標題: Spin transport from doublet state to triplet state in vertical quantum dots
作者: Huang, Shiu-Ming
Akimoto, Hikota
Kono, Kimitoshi
Lin, Juhn-Jong
Tarucha, Seigo
Ono, Keiji
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
關鍵字: quantum dot;spin selection rule
公開日期: 1-Apr-2008
摘要: We measured electron transport state spectra of an In(0.05)Ga(0.95)As vertical double quantum dot. Both the ground and excited states of transport spectra from two electrons to three electrons are measured using a large source-drain voltage. In the obtained transition spectrum, the ground state transition from the 1S(2) singlet state to the 1S2P triplet state is observed at 5 T. Zeeman splitting with a g-factor of 0.36 is clearly observed at magnetic fields higher than 5 T. The observation of two Zeeman sublevels instead of three for the triplet state is explained by the spin selection rules for the S(Z) components between the two-electron and three-electron spin states. Transition with the total spin difference between the initial and final states larger than 1/2 is forbidden. Because the transition between doublet states is much longer than electron tunneling, both spin up and spin down can be the initial states from spin transitions. There are four transitions contributing to tunneling processes, but only two energy differences lead to the two Zeeman sublevels in the excitation spectra.
URI: http://dx.doi.org/10.1143/JJAP.47.3257
http://hdl.handle.net/11536/29654
ISSN: 0021-4922
DOI: 10.1143/JJAP.47.3257
期刊: JAPANESE JOURNAL OF APPLIED PHYSICS
Volume: 47
Issue: 4
起始頁: 3257
結束頁: 3260
Appears in Collections:Conferences Paper


Files in This Item:

  1. 000255449100206.pdf