2013 Fiscal Year Final Research Report
New approach to the physics of two dimensional electron systems
| Project/Area Number |
21244047
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics I
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| Research Institution | The University of Tokyo |
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Principal Investigator |
OKAMOTO Tohru 東京大学, 理学(系)研究科(研究院), 准教授 (60245371)
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| Co-Investigator(Renkei-kenkyūsha) |
MASUTOMI Ryuichi 東京大学, 大学院理学系研究科, 助教 (00397027)
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| Project Period (FY) |
2009-04-01 – 2013-03-31
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| Keywords | 表面・界面 |
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| Research Abstract |
We study magnetotransport in a high-mobility Si two-dimensional electron system by in situ tilting of the sample relative to the magnetic field. A pronounced dip in the longitudinal resistivity is observed during the Landau-level crossing process for noninteger filling factors. This indicates that electrons in the relevant Landau levels become localized at the coincidence.
Cyclotron resonance of two-dimensional electrons is studied at low temperatures for a high-mobility Si/SiGe which exhibits a metallic temperature dependence of dc resistivity. The relaxation time shows a negative temperature dependence, which is similar to that of the transport scattering time.
Two-dimensional (2D) superconductivity was studied by magnetotransport measurements on single-atomic-layer Pb films on a cleaved GaAs surface. The results are explained in terms of an inhomogeneous superconducting state predicted for 2D metals with a large Rashba spin splitting.
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