65 citations · 193 across the 16 of their papers we have counts for
16 papers
Programmable Spin Conversion in Gradient Quantum Matter
Mamoru Matsuo, Yuta Sekino, Hiroyuki Tajima
We propose programmable spin conversion in ultracold gases as gradient quantum matter, whose spin-dependent self-energy varies in space. Quantum kinetic theory shows that a dissipa…
Thermal Spin Polarization Driven by Nuclear Spin-Orbit Coupling in Neutron Star Pasta
Hiroyuki Tajima, Yuta Sekino, Hiroshi Funaki +3
We discuss anomalous spin polarization on the surface of nuclear pasta in a neutron star, driven by a nuclear spin-orbit interaction. We present an effective two-band model of surf…
Gyromagnetic Angular Momentum Interconversion in Neutron Stars
Hiroshi Funaki, Yuta Sekino, Hiroyuki Tajima +3
We propose a novel mechanism for angular momentum (AM) exchange between the crust and core of a neutron star (NS) via the gyromagnetic effect. Using extended hydrodynamics, we mode…
Thermomagnetic anomalies in quantum magnon transport caused by tunable junction geometries in cold atomic systems
Yuta Sekino, Yuya Ominato, Hiroyuki Tajima +2
We study magnon-driven spin and heat transport in a magnetic linear junction (MLJ) formed by two ferromagnets in optical lattices linked via linearly aligned bonds. Using the Schwi…
Non-Hermitian -wave superfluid and effects of the inelastic three-body loss in a one-dimensional spin-polarized Fermi gas
Hiroyuki Tajima, Yuta Sekino, Daisuke Inotani +3
We theoretically investigate non-Hermitian -wave Fermi superfluidity in one-dimensional spin-polarized Fermi gases which is relevant to recent ultracold atomic experiments. Cons…
Thermomagnetic Anomalies by Magnonic Criticality in Ultracold Atomic Transport
Yuta Sekino, Yuya Ominato, Hiroyuki Tajima +2
We investigate thermomagnetic transport in an ultracold atomic system with two ferromagnets linked via a magnetic quantum point contact. Using nonequilibrium Green's function appro…
Exploring Superfluid in Dilute Spin-Polarized Neutron Matter
Hiroyuki Tajima, Hiroshi Funaki, Yuta Sekino +2
We explore the theoretical possibility of neutron superfluid in dilute spin-polarized neutron matter, which may be relevant to the crust region of a magnetized neutron star…
Spin conductivity spectrum and spin superfluidity in a binary Bose mixture
Yuta Sekino, Hiroyuki Tajima, Shun Uchino
We investigate the spectrum of spin conductivity for a miscible two-component Bose-Einstein condensate (BEC) that exhibits spin superfluidity. By using the Bogoliubov theory, the r…
Non-Hermitian topological Fermi superfluid near the -wave unitary limit
Hiroyuki Tajima, Yuta Sekino, Daisuke Inotani +3
We theoretically discuss the non-Hermitian superfluid phase transition in one-dimensional two-component Fermi gases near the -wave Feshbach resonance accompanied by the two-body…
Dominant Andreev Reflection through Nonlinear Radio-Frequency Transport
Tingyu Zhang, Hiroyuki Tajima, Yuta Sekino +2
We theoretically propose the laser-induced Andreev reflection between two-component Fermi superfluid and normal states via spatially-uniform Rabi couplings. By analyzing the tunnel…
Optical spin transport theory of spin-1/2 topological Fermi superfluids
Hiroyuki Tajima, Yuta Sekino, Shun Uchino
We theoretically investigate optical (frequency-dependent) bulk spin transport properties in a spin-1/2 topological Fermi superfluid. We specifically consider a one-dimensional sys…
Optical spin conductivity in ultracold quantum gases
Yuta Sekino, Hiroyuki Tajima, Shun Uchino
We show that the optical spin conductivity being a small AC response of a bulk spin current and elusive in condensed matter systems can be measured in ultracold atoms. We demonstra…
Field-theoretical aspects of one-dimensional Bose and Fermi gases with contact interactions
Yuta Sekino, Yusuke Nishida
We investigate local quantum field theories for one-dimensional (1D) Bose and Fermi gases with contact interactions, which are closely connected with each other by Girardeau's Bose…
Mesoscopic spin transport between strongly interacting Fermi gases
Yuta Sekino, Hiroyuki Tajima, Shun Uchino
We investigate a mesoscopic spin current for strongly interacting Fermi gases through a quantum point contact. Under the situation where spin polarizations in left and right reserv…
Quantum droplet of one-dimensional bosons with a three-body attraction
Yuta Sekino, Yusuke Nishida
Ultracold atoms offer valuable opportunities where interparticle interactions can be controlled at will. In particular, by extinguishing the two-body interaction, one can realize u…
Comparative study of one-dimensional Bose and Fermi gases with contact interactions from the viewpoint of universal relations for correlation functions
Yuta Sekino, Shina Tan, Yusuke Nishida
One-dimensional spinless Bose and Fermi gases with contact interactions have the close interrelation via Girardeau's Bose-Fermi mapping, leading to the correspondences in their ene…