Zobrazeno 1 - 10
of 164
pro vyhledávání: '"Imura, Ken-Ichiro"'
Publikováno v:
J. Phys. Soc. Jpn. 92, 104705 (2023)
We consider transport through a non-Hermitian conductor connected to a pair of Hermitian leads and analyze the underlying non-Hermitian scattering problem. In a typical non-Hermitian system, such as a Hatano--Nelson-type asymmetric hopping model, the
Externí odkaz:
http://arxiv.org/abs/2310.00830
Autor:
Orito, Takahiro, Imura, Ken-Ichiro
Publikováno v:
Phys. Rev. B 108, 214308 (2023)
The entanglement dynamics in a non-Hermitian quantum system is studied numerically and analyzed from the viewpoint of quasiparticle picture. As a concrete model, we consider a one-dimensional tight-binding model with asymmetric hopping (Hatano-Nelson
Externí odkaz:
http://arxiv.org/abs/2308.03078
Publikováno v:
Phys. Rev. A 107, 042206 (2023)
We propose a new multi-dimensional discrete-time quantum walk (DTQW), whose continuum limit is an extended multi-dimensional Dirac equation, which can be further mapped to the Schr\"{o}dinger equation. We show in two ways that our DTQW is an excellen
Externí odkaz:
http://arxiv.org/abs/2212.13044
Autor:
Orito, Takahiro, Imura, Ken-Ichiro
The static and dynamical properties of a one-dimensional quantum system described by a non-Hermitian Hamiltonian of the so-called Hatano-Nelson type; a tight-binding model with asymmetric (or non-reciprocal) hopping, are studied. The static propertie
Externí odkaz:
http://arxiv.org/abs/2212.01001
Autor:
Orito, Takahiro, Imura, Ken-Ichiro
Publikováno v:
Phys. Rev. B 105, 024303 (2022)
Non-Hermiticity and dephasing, collaborating in an unusual wave packet dynamics, realizes unconventional entanglement evolution in a disordered, interacting and asymmetric (non-reciprocal) quantum medium. Taking the Hatano-Nelson model as a concrete
Externí odkaz:
http://arxiv.org/abs/2109.13769
Autor:
Orito, Takahiro, Imura, Ken-Ichiro
Publikováno v:
Phys. Rev. B 103, 214206 (2021)
Many-body localization (MBL) is well characterized in Fock space. To quantify the degree of this Fock space localization, the multifractal dimension $D_q$ is employed; it has been claimed that $D_q$ shows a jump from the delocalized value $D_q=1$ in
Externí odkaz:
http://arxiv.org/abs/2104.09156
Publikováno v:
Phys. Rev. Research 3, 013223 (2021)
In non-Hermitian scattering problems the behavior of the transmission probability is very different from its Hermitian counterpart; it can exceed unity or even be divergent, since the non-Hermiticity can add or remove the probability to and from the
Externí odkaz:
http://arxiv.org/abs/2011.02097
Autor:
Imura, Ken-Ichiro, Takane, Yositake
Bulk-boundary correspondence is the cornerstone of topological physics. In some non-Hermitian topological system this fundamental relation is broken in the sense that the topological number calculated for the Bloch energy band under the periodic boun
Externí odkaz:
http://arxiv.org/abs/2004.14772
We present a theoretical study of a nanowire made of a three-dimensional topological insulator. The bulk topological insulator is described by a continuum-model Hamiltonian, and the cylindrical-nanowire geometry is modelled by a hard-wall boundary co
Externí odkaz:
http://arxiv.org/abs/2003.01321
Autor:
Imura, Ken-Ichiro, Takane, Yositake
Publikováno v:
Phys. Rev. B 100, 165430 (2019)
A modified periodic boundary condition adequate for non-hermitian topological systems is proposed. Under this boundary condition a topological number characterizing the system is defined in the same way as in the corresponding hermitian system and he
Externí odkaz:
http://arxiv.org/abs/1908.09438