238 citations · 623 across the 24 of their papers we have counts for
24 papers
Topological phase diagram of the Haldane model on a Bishamon-kikko--honeycomb lattice
Sogen Ikegami, Kiyu Fukui, Shun Okumura +2
Topological flat bands have gained extensive interest as a platform for exploring the interplay between nontrivial band topology and correlation effects. In recent studies, strongl…
Emergent electric field from magnetic resonances in a one-dimensional chiral magnet
Kotaro Shimizu, Shun Okumura, Yasuyuki Kato +1
The emergent electric field (EEF) is a fictitious electric field acting on conduction electrons through the Berry phase mechanism. The EEF is generated by the dynamics of noncollin…
Instability of magnetic skyrmion strings induced by longitudinal spin currents
Shun Okumura, Volodymyr P. Kravchuk, Markus Garst
It is well established that spin-transfer torques exerted by in-plane spin currents give rise to a motion of magnetic skyrmions resulting in a skyrmion Hall effect. In films of fin…
Anomalous Hall effect of light-driven three-dimensional Dirac electrons in bismuth
Yoshua Hirai, Naotaka Yoshikawa, Masashi Kawaguchi +4
Recent advancement in laser technology has opened the path toward the manipulation of functionalities in quantum materials by intense coherent light. Here, we study three-dimension…
TEM at Millikelvin Temperatures: Observing and Utilizing Superconducting Qubits
Hiroshi Okamoto, Reza Firouzmandi, Ryosuke Miyamura +4
We present a case for developing a millikelvin-temperature transmission electron microscope (TEM). We start by reviewing known reasons for such development, then present new possib…
Light-induced anomalous Hall conductivity in massive 3D Dirac semimetal CoSnS
Naotaka Yoshikawa, Shun Okumura, Yoshua Hirai +10
Weyl semimetals can emerge from Dirac semimetals when the time-reversal or spatial-inversion symmetries are broken. Recently, it has been proposed based on the Floquet theory that…