98 citations · 530 across the 19 of their papers we have counts for
20 papers
Localized states of the non-Hermitian Schr{ö}dinger equation with a complex potential: from Efimov states to bipolarons
Kyoka Tsunoda, Kazuki Yamamoto, Shimpei Endo
We study the non-Hermitian Schrödinger equation with a complex potential, which bridges Hermitian few-body and non-Hermitian many-body physics: a real attractive potentia…
Fourth cluster and virial coefficients of a unitary Fermi gas for an arbitrary mass ratio
Shimpei Endo, Yvan Castin
We calculate the fourth cluster coefficients of the homogeneous unitary spin 1/2 Fermi gas as functions of the internal-state mass ratio, over intervals constrained by the 3- or 4-…
Equivalence of dissipative and dissipationless dynamics of interacting quantum systems with its application to the unitary Fermi gas
Masaaki Tokieda, Shimpei Endo
We analytically study quantum dissipative dynamics described by the Caldirola-Kanai model with inter-particle interactions. We have found that the dissipative quantum dynamics of t…
Eigenvalues of two-state quantum walks induced by the Hadamard walk
Shimpei Endo, Takako Endo, Takashi Komatsu +1
Existence of the eigenvalues of the discrete-time quantum walks is deeply related to localization of the walks. We revealed the distributions of the eigenvalues given by the splitt…
Universality of an impurity in a Bose-Einstein condensate
Shuhei M. Yoshida, Shimpei Endo, Jesper Levinsen +1
Universality is a powerful concept in physics, allowing one to construct physical descriptions of systems that are independent of the precise microscopic details or energy scales.…
Universality of the unitary Fermi gas: A few-body perspective
Jesper Levinsen, Pietro Massignan, Shimpei Endo +1
We revisit the properties of the two-component Fermi gas with short-range interactions in three dimensions, in the limit where the s-wave scattering length diverges. Such a unitary…
The interaction-sensitive states of a trapped two-component ideal Fermi gas and application to the virial expansion of the unitary Fermi gas
Shimpei Endo, Yvan Castin
We consider a two-component ideal Fermi gas in an isotropic harmonic potential. Some eigenstates have a wavefunction that vanishes when two distinguishable fermions are at the same…
Scattering of universal fermionic clusters in the resonating group method
Pascal Naidon, Shimpei Endo, Antonio M. García-García
Mixtures of polarised fermions of two different masses can form weakly-bound clusters, such as dimers and trimers, that are universally described by the scattering length between t…
Universal clusters as building blocks of stable quantum matter
Shimpei Endo, Antonio M. García-García, Pascal Naidon
We present an exploratory study that suggests that Efimov physics, a leading research theme in few-body quantum physics, can also induce stable many-body ground states whose buildi…
Absence of a four-body Efimov effect in the 2 + 2 fermionic problem
Shimpei Endo, Yvan Castin
In the free three-dimensional space, we consider a pair of identical fermions of some species or in some internal state, and a pair of identical fermions of…
Weak limit theorem of a two-phase quantum walk with one defect
Shimpei Endo, Takako Endo, Norio Konno +2
We attempt to analyze a one-dimensional space-inhomogeneous quantum walk (QW) with one defect at the origin, which has two different quantum coins in positive and negative parts. W…
The third virial coefficient of a two-component unitary Fermi gas across an Efimov-effect threshold
Chao Gao, Shimpei Endo, Yvan Castin
We consider a mixture of two single-spin-state fermions with an interaction of negligible range and infinite -wave scattering length. By varying the mass ratio across $α_c\s…
Limit theorems of a two-phase quantum walk with one defect
Shimpei Endo, Takako Endo, Norio Konno +2
We treat a position dependent quantum walk (QW) on the line which we assign two different time-evolution operators to positive and negative parts respectively. We call the model "t…
Microscopic Origin and Universality Classes of the Efimov Three-Body Parameter
Pascal Naidon, Shimpei Endo, Masahito Ueda
The low-energy spectrum of three particles interacting via nearly resonant two-body interactions in the Efimov regime is set by the so-called three-body parameter. We show that the…
Perfect screening of the inter-polaronic interaction
Shimpei Endo, Masahito Ueda
We consider heavy particles immersed in a Fermi sea of light fermions, and study the interaction between the heavy particles induced by the surrounding light fermions. With the Bor…
Scattering and bound states of two polaritons in an array of coupled cavities
Chuan-zhou Zhu, Shimpei Endo, Pascal Naidon +1
We develop an analytical approach for calculating the scattering and bound states of two polaritons in a one-dimensional (1D) infinite array of coupled cavities, with each cavity c…
Physical Origin of the Universal Three-body Parameter in Atomic Efimov Physics
Pascal Naidon, Shimpei Endo, Masahito Ueda
We address the microscopic origin of the universal three-body parameter that fixes the spectrum of three-atom systems in the Efimov regime. We identify it with the van der Waals tw…
Crossover trimers connecting continuous and discrete scaling regimes
Shimpei Endo, Pascal Naidon, Masahito Ueda
For a system of two identical fermions and one distinguishable particle interacting via a short-range potential with a large s-wave scattering length, the Efimov trimers and Kartav…
Universal physics of 2+1 particles with non-zero angular momentum
Shimpei Endo, Pascal Naidon, Masahito Ueda
The zero-energy universal properties of scattering between a particle and a dimer that involves an identical particle are investigated for arbitrary scattering angular momenta. For…
Tight-binding photonic bands in metallophotonic waveguide networks and flat bands in kagome lattices
Shimpei Endo, Takashi Oka, Hideo Aoki
We propose that we can realize "tight-binding photonic bands" in metallophotonic waveguide networks, where the photonic bound states localized around the crossings of a network for…