| Original Articles |
|
|
|
|
Spin Pumping from a Quantum Dot in the Presence of Decoherence |
| XIONG Yong-Jian;GE Sen-Quan |
| Key Laboratory of Nano Materials of Ningbo, Department of Physics, Ningbo University, Ningbo 315211 |
|
| Cite this article: |
|
XIONG Yong-Jian, GE Sen-Quan 2008 Chin. Phys. Lett. 25 1854-1856 |
|
|
|
Abstract We study the pumped spin current of an interacting quantum dot tunnel
coupled to a single lead in the presence of electron spin resonance (ESR) field. The spin decoherence in the dot is included by the Buttiker approach. Using the nonequilibrium Green's function technique, we show that ESR-induced spin flip can generate finite spin current with no charge transport. Both the Coulomb interaction and spin decoherence decrease the amplitude of spin current. The dependence of pumped spin current on the intensity and frequency of ESR field, and the spin decoherence is discussed.
|
| Keywords:
73.63.Kv
72.25.Pn
73.23.Hk
|
|
|
Received: 24 January 2008
Published: 29 April 2008
|
|
| PACS: |
73.63.Kv
|
(Quantum dots)
|
| |
72.25.Pn
|
(Current-driven spin pumping)
|
| |
73.23.Hk
|
(Coulomb blockade; single-electron tunneling)
|
|
|
|
|
|
[1] For a recent review of experimental research on individualspin in quantum dots, see Hanson R, Kouwenhoven L P, Petta J R,Tarucha S and Vandersypen L M K 2007 Rev. Mod. Phys. 791217
[2] Awschalom D D, Loss D and Samarth N 2002 SemiconductorSpintronics and Quantum Computation (Berlin: Springer) Awschalom D D and Flatt\'{e M E 2007 Nat. Phys. 3 153
[3] Wang B G, Wang J and Guo H 2003 Phys. Rev. B 67 92408
[4] Zhang P, Xue Q K and Xie X C 2003 Phys. Rev. Lett. 91 196602
[5] Dong B, Cui H L and Lei X L 2005 Phys. Rev. Lett. 94 66601
[6] B\"{uttiker M 1980 Phys. Rev. B 33 3020
[7] Wingreen N S, Jauho A P and Meir Y 1993 Phys. Rev. B 48 8487 Jauho A P, Wingreen N S and Meir Y 1994 ibid. 50 5528
[8] Blum K 1996 Density Matrix Theory and Applications (NewYork: Plenum) chap 8
[9] Xong Y J and Xiong S J 2002 Phys. Lett. A 330 628
[10] Recher P, Sukhorukov E V and Loss D 2000 Phys. Rev.Lett. 85 1962 Engel H A and Loss D 2001 Phys. Rev. Lett.. 86 4648 Engel H A and Loss D 2002 Phys. Rev. B 65 195321 |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
