Magneto Transport and Quantum Effects in Electron Systems

电子系统中的磁输运和量子效应

• 批准号: 04452037
• 负责人: IYE Yasuhiro
• 金额: $ 4.22万
• 依托单位: Univ.of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452037/
• 关键词: magnetoresistance; modulated structure; low dimensional electron system; layred structure; ADMRO; Fermi surface; 層状物質; ヘテロ構造; 2次元電子; 超伝導多層膜

The following are the main research accomplishments of this project :(1)Angular dependent magnetoresistance oscillation(ADMRO) effect in organic conductors.Angular dependent oscillatory magnetoresistance has been observed in organic conductors, (BEDT-TTG)_2KHg(SCN)_4 and (BEDT-TTG)_2NH_4Hg(SCN)_4. We have performed precise measurements of the angular dependence by two-axis rotation of samples in high magnetic fields to clarify that the ADMRO in the latter system is a standard one arising form a modulated cylindrical Fermi surface, while that in the latter is attributed to a pair of open Fermi sheet. We have also made a model calculation which reproduced the ADMRO traces of the latter system quantitatively.(2)ADMRO effect in synthetic layred metal --- SbCl_5-intercalated graphiteWe have also observed the ADMRO in intercalated graphite. Analysis of both the ADMRO and the Shubnikov-de Haas effect powerful means of reconstruction of the Fermi surface, which is known to be complex in this system due to zone folding effect and magnetic breakdown effect.(3)ADMRO effect in tailored Fermi surface of GaAs/AlGaAs superlattice.We have designed and fabricated cylindrical Fermi surface in GaAs/AlGaAs superlattice and demonstrated that the ADMRO occurs most distinctly in the out-of-plane resistivity.(4)Magnetotransport in modulated magnetic field.We have theoretically analyzed the effect of one-dimensionally modulated magnetic field on two-dimensional electron gas. We have made an experimental attempt by use of a grid gate made of ferromagnetic substances.

本课题的主要研究成果如下：(1)有机导体中的角相关磁阻振荡(ADMRO)效应。在有机导体(BEDT-TTG)_2KHg(SCN)_4和(BEDT)中观察到了角相关振荡磁阻。 -TTG)_2NH_4Hg(SCN)_4。我们通过在高磁场中对样品进行两轴旋转来精确测量角度依赖性，以阐明后一个系统中的 ADMRO 是由调制的圆柱费米面产生的标准 ADMRO，而后者则归因于一对开放费米片。我们还进行了模型计算，定量地再现了后一体系的ADMRO痕迹。(2)合成层状金属——SbCl_5插层石墨中的ADMRO效应我们还观察到了插层石墨中的ADMRO。对ADMRO和舒布尼科夫-德哈斯效应的分析是重建费米面的有力手段，由于区域折叠效应和磁击穿效应，费米面在该系统中是复杂的。(3)定制费米面中的ADMRO效应GaAs/AlGaAs超晶格。我们在GaAs/AlGaAs超晶格中设计并制造了圆柱形费米面，并证明ADMRO在面外发生最明显(4)调制磁场中的磁输运。从理论上分析了一维调制磁场对二维电子气的影响。我们利用铁磁物质制成的栅极进行了实验尝试。

项目成果

Y.Iye et al.: "Resonant Angular Oscillation of Magnetoresistance in Synthetic Layered Metal:Stage 2 SbCl_5-Intercalated Graphite" J.Phys.Soc.Jpn.(印刷中).

Y.Iye 等人：“合成层状金属中磁阻的共振角振荡：第 2 阶段 SbCl_5-插层石墨”J.Phys.Soc.Jpn。

R.Yagi and Y.Iye: "The Angular Dependent Magnetoresistance Oscillation Effect of Cylindrical Fermi Surface with Different Corrugation Symmetries" Solid State Commun.89. 275-281 (1994)

R.Yagi 和 Y.Iye：“具有不同波纹对称性的圆柱形费米表面的角相关磁阻振荡效应”固态通讯.89。

R.Yagi and Y.Iye: "Oscillatory Magnetoresistance in Two-Dimensional Electron Systems in a Periodically Modulated Magnetic Field" J.Phys.Soc.Jpn. 62. 1279-1285 (1993)

R.Yagi 和 Y.Iye：“周期性调制磁场中二维电子系统中的振荡磁阻”J.Phys.Soc.Jpn。

Y.Iye, M.Baxndale and V.Z.Mordkovich: "Resonant Angular Oscillation of Magnetoresistance in Synthetic Layred Metal : Stage 2 SbCl_5-Intercalated Graphite" J.Phys.Soc.Jpn.(Letters). (to be published).

Y.Iye、M.Baxndale 和 V.Z.Mordkovich：“合成层状金属中磁阻的共振角振荡：第 2 阶段 SbCl_5-插层石墨”J.Phys.Soc.Jpn.（快报）。

R.Yagi, Y.Iye, Y.Hashimoto, T.Odagiri, H.Noguchi, H.Sakaki and T.Ikoma: "Angular Dependent Magnetoresistance Oscillation in GaAs/Al_xGa_<1-x>As Superlattice" J.Phys.Soc.Jpn.60. 3784-3791 (1991)

R.Yagi、Y.Iye、Y.Hashimoto、T.Odagiri、H.Noguchi、H.Sakaki 和 T.Ikoma：“GaAs/Al_xGa_<1-x>As 超晶格中的角相关磁阻振荡”J.Phys.Soc