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Symmetry-adapted variational quantum eigensolver
Kazuhiro Seki, Tomonori Shirakawa, Seiji Yunoki
We propose a scheme to restore spatial symmetry of Hamiltonian in the variational-quantum-eigensolver (VQE) algorithm for which the quantum circuit structures used usually break th…
Thermodynamic properties of an ring-exchange model on the triangular lattice
Kazuhiro Seki, Seiji Yunoki
By using a numerically exact diagonalization technique and a block-extended version of the finite-temperature Lanczos method, we study thermodynamic properties of an Heisen…
Phase diagram of the two-dimensional Hubbard-Holstein model: enhancement of -wave pairing between charge and magnetic orders
Natanael C. Costa, Kazuhiro Seki, Seiji Yunoki +1
We investigate the role of electron-electron and electron-phonon interactions in strongly correlated systems by performing unbiased quantum Monte Carlo simulations in the square la…
Charge stiffness and long-range correlation in the optically induced -pairing state of the one-dimensional Hubbard model
Tatsuya Kaneko, Seiji Yunoki, Andrew J. Millis
We show that optical excitation of the Mott insulating phase of the one-dimensional Hubbard model can create a state possessing two of the hallmarks of superconductivity: a nonvani…
Non-Fermi-liquid behavior and doping asymmetry in an organic Mott insulator interface
Yoshitaka Kawasugi, Kazuhiro Seki, Jiang Pu +4
High- superconductors show anomalous transport properties in their normal states, such as the bad-metal and pseudogap behaviors. To discuss their origins, it is importan…
Photoinduced electron-electron pairing in the extended Falicov-Kimball model
Ryo Fujiuchi, Tatsuya Kaneko, Yukinori Ohta +1
By employing the time-dependent exact diagonalization method, we investigate the photoexcited states of the excitonic insulator in the extended Falicov-Kimball model (EFKM). We her…
Novel MAB phases and insights into their exfoliation into 2D MBenes
Mohammad Khazaei, Junjie Wang, Mehdi Estili +5
Considering the recent breakthroughs in the synthesis of novel two-dimensional (2D) materials from layered bulk structures, ternary layered transition metal borides, known as MAB p…
Machine Learning Phase Diagram in the Half-filled One-dimensional Extended Hubbard Model
Kazuya Shinjo, Kakeru Sasaki, Satoru Hase +4
We demonstrate that supervised machine learning (ML) with entanglement spectrum can give useful information for constructing phase diagram in the half-filled one-dimensional extend…
Two-dimensional ground-state mapping of a Mott-Hubbard system in a flexible field-effect device
Yoshitaka Kawasugi, Kazuhiro Seki, Satoshi Tajima +5
A Mott insulator sometimes induces unconventional superconductivity in its neighbors when doped and/or pressurized. Because the phase diagram should be strongly related to the micr…
Possible superconductivity induced by a large spin-orbit coupling in carrier doped iridium oxide insulators: A weak coupling approach
Kazutaka Nishiguchi, Tomonori Shirakawa, Hiroshi Watanabe +2
We study possible superconductivity in a carrier-doped iridium oxide insulator SrIrO based on an effective three-orbital Hubbard model on the square lattice wi…
Fermi-liquid ground state of interacting Dirac fermions in two dimensions
Kazuhiro Seki, Yuichi Otsuka, Seiji Yunoki +1
An unbiased zero-temperature auxiliary-field quantum Monte Carlo method is employed to analyze the nature of the semimetallic phase of the two-dimensional Hubbard model on the hone…
Recent advances in MXenes: from fundamentals to applications
Mohammad Khazaei, Avanish Mishra, Natarajan S. Venkataramanan +2
The family of MAX phases and their derivative MXenes are continuously growing in terms of both crystalline and composition varieties. In the last couple of years, several breakthro…
Characterization of photoexcited states in the half-filled one-dimensional extended Hubbard model assisted by machine learning
Kazuya Shinjo, Shigetoshi Sota, Seiji Yunoki +1
Photoinduced nonequilibrium states can provide new insight into dynamical properties of strongly correlated electron systems. One of the typical and extensively studied systems is…
Topological property of a system with a honeycomb lattice structure
Beom Hyun Kim, Kazuhiro Seki, Tomonori Shirakawa +1
A system with a honeycomb lattice structure such as NaIrO was firstly proposed as a topological insulator even though NaIrO and its isostructural materia…