Search Results for author: Ryotaro Arita

Found 7 papers, 2 papers with code

Gate-controlled BCS-BEC crossover in a two-dimensional superconductor

no code implementations10 Dec 2020 Yuji Nakagawa, Yuichi Kasahara, Takuya Nomoto, Ryotaro Arita, Tsutomu Nojima, Yoshihiro Iwasa

The Bardeen-Cooper-Schrieffer (BCS) condensation and the Bose-Einstein condensation (BEC) are the two extreme limits of the ground state of the paired fermion systems.

Superconductivity

Efficient fluctuation exchange approach to low-temperature spin fluctuations and superconductivity: from the Hubbard model to Na$_x$CoO$_2\cdot y$H$_2$O

no code implementations8 Dec 2020 Niklas Witt, Erik G. C. P. van Loon, Takuya Nomoto, Ryotaro Arita, Tim Wehling

Superconductivity arises mostly at energy and temperature scales that are much smaller than the typical bare electronic energies.

Strongly Correlated Electrons Superconductivity

First-Principles Design of Halide-Reduced Electrides: Magnetism and Topological Phases

no code implementations3 Nov 2020 Tonghua Yu, Motoaki Hirayama, José A. Flores-Livas, Takuya Nomoto, Ryotaro Arita

We propose a design scheme for seeking potential electrides derived from conventional materials.

Materials Science Strongly Correlated Electrons

Enhancement of transverse thermoelectric conductivity originating from stationary points in nodal line

no code implementations28 Aug 2020 Susumu Minami, Fumiyuki Ishii, Motoaki Hirayama, Takuya Nomoto, Takashi Koretsune, Ryotaro Arita

Motivated by the recent discovery of a large anomalous Nernst effect in Co$_2$MnGa, Fe$_3X$ ($X$=Al, Ga) and Co$_3$Sn$_2$S$_2$, we performed a first-principles study to clarify the origin of the enhancement of the transverse thermoelectric conductivity ($\alpha_{ij}$) in these ferromagnets.

Materials Science Mesoscale and Nanoscale Physics

Quantum Crystal Structure in the 250 K Superconducting Lanthanum Hydride

no code implementations27 Jul 2019 Ion Errea, Francesco Belli, Lorenzo Monacelli, Antonio Sanna, Takashi Koretsune, Terumasa Tadano, Raffaello Bianco, Matteo Calandra, Ryotaro Arita, Francesco Mauri, José A. Flores-Livas

The relevance of quantum fluctuations in the energy landscape found here questions many of the crystal structure predictions made for hydrides within a classical approach that at the moment guide the experimental quest for room-temperature superconductivity [4, 5, 6].

Superconductivity Materials Science

Efficient method to calculate the electron-phonon coupling constant and superconducting transition temperature

1 code implementation29 Oct 2016 Takashi Koretsune, Ryotaro Arita

We show an efficient way to compute the electron-phonon coupling constant, $\lambda$, and the superconducting transition temperature, Tc from first-principles calculations.

Superconductivity

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