott-insulator-to-metal transition. In the photoexci…
Quantum phase transitions beyond Landau-Ginzburg theory in one-dimensional space revisited
Christopher Mudry, Akira Furusaki, Takahiro Morimoto +1
The phase diagram of the quantum spin-1/2 antiferromagnetic - XXZ chain was obtained by Haldane using bosonization techniques. It supports three distinct ph…
Diagrammatic approach to nonlinear optical response with application to Weyl semimetals
Daniel E. Parker, Takahiro Morimoto, Joseph Orenstein +1
Nonlinear optical responses are a crucial probe of physical systems including periodic solids. In the absence of electron-electron interactions, they are calculable with standard p…
Symmetry protected topological phases in two-orbital SU(4) fermionic atoms
Hiroshi Ueda, Takahiro Morimoto, Tsutomu Momoi
We study one-dimensional systems of two-orbital SU(4) fermionic cold atoms. In particular, we focus on an SU(4) spin model [named SU(4) - spin model] that is realized in a lo…
Nonreciprocal current from electron interactions in noncentrosymmetric crystals: roles of time reversal symmetry and dissipation
Takahiro Morimoto, Naoto Nagaosa
In noncentrosymmetric crystals with broken inversion symmetry , the (: current, : voltage) characteristic is generally expected to depend on the direction…
Floquet topological phases protected by time glide symmetry
Takahiro Morimoto, Hoi Chun Po, Ashvin Vishwanath
We study Floquet topological phases in periodically driven systems that are protected by "time glide symmetry", a combination of reflection and half time period translation. Time g…
Dynamically enriched topological orders in driven two-dimensional systems
Andrew C. Potter, Takahiro Morimoto
Time-periodic driving of a quantum system can enable new dynamical topological phases of matter that could not exist in thermal equilibrium. We investigate two related classes of d…
Quantized circular photogalvanic effect in Weyl semimetals
Fernando de Juan, Adolfo G. Grushin, Takahiro Morimoto +1
The circular photogalvanic effect (CPGE) is the part of a photocurrent that switches depending on the sense of circular polarization of the incident light. It has been consistently…
Classification of Interacting Topological Floquet Phases in One Dimension
Andrew C. Potter, Takahiro Morimoto, Ashvin Vishwanath
Periodic driving of a quantum system can enable new topological phases with no analog in static systems. In this paper we systematically classify one-dimensional topological and sy…
Bosonic symmetry protected topological phases with reflection symmetry
Tsuneya Yoshida, Takahiro Morimoto, Akira Furusaki
We study two-dimensional bosonic symmetry protected topological (SPT) phases which are protected by reflection symmetry and local symmetry [, , U(1)$\rti…
Weyl Mott Insulator
Takahiro Morimoto, Naoto Nagaosa
Relativistic Weyl fermion (WF) often appears in the band structure of three dimensional magnetic materials and acts as a source or sink of the Berry curvature, i.e., the (anti-)mon…
Breakdown of the topological classification Z for gapped phases of noninteracting fermions by quartic interactions
Takahiro Morimoto, Akira Furusaki, Christopher Mudry
The conditions for both the stability and the breakdown of the topological classification of gapped ground states of noninteracting fermions, the tenfold way, in the presence of qu…
Topological Phases Protected By Reflection Symmetry and Cross-cap States
Gil Young Cho, Chang-Tse Hsieh, Takahiro Morimoto +1
Twisting symmetries provides an efficient method to diagnose symmetry-protected topological (SPT) phases. In this paper, edge theories of (2+1)-dimensional topological phases prote…
Z_3 symmetry-protected topological phases in the SU(3) AKLT model
Takahiro Morimoto, Hiroshi Ueda, Tsutomu Momoi +1
We study symmetry-protected topological (SPT) phases in one-dimensional spin systems with symmetry. We construct ground-state wave functions of the…