30 citations · 128 across the 9 of their papers we have counts for
11 papers
Time-resolved investigation of plasmon mode along interface channels in integer and fractional quantum Hall regimes
Chaojing Lin, Masayuki Hashisaka, Takafumi Akiho +2
Quantum Hall (QH) edge channels appear not only along the edge of the electron gas but also along an interface between two QH regions with different filling factors. However, the f…
Andreev reflection of fractional quantum Hall quasiparticles
Masayuki Hashisaka, Thibaut Jonckheere, Takafumi Akiho +4
Electron correlation in a quantum many-body state appears as peculiar scattering behaviour at its boundary, symbolic of which is Andreev reflection at a metal-superconductor interf…
Cryogenic GaAs high-electron-mobility-transistor amplifier for current noise measurements
Sanghyun Lee, Masayuki Hashisaka, Takafumi Akiho +2
We show that a cryogenic amplifier composed of a homemade GaAs high-electron-mobility transistor (HEMT) is suitable for current-noise measurements in a mesoscopic device at dilutio…
Quantized charge fractionalization at quantum Hall Y junctions in the disorder-dominated regime
Chaojing Lin, Masayuki Hashisaka, Takafumi Akiho +2
Fractionalization is a phenomenon where an elementary excitation partitions into several pieces. This picture explains non-trivial transport through a junction of one-dimensional e…
Energy gap tuning and gate-controlled topological phase transition in InAs/InGaSb composite quantum wells
H. Irie, T. Akiho, F. Couëdo +3
We report transport measurements of strained InAs/InGaSb composite quantum wells (CQWs) in the quantum spin Hall phase, focusing on the control of the energy gap thro…
Determination of -factor in InAs two-dimensional electron system by capacitance spectroscopy
Hiroshi Irie, Takafumi Akiho, Koji Muraki
We determine the effective -factor () of a two-dimensional electron gas (2DEG) using a new method based on capacitance spectroscopy. The capacitance-voltage profile of…