73 citations · 338 across the 12 of their papers we have counts for
12 papers
Topological Corner States in Bilayer and Trilayer Systems with Vertically Stacked Topological Heterostructures
Natsuko Ishida, Motohiko Ezawa, Guangtai Lu +4
We investigate bilayer and trilayer systems composed of topologically distinct, vertically stacked layers, forming topological heterostructures based on the Benalcazar-Bernevig-Hug…
Nonadiabatic nonlinear non-Hermitian quantized pumping
Motohiko Ezawa, Natsuko Ishida, Yasutomo Ota +1
We analyze a quantized pumping in a nonlinear non-Hermitian photonic system with nonadiabatic driving. The photonic system is made of a waveguide array, where the distances between…
Supersymmetric non-Hermitian topological interface laser
Motohiko Ezawa, Natsuko Ishida, Yasutomo Ota +1
We investigate laser emission at the interface of a topological and trivial phases with loss and gain. The system is described by a Su-Schrieffer-Heeger model with site-dependent h…
A large-scale single-mode array laser based on a topological edge mode
Natsuko Ishida, Yasutomo Ota, Wenbo Lin +3
Topological lasers have been intensively investigated as a strong candidate for robust single-mode lasers. A typical topological laser employs a single-mode topological edge state,…
Highly excited exciton-polariton condensates
Tomoyuki Horikiri, Tim Byrnes, Kenichiro Kusudo +7
Exciton-polaritons are a coherent electron-hole-photon (e-h-p) system where condensation has been observed in semiconductor microcavities. In contrast to equilibrium Bose-Einstein…
Superradiance with an ensemble of superconducting flux qubits
Neill Lambert, Yuichiro Matsuzaki, Kosuke Kakuyanagi +3
Superconducting flux qubits are a promising candidate for realizing quantum information processing and quantum simulations. Such devices behave like artificial atoms, with the adva…
High-energy side-peak emission of exciton-polariton condensates in high density regime
Tomoyuki Horikiri, Makoto Yamaguchi, Kenji Kamide +9
In a standard semiconductor laser, electrons and holes recombine via stimulated emission to emit coherent light, in a process that is far from thermal equilibrium. Exciton-polarito…
Multi-stability and condensation of exciton-polaritons below threshold
Jiun-Yi Lien, Yueh-Nan Chen, Natsuko Ishida +3
Exciton-polaritons can condense to a macroscopic quantum state through a non-equilibrium process of pumping and decay. In recent experiments, polariton condensates are used to obse…
Photoluminescence of high-density exciton-polariton condensates
Natsuko Ishida, Tim Byrnes, Tomoyuki Horikiri +2
We examine the photoluminescence of highly-excited exciton-polariton condensates in semiconductor microcavities. Under strong pumping, exciton-polariton condensates have been obser…
Photoluminescence of a microcavity quantum dot system in the quantum strong-coupling regime
Natsuko Ishida, Tim Byrnes, Franco Nori +1
The Jaynes-Cummings model, describing the interaction between a single two-level system and a photonic mode, has been used to describe a large variety of systems, ranging from cavi…
The negative Bogoliubov dispersion in exciton-polariton condensates
Tim Byrnes, Tomoyuki Horikiri, Natsuko Ishida +2
Bogoliubov's theory states that self-interaction effects in Bose-Einstein condensates produce a characteristic linear dispersion at low momenta. One of the curious features of Bogo…
A BCS wavefunction approach to the BEC-BCS crossover of exciton-polariton condensates
Tim Byrnes, Tomoyuki Horikiri, Natsuko Ishida +1
The crossover between low and high density regimes of exciton-polariton condensates is examined using a BCS wavefunction approach. Our approach is an extension of the BEC-BCS cross…