63 citations · 229 across the 10 of their papers we have counts for
10 papers
Gapless States Localized along a Staircase Edge in Second-Order Topological Insulators
Yuki Nagasato, Yositake Takane, Yukinori Yoshimura +2
A second-order topological insulator on a two-dimensional square lattice hosts zero-dimensional states inside a band gap. They are localized near and cor…
Bulk-edge correspondence in topological transport and pumping
Ken-Ichiro Imura, Yukinori Yoshimura, Takahiro Fukui +1
The bulk-edge correspondence (BEC) refers to a one-to-one relation between the bulk and edge properties ubiquitous in topologically nontrivial systems. Depending on the setup, BEC…
Comparative study of Weyl semimetal, topological and Chern insulators: thin-film point of view
Yukinori Yoshimura, Wataru Onishi, Koji Kobayashi +2
Regarding three-dimensional (3D) topological insulators and semimetals as a stack of constituent 2D topological (or sometimes non-topological) layers is a useful viewpoint. Primari…
Engineering Dirac electrons emergent on the surface of a topological insulator
Yukinori Yoshimura, Koji Kobayashi, Tomi Ohtsuki +1
The concept of topological insulator (TI) has introduced a new point of view to condensed-matter physics, relating a priori unrelated subfields such as quantum (spin, anomalous) Ha…
Manipulating quantum channels in weak topological insulator nanoarchitectures
Akihiko Matsumoto, Takashi Arita, Yositake Takane +2
In topological insulators protected surface states are always manifest, while in topological insulators (WTI) the corresponding metallic surface states are either m…
Dimensional crossover of transport characteristics in topological insulator nanofilms
Koji Kobayashi, Yukinori Yoshimura, Ken-Ichiro Imura +1
We show how the two-dimensional (2D) topological insulator evolves, by stacking, into a strong or weak topological insulator with different topological indices, proposing a new con…
Characterizing the weak topological properties: Berry phase point of view
Yukinori Yoshimura, Ken-Ichiro Imura, Takahiro Fukui +1
We propose classification schemes for characterizing two-dimensional topological phases with nontrivial weak indices. Here, "weak" implies that the Chern number in the correspondin…
Perfectly conducting channel on the dark surface of weak topological insulators
Yukinori Yoshimura, Akihiko Matsumoto, Yositake Takane +1
A weak topological insulator (WTI) bears, generally, an even number of Dirac cones on its surface; they are susceptible of doubling, while on the surface of a certain orientation i…
Finite-size energy gap in weak and strong topological insulators
Ken-Ichiro Imura, Mayuko Okamoto, Yukinori Yoshimura +2
The non-trivialness of a topological insulator (TI) is characterized either by a bulk topological invariant or by the existence of a protected metallic surface state. Yet, in reali…
Spherical topological insulator
Ken-Ichiro Imura, Yukinori Yoshimura, Yositake Takane +1
The electronic spectrum on the spherical surface of a topological insulator reflects an active property of the helical surface state that stems from a constraint on its spin on a c…