70 citations · 254 across the 14 of their papers we have counts for
14 papers
Suppression of Gate Screening on Edge Magnetoplasmons by Highly Resistive ZnO Gate
N. Kumada, N. -H. Tu, K. -i. Sasaki +5
We investigate a way to suppress high-frequency coupling between a gate and low-dimensional electron systems in the gigahertz range by measuring the velocity of edge magnetoplasmon…
Coupling between Quantum Hall Edge Channels on Opposite Sides of a Hall Bar
Ngoc Han Tu, Masayuki Hashisaka, Takeshi Ota +4
We investigate the coupling between quantum Hall (QH) edge channels (ECs) located at opposite sides of a 50-um-wide Hall bar by exciting a charged wavepacket in one EC and detectin…
Cooperative Lifting of Spin Blockade in a Three-Terminal Triple Quantum Dot
Takashi Kobayashi, Takeshi Ota, Satoshi Sasaki +1
We report measurements of multi-path transport through a triple quantum dot (TQD) in the few-electron regime using a GaAs three-terminal device with a separate lead attached to eac…
Intrinsic and extrinsic origins of low-frequency noise in GaAs/AlGaAs Schottky-gated nanostructures
Kenichi Hitachi, Takeshi Ota, Koji Muraki
We study low-frequency noise in current passing through quantum point contacts fabricated from several GaAs/AlGaAs heterostructures with different layer structures and fabrication…
Voltage-controlled Group Velocity of Edge Magnetoplasmon in the Quantum Hall Regime
Hiroshi Kamata, Takeshi Ota, Koji Muraki +1
We investigate the group velocity of edge magnetoplasmons (EMPs) in the quantum Hall regime by means of time-of-flight measurement. The EMPs are injected from an Ohmic contact by a…
Wide-band capacitance measurement on a semiconductor double quantum dot for studying tunneling dynamics
Takeshi Ota, Toshiaki Hayashi, Koji Muraki +1
We propose and demonstrate wide-band capacitance measurements on a semiconductor double-quantum dot (DQD) to study tunneling dynamics. By applying phase-tunable high-frequency sign…