198 citations · 626 across the 9 of their papers we have counts for
9 papers
Copula-Based Density Estimation Models for Multivariate Zero-Inflated Continuous Data
Keita Hamamoto
Zero-inflated continuous data ubiquitously appear in many fields, in which lots of exactly zero-valued data are observed while others distribute continuously. Due to the mixed stru…
Symmetry conditions for the superconducting diode effect in chiral superconductors
Bastian Zinkl, Keita Hamamoto, Manfred Sigrist
We analyze the presence of non-reciprocal critical currents, the so-called superconducting diode effect, in chiral superconductors within a generalized Ginzburg-Landau framework. A…
Scaling Theory of Quantum Ratchet
Keita Hamamoto, Takamori Park, Hiroaki Ishizuka +1
The asymmetric responses of the system between the external force of right and left directions are called "nonreciprocal". There are many examples of nonreciprocal responses such a…
Spin supercurrent in two-dimensional superconductors with Rashba spin-orbit interaction
James Jun He, Kanta Hiroki, Keita Hamamoto +1
Spin current is a central theme in spintronics, and its generation is a keen issue. The spin-polarized current injection from the ferromagnet, spin battery, and spin Hall effect ha…
Nonreciprocal charge transport in two-dimensional noncentrosymmetric superconductors
Shintaro Hoshino, Ryohei Wakatsuki, Keita Hamamoto +1
Nonreciprocal charge transport phenomena are studied theoretically for two-dimensional noncentrosymmetric superconductors under an external magnetic field . Rashba superconducto…
Electrical detection of a skyrmion in a magnetic tunneling junction
Keita Hamamoto, Naoto Nagaosa
We theoretically investigated a method to detect a single skyrmion in a magnetic tunneling junction (MTJ) geometry. Using the tunneling Hamiltonian approach, we calculated the tunn…
Nonlinear spin current generation in noncentrosymmetric spin-orbit coupled systems
Keita Hamamoto, Motohiko Ezawa, Kun Woo Kim +2
Spin current plays a central role in spintronics. In particular, finding more efficient ways to generate spin current has been an important issue and studied actively. For example,…
Purely electrical detection of a skyrmion in constricted geometry
Keita Hamamoto, Motohiko Ezawa, Naoto Nagaosa
How to detect the skyrmion position is a crucial problem in future skyrmionics since it corresponds to the reading process of information. We propose a method to detect the skyrmio…
Quantized Anomalous Hall Effects in Skyrmion Crystal
Keita Hamamoto, Motohiko Ezawa, Naoto Nagaosa
We theoretically study the quantized anomalous Hall effect (QAHE) in skyrmion crystal (SkX) without external magnetic field. The emergent magnetic field in SkX could be gigantic as…