Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Ryo Okugawa"'
Publikováno v:
Physical Review Research, Vol 6, Iss 3, p 033088 (2024)
Weyl superconductivity is a topological phase in three-dimensional crystals in which the Weyl equation describes quasiparticle excitation near band-touching points in momentum space called Weyl nodes. For quasicrystals which lack translational symmet
Externí odkaz:
https://doaj.org/article/6eb6ae8b7ad94995b9767e293006ae6d
Publikováno v:
Physical Review Research, Vol 3, Iss 4, p 043064 (2021)
Dynamical quantum phase transitions (DQPTs) are topologically characterized in quantum quench dynamics in topological systems. In this paper, we study Loschmidt amplitudes and DQPTs in quantum quenches in mirror-symmetric topological phases. Based on
Externí odkaz:
https://doaj.org/article/07cdf0e23259453b8045d5c6328d7ece
Publikováno v:
Nature Communications, Vol 8, Iss 1, Pp 1-9 (2017)
The nodal-line semimetals exhibit an intriguing interplay between topology, symmetry and materials science. Here, Hirayamaet al. predict a nodal-line semimetal phase resulting from the pi Berry phase in alkaline-earth metals, and show that the nodal
Externí odkaz:
https://doaj.org/article/c51e6a612b3243f59a693024f1473a5e
Publikováno v:
Physical Review B. 105
We give a bulk-hinge correspondence for higher-order topological phases protected by rotoinversion $C_{4}\mathcal{I}$ symmetry in magnetic systems. Our approach allows us to show the emergence of the chiral hinge modes only from the information of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::101a26d698f04bda0d1eb2e0836419c3
https://doi.org/10.1103/physrevb.105.115119
https://doi.org/10.1103/physrevb.105.115119
Dynamical quantum phase transitions (DQPTs) are topologically characterized in quantum quench dynamics in topological systems. In this paper, we study Loschmidt amplitudes and DQPTs in quantum quenches in mirror-symmetric topological phases. Based on
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3d5c832a5577a6b55881c598f2efec45
http://arxiv.org/abs/2105.12768
http://arxiv.org/abs/2105.12768
Non-Hermitian skin effects and exceptional points are topological phenomena characterized by integer winding numbers. In this study, we give methods to theoretically detect skin effects and exceptional points by generalizing inversion symmetry. The g
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6839d7b183fd56d7c94525a95326696d
http://arxiv.org/abs/2103.05141
http://arxiv.org/abs/2103.05141
We propose indicators of the discriminant for systems with generalized inversion symmetry which are computed from data only at high-symmetry points in the Brillouin zone. Our approach captures the exceptional points and their symmetry-protected varia
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::054441e42c273925fd79cd85360c9d8b
Publikováno v:
Physical Review B. 102
Higher-order topology realizes topologically robust corner modes as a manifestation of nontriviality. We theoretically propose non-Hermitian skin effects which stem from second-order topology of chiral-symmetric Hermitian systems. It is found that th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0ee5d9a33e10e0bfce9ab60a558bcbc7
https://doi.org/10.1103/physrevb.102.241202
https://doi.org/10.1103/physrevb.102.241202
Publikováno v:
Physical Review B. 100
We study second-order topological insulators and semimetals characterized by chiral symmetry. We investigate topological phase transitions of a model for construction of the two-dimensional second-order topological insulators protected only by chiral
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f8ced11a682ae40a16ea4e693eac133f
https://doi.org/10.1103/physrevb.100.235302
https://doi.org/10.1103/physrevb.100.235302
Autor:
Takehito Yokoyama, Ryo Okugawa
Publikováno v:
Physical Review B. 99
We study a topological band degeneracy in non-Hermitian systems with parity-time ($PT$) and parity-particle-hole ($CP$) symmetries. In $d$-dimensional non-Hermitian systems, it is shown that $(d-1)$-dimensional exceptional surfaces can appear from ba
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::428dc91db8c15440e9bea558c84f87c4
https://doi.org/10.1103/physrevb.99.041202
https://doi.org/10.1103/physrevb.99.041202