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Unconventional superconductivity on a topological insulator
Jacob Linder, Yukio Tanaka, Takehito Yokoyama +2
We study proximity-induced superconductivity on the surface of a topological insulator (TI), focusing on unconventional pairing. We find that the excitation spectrum becomes gaples…
Anomalous magnetoresistance on the topological surface
Takehito Yokoyama, Yukio Tanaka, Naoto Nagaosa
We investigate charge transport in two-dimensional ferromagnet/feromagnet junction on a topological insulator. The conductance across the interface depends sensitively on the direc…
Manipulation of Majorana fermion, Andreev reflection and Josephson current on topological insulators
Yukio Tanaka, Takehito Yokoyama, Naoto Nagaosa
We study theoretically charge transport properties of normal metal (N) / ferromagnet insulator (FI) / superconductor (S) junction and S/FI/S junction formed on the surface of three…
Optical conductivity of doped Mott insulator: the interplay between correlation and electron-phonon interaction
Giulio Dr. De Filippis, Vittorio Cataudella, Andrey Dr. Mishchenko +2
The optical conductivity (OC) of cuprates is studied theoretically in the low density limit of the t-t'-J-Holstein model. By developing a limited phonon basis exact diagonalization…
Electro-spinon in one-dimensional Mott insulator
Hosho Katsura, Masahiro Sato, Takashi Furuta +1
The low-energy dynamical optical response of dimerized and undimerized spin liquid states in a one-dimensional charge transfer Mott insulator is theoretically studied. An exact ana…
Purely electric spin pumping in one-dimension
Yshai Avishai, Doron Cohen, Naoto Nagaosa
We show theoretically that a simple one dimensional system (such as metallic wire) can display quantum spin pumping possibly without pushing any charge. It is achieved by applying…