2013 Fiscal Year Final Research Report
Theoretical study of multi-terminal quantum dot: proposal of tunable spin Hall effect
| Project/Area Number |
22540333
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Condensed matter physics I
|
|---|
| Research Institution | Keio University |
|---|
Principal Investigator |
ETO Mikio 慶應義塾大学, 理工学部, 教授 (00221812)
|
|---|
| Project Period (FY) |
2010-04-01 – 2014-03-31
|
| Keywords | メゾスコピック系 / 量子ドット / スピンエレクトロニクス / スピン軌道相互作用 / 近藤効果 / スピンホール効果 / ナノワイヤ / ジョセフソン接合 |
|---|
| Research Abstract |
Physical phenomena have been theoretically investigated in multi-terminal quantum dots fabricated on semiconductors. (1) We have found the generation of spin-polarized current due to the spin Hall effect, using a multi-terminal quantum dot with spin-orbit interaction. The spin-polarization ratio is electrically tunable via gate voltages. (2) The Kondo effect has been studied in a quantum dot embedded in a small ring. We have elucidated the ring-size dependence of the Kondo effect, inelastic processes in transport properties, and information on the electron phase detected in the multi-terminal geometry. (3) The anisotropic g-factors in InAs quantum dot and anomalous Josephson effect observed in InSb nanowires have been explained, taking into account the spin-orbit interaction.
|
