374 citations · 2.6k across the 55 of their papers we have counts for
9 papers · 1 filter
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…
Photonic crystal nanocavity based on a topological corner state
Yasutomo Ota, Feng Liu, Ryota Katsumi +4
Topological phonics has emerged as a novel approach to engineer the flow of light and provides unprecedented means for developing diverse photonic elements, including robust optica…
Strongly coupled single quantum dot-cavity system integrated on a CMOS-processed silicon photonic chip
Alto Osada, Yasutomo Ota, Ryota Katsumi +3
Quantum photonic integrated circuit (QPIC) is a promising tool for constructing integrated devices for quantum technology applications. In the optical regime, silicon photonics emp…
Optical coupling between atomically-thin black phosphorus and a two dimensional photonic crystal nanocavity
Yasutomo Ota, Rai Moriya, Naoto Yabuki +5
Atomically-thin black phosphorus (BP) is an emerging two dimensional (2D) material exhibiting bright photoluminescence in the near infrared. Coupling its radiation to photonic nano…
Scheme for media conversion between electronic spin and photonic orbital angular momentum based on photonic nanocavity
Chee Fai Fong, Yasutomo Ota, Satoshi Iwamoto +1
Light with nonzero orbital angular momentum (OAM) or twisted light is promising for quantum communication applications such as OAM-entangled photonic qubits. There exist photonic O…
P-shell carriers assisted dynamic nuclear spin polarization in single quantum dots at zero external magnetic field
C. F. Fong, Y. Ota, E. Harbord +2
Repeated injection of spin polarized carriers in a quantum dot leads to the polarization of nuclear spins, a process known as dynamic nuclear spin polarization (DNP). Here, we repo…
Impact of electron-phonon interactions on quantum-dot cavity quantum electrodynamics
Y. Ota, S. Iwamoto, N. Kumagai +1
Semiconductor quantum dots (QDs) in photonic nanocavities provide monolithic, robust platforms for both quantum information processing and cavity quantum electrodynamics (QED). An…