Zobrazeno 1 - 10
of 662
pro vyhledávání: '"Murakami, Shuichi"'
Autor:
Yoshida, Hiroki, Murakami, Shuichi
The shift current responses of two-dimensional systems in the gapless limit are investigated. As the energy gap becomes smaller, the interband transition probability becomes larger at the band edges. We found the divergence of the shift current respo
Externí odkaz:
http://arxiv.org/abs/2407.18565
Publikováno v:
Phys. Rev. B 109, 085114 (2024)
In some insulators, corner charges are fractionally quantized, due to the topological invariant called a filling anomaly. The previous theories of fractional corner charges have been mostly limited to two-dimensional systems. In three dimensions, onl
Externí odkaz:
http://arxiv.org/abs/2311.15761
Autor:
Fan, Yiliang, Wang, Huaiqiang, Tang, Peizhe, Murakami, Shuichi, Wan, Xiangang, Zhang, Haijun, Xing, Dingyu
Publikováno v:
Physical Review B 110, 035139 (2024)
Antiferromagnetic (AFM) topological insulators (TIs), which host magnetically gapped Dirac-cone surface states and exhibit many exotic physical phenomena, have attracted great attention. Here, we find that the coupled surface states can be intertwine
Externí odkaz:
http://arxiv.org/abs/2310.20693
Publikováno v:
Nano Lett. 23 (2023) 7561-7567
Chirality is an indispensable concept that pervades fundamental science and nature, manifesting itself in diverse forms such as chiral quasiparticles and chiral structures. Of particular interest are Weyl phonons carrying specific Chern numbers and c
Externí odkaz:
http://arxiv.org/abs/2307.13378
Autor:
Yao, Dapeng, Murakami, Shuichi
Publikováno v:
J. Phys. Soc. Jpn. 93, 034708 (2024)
Chiral phonons with atomic rotations converted into electron spins result in a change of spin magnetizations in crystals. In this paper, we investigate a new conversion of chiral phonons into magnons both in ferromagnets and antiferromagnets by spin
Externí odkaz:
http://arxiv.org/abs/2304.14000
Publikováno v:
Physical Review B 108, 075160 (2023)
In topological phase transitions involving a change in topological invariants such as the Chern number and the $\mathbb{Z}_2$ topological invariant, the gap closes, and the electric polarization becomes undefined at the transition. In this paper, we
Externí odkaz:
http://arxiv.org/abs/2304.12742
Autor:
Tanaka, Yutaro, Murakami, Shuichi
Publikováno v:
Phys. Rev. B 107, 245148 (2023)
We study equilibrium crystal shapes of a topological insulator (TI), a topological crystalline insulator (TCI) protected by mirror symmetry, and a second-order topological insulator (SOTI) protected by inversion symmetry. By adding magnetic fields to
Externí odkaz:
http://arxiv.org/abs/2304.08150
Autor:
Yoda, Taiki, Moritake, Yuto, Takata, Kenta, Yokomizo, Kazuki, Murakami, Shuichi, Notomi, Masaya
The non-Hermitian skin effect (NHSE) is a novel localization phenomenon in certain non-Hermitian systems with gain and/or loss. Most of previous works study the non-Hermitian skin effect in periodic systems. However, electromagnetic waves often propa
Externí odkaz:
http://arxiv.org/abs/2303.05185
Morse theory study on the evolution of nodal lines in $\mathcal{PT}$-symmetric nodal-line semimetals
Publikováno v:
Phys. Rev. B 107, 085139 (2023)
A nodal-line semimetal is a topological gapless phase containing one-dimensional degeneracies called nodal lines. The nodal lines are deformed by a continuous change of the system such as pressure and they can even change their topology, but it is no
Externí odkaz:
http://arxiv.org/abs/2211.08689
Publikováno v:
Phys. Rev. B 107, 115120 (2023)
We construct a general theory of $Z_2$ topological phase transitions in two-dimensional systems with time-reversal symmetry. We investigate the possibilities of $Z_2$ topological phase transitions at band inversions at all high-symmetry points in $k$
Externí odkaz:
http://arxiv.org/abs/2210.15974