New approach to the physics of two dimensional electron systems

二维电子系统物理学的新方法

• 批准号: 21244047
• 负责人: OKAMOTO Tohru
• 金额: $ 30.04万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009-04-01 至 2013-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21244047/
• 关键词: 表面・界面; 低温物性; 表面物性; 表面・界面物性; 半導体物性; 強相関電子系

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.

我们研究了高迁移率硅二维电子系统中的磁输运通过原位倾斜的样品相对于磁场。在朗道水平交叉过程中观察到的非整数填充因子的纵向电阻率的显着下降。这表明，在相关的朗道能级的电子成为本地化的coincidence.Cyclotron共振的二维电子的研究在低温下的高迁移率的Si/SiGe表现出金属的直流电阻率的温度依赖性。弛豫时间表现出负的温度依赖性，这是类似的输运散射时间。二维（2D）超导电性研究的单原子层Pb膜的解理GaAs表面的磁输运测量。结果解释在一个非均匀的超导状态预测的2D金属与一个大的Rashba自旋分裂。

项目成果

Superconductivity of ultrathin metallic films on cleaved GaAs surfaces

解理 GaAs 表面超薄金属薄膜的超导性

• 发表时间: 2012
• 作者: T. Sekihara;R. Masutomi;and T. Okamoto
• 通讯作者: and T. Okamoto

Well-width dependence of valley splitting in Si/SiGe quantum wells

Si/SiGe 量子阱中谷分裂的阱宽依赖性

• DOI: 10.1063/1.3270539
• 发表时间: 2009
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: K. Sasaki;R. Masutomi;K. Toyama;K. Sawano;Y. Shiraki;and T. Okamoto
• 通讯作者: and T. Okamoto

Recent publications (Okamoto group)

最近发表的文章（冈本组）

Strongly correlated two-dimensional system and superconductivity in one atomic layer

强相关二维系统与单原子层超导

• 发表时间: 2013
• 作者: 七尾翼;井上壮志;近森正敏;宮武裕和;吉見彰洋;古川武;他;藤田高史，森本和浩，寺岡総一郎，Allison Giles，Arne Ludwig，Andreas Wieck，大岩顕，樽茶清悟;赤木和人;R. Masutomi
• 通讯作者: R. Masutomi

Hysteresis in magnetoresistance of InAs surface inversion layers covered with submonolayer of Fe films

亚单层 Fe 薄膜覆盖的 InAs 表面反型层的磁阻磁滞

• 发表时间: 2009
• 作者: T.Mochizuki;R.Masutomi;T.Okamoto
• 通讯作者: T.Okamoto