249 citations · 569 across the 20 of their papers we have counts for
20 papers
Effect of Parallel Magnetic Field on Superconductivity of Ultrathin Metal Films Grown on a Cleaved GaAs Surface
Takayuki Sekihara, Takahiro Miyake, Ryuichi Masutomi +1
The parallel-magnetic-field dependence of the superconducting transition temperature is studied for ultrathin films of In, Bi, and Al grown on GaAs(110). In the…
Magnetic-Field-Induced Superconductivity in Ultrathin Pb Films with Magnetic Impurities
Masato Niwata, Ryuichi Masutomi, Tohru Okamoto
It is well known that external magnetic fields and magnetic moments of impurities both suppress superconductivity. Here, we demonstrate that their combined effect enhances the supe…
Two-dimensional superconducting state of monolayer Pb films grown on GaAs(110) in a strong parallel magnetic field
Takayuki Sekihara, Ryuichi Masutomi, Tohru Okamoto
Two dimensional (2D) superconductivity was studied by magnetotransport measurements on single-atomic-layer Pb films on a cleaved GaAs(110) surface. The superconducting transition t…
In-plane magnetic field dependence of cyclotron relaxation time in a Si two-dimensional electron system
Tasuku Chiba, Ryuichi Masutomi, Kentarou Sawano +2
Cyclotron resonance of two-dimensional electrons is studied for a high-mobility Si/SiGe quantum well in the presence of an in-plane magnetic field, which induces spin polarization.…
Metallic Behavior of Cyclotron Relaxation Time in Two-Dimensional Systems
Ryuichi Masutomi, Kohei Sasaki, Ippei Yasuda +4
Cyclotron resonance of two-dimensional electrons is studied at low temperatures down to 0.4 K for a high-mobility Si/SiGe quantum well which exhibits a metallic temperature depende…
Well-width dependence of valley splitting in Si/SiGe quantum wells
Kohei Sasaki, Ryuichi Masutomi, Kiyohiko Toyama +3
The valley splitting in Si two-dimensional electron systems is studied using Si/SiGe single quantum wells (QWs) with different well widths. The energy gaps for 4 and 5.3 nm QWs, ob…