Open AccessRelation between charge shot noise and spin polarization governed by Rashba spin orbit interaction
Author(s) -
Hua Chen,
Lan Du,
Zhuang Yi-Qi,
Niu Wen-Juan
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.5685
Subject(s) - shot noise , physics , spin polarization , condensed matter physics , scattering , polarization (electrochemistry) , spin–orbit interaction , quantum noise , spin (aerodynamics) , electron , quantum mechanics , optics , quantum , chemistry , detector , thermodynamics
When the Rashba spin orbit interaction is available the spin polarization along the spin quantization axis is derived form the spin density matrix with the help of current and shot noise formula based on the scattering theory. Charge shot noise and spin polarization are derived in the case of single channel and there exists no relation between them. Due to the difficulty in derivation in multichannel at least two channels the nonequilibrium Greens function technique is used to numerically compute the scattering matrix the current and the shot noise of clean two-dimensional electron gas governed by the spin orbit coupling effect. The relation between charge shot noise and spin polarization is investigated separately in conditions of variable bias spin orbit interaction coefficient and conductor length which demonstrates that the establishment of quantitive relation may provide a new way to realize all-electrical detection of spin polarization.