40 citations · 145 across the 13 of their papers we have counts for
8 papers · 1 filter
Gate tuning of fractional quantum Hall states in InAs two-dimensional electron gas
S. Komatsu, H. Irie, T. Akiho +3
We report the observation of fractional quantum Hall (FQH) effects in a two-dimensional electron gas (2DEG) confined to an InAs/AlGaSb quantum well, using a dual-gated Hall-bar dev…
Andreev reflection and bound state formation in a ballistic two-dimensional electron gas probed by a quantum point contact
Hiroshi Irie, Clemens Todt, Norio Kumada +4
We study coherent transport and bound-state formation of Bogoliubov quasiparticles in a high-mobility InGaAs two-dimensional electron gas (2DEG) coupled to a sup…
Josephson coupling through one-dimensional ballistic channel in semiconductor-superconductor hybrid quantum point contacts
Hiroshi Irie, Yuichi Harada, Hiroki Sugiyama +1
We study a superconducting quantum point contact made of a narrow InGaAs channel with Nb proximity electrodes. The narrow channel is formed in a gate-fitted con…
Transmission-phase measurement of the 0.7 anomaly in a quantum point contact
Toshiyuki Kobayashi, Shoei Tsuruta, Satoshi Sasaki +2
We measure the transmission phase of a quantum point contact (QPC) at a low carrier density in which electron interaction is expected to play an important role and anomalous behavi…
Non-local Control of the Kondo Effect in a Double Quantum Dot-Quantum Wire Coupled System
S. Sasaki, S. Kang, K. Kitagawa +7
We have performed low-temperature transport measurements on a double quantum dot-quantum wire coupled device and demonstrated non-local control of the Kondo effect in one dot by ma…
Shot-noise and conductance measurements of transparent superconductor / two-dimensional electron gas junctions
B. -R. Choi, A. E. Hansen, T. Kontos +6
We have measured the conductance and shot-noise of superconductor-normal metal (S-N) junctions between a Niobium (Nb) film and a 2-dimensional electron gas (2DEG), formed in an InA…
Photoluminescence measurements in Be-delta-doped back-gate induced quantum well
M. Yamaguchi, S. Nomura, D. Sato +3
The photoluminescence (PL) spectra of a two-dimensional electron system induced in a Be-delta-doped GaAs/AlGaAs quantum well (QW) with a back gate are measured. The electron densit…
Supercurrent and Conductance Quantization in a Superconducting Quantum Point Contact
T. Bauch, E. Huerfeld, V. M. Krasnov +3
We study the quantization of the supercurrent and conductance of a superconducting quantum point contact (SQPC) in a superconductor-two dimensional electrongas-superconductor (S-2D…