Zobrazeno 1 - 10
of 94
pro vyhledávání: '"Takahashi, Kei S"'
Autor:
Belopolski, Ilya, Watanabe, Ryota, Sato, Yuki, Yoshimi, Ryutaro, Kawamura, Minoru, Nagahama, Soma, Zhao, Yilin, Shao, Sen, Jin, Yuanjun, Kato, Yoshihiro, Okamura, Yoshihiro, Zhang, Xiao-Xiao, Fujishiro, Yukako, Takahashi, Youtarou, Hirschberger, Max, Tsukazaki, Atsushi, Takahashi, Kei S., Chiu, Ching-Kai, Chang, Guoqing, Kawasaki, Masashi, Nagaosa, Naoto, Tokura, Yoshinori
Quantum materials governed by emergent topological fermions have become a cornerstone of physics. Dirac fermions in graphene form the basis for moir\'e quantum matter, and Dirac fermions in magnetic topological insulators enabled the discovery of the
Externí odkaz:
http://arxiv.org/abs/2411.04179
Autor:
Sato, Yuki, Nagahama, Soma, Belopolski, Ilya, Yoshimi, Ryutaro, Kawamura, Minoru, Tsukazaki, Atsushi, Kanazawa, Naoya, Takahashi, Kei S., Kawasaki, Masashi, Tokura, Yoshinori
Engineering heterostructures with various types of quantum materials can provide an intriguing playground for studying exotic physics induced by the proximity effect. Here, we report the successful synthesis of iron-based superconductor FeSe$_{x}$Te$
Externí odkaz:
http://arxiv.org/abs/2310.18147
Autor:
Watanabe, Ryota, Yoshimi, Ryutaro, Takahashi, Kei S., Tsukazaki, Atsushi, Kawasaki, Masashi, Kawamura, Minoru, Tokura, Yoshinori
Surface states of a topological insulator demonstrate interesting quantum phenomena, such as the quantum anomalous Hall (QAH) effect and the quantum magnetoelectric effect. Fermi energy tuning plays a role in inducing phase transitions and developing
Externí odkaz:
http://arxiv.org/abs/2309.13510
Autor:
Yoshimi, Ryutaro, Kawamura, Minoru, Yasuda, Kenji, Tsukazaki, Atsushi, Takahashi, Kei S., Kawasaki, Masashi, Tokura, Yoshinori
We have investigated the nonreciprocal electrical transport, that is a nonlinear resistance effect depending on the current direction, in multiferroic Rashba semiconductor (Ge,Mn)Te. Due to coexistence of ferromagnetic and ferroelectric orders, (Ge,M
Externí odkaz:
http://arxiv.org/abs/2204.12427
Autor:
Yoshimi, Ryutaro, Masuko, Makoto, Ogawa, Naoki, Kawamura, Minoru, Tsukazaki, Atsushi, Takahashi, Kei S., Kawasaki, Masashi, Tokura, Yoshinori
Publikováno v:
Phys. Rev. Materials 5, 094202 (2021)
Epitaxial thin films of (Sn$_{x}$Pb$_{1-x}$)$_{1-y}$In$_{y}$Te were successfully grown by molecular-beam-epitaxy (MBE) in a broad range of compositions (0 $\leq$ x $\leq$ 1, 0 $\leq$ y $\leq$ 0.23). We investigated electronic phases of the films by t
Externí odkaz:
http://arxiv.org/abs/2104.09436
Autor:
Kawamura, Minoru, Mogi, Masataka, Yoshimi, Ryutaro, Tsukazaki, Atsushi, Kozuka, Yusuke, Takahashi, Kei S., Kawasaki, Masashi, Tokura, Yoshinori
We report a current scaling study of a quantum phase transition between a quantum anomalous Hall insulator and a trivial insulator on the surface of a heterostructure film of magnetic topological insulators. The transition was observed by tilting the
Externí odkaz:
http://arxiv.org/abs/2007.01197
Autor:
Uchida, Masaki, Sakuraba, Ikkei, Kawamura, Minoru, Ide, Motoharu, Takahashi, Kei S., Tokura, Yoshinori, Kawasaki, Masashi
Publikováno v:
Phys. Rev. B 101, 035107 (2020)
We have studied fundamental properties of weak-link Sr2RuO4/Sr2RuO4 Josephson junctions fabricated by making a narrow constriction on superconducting Sr2RuO4 films through laser micro-patterning. The junctions show a typical overdamped behavior with
Externí odkaz:
http://arxiv.org/abs/2001.01844
Autor:
Watanabe, Ryota, Yoshimi, Ryutaro, Kawamura, Minoru, Mogi, Masataka, Tsukazaki, Atsushi, Yu, Xiuzhen, Nakajima, Kiyomi, Takahashi, Kei S, Kawasaki, Masashi, Tokura, Yoshinori
The quantum anomalous Hall effect (QAHE) is an exotic quantum phenomenon originating from dissipation-less chiral channels at the sample edge. While the QAHE has been observed in magnetically doped topological insulators (TIs), exploiting magnetic pr
Externí odkaz:
http://arxiv.org/abs/1908.07163
Autor:
Mogi, Masataka, Nakajima, Taro, Ukleev, Victor, Tsukazaki, Atsushi, Yoshimi, Ryutaro, Kawamura, Minoru, Takahashi, Kei S, Hanashima, Takayasu, Kakurai, Kazuhisa, Arima, Taka-hisa, Kawasaki, Masashi, Tokura, Yoshinori
Publikováno v:
Phys. Rev. Lett. 123, 016804 (2019)
We report a proximity-driven large anomalous Hall effect in all-telluride heterostructures consisting of ferromagnetic insulator Cr2Ge2Te6 and topological insulator (Bi,Sb)2Te3. Despite small magnetization in the (Bi,Sb)2Te3 layer, the anomalous Hall
Externí odkaz:
http://arxiv.org/abs/1906.02159
Autor:
Kawamura, Minoru, Mogi, Masataka, Yoshimi, Ryutaro, Tsukazaki, Atsushi, Kozuka, Yusuke, Takahashi, Kei. S., Kawasaki, Masashi, Tokura, Yoshinori
Publikováno v:
Phys. Rev. B 98, 140404 (2018)
We report a continuous phase transition between quantum-anomalous-Hall and trivial-insulator phases in a magnetic topological insulator upon magnetization rotation. The Hall conductivity transits from one plateau of quantized Hall conductivity $e^2/h
Externí odkaz:
http://arxiv.org/abs/1808.08930