Current-induced spin polarization in a two-dimensional hole gas

Chaoxing Liu, Bin Zhou, Shun Qing Shen, Bang Fen Zhu

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We investigate the current-induced spin polarization in the two-dimensional hole gas (2DHG) with the structure inversion asymmetry. By using the perturbation theory, we rederive the effective k -cubic Rashba Hamiltonian for 2DHG and the generalized spin operators accordingly. Then based on the linear response theory, we analytically and numerically calculate the current-induced spin polarization with the disorder effect considered. We have found that, quite different from the two-dimensional electron gas, the spin polarization in 2DHG linearly depends on Fermi energy in the low-doping regime, and with increasing Fermi energy, the spin polarization may be suppressed and even changes its sign. We predict a pronounced peak of the spin polarization in 2DHG once the Fermi level is somewhere between the minimum points of two spin-split branches of the lowest light-hole subband. We discuss the possibility of measurements in experiments as regards the temperature and the width of quantum wells.

Original languageEnglish (US)
Article number125345
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number12
DOIs
StatePublished - Mar 31 2008

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Spin polarization
Induced currents
Gases
Fermi level
polarization
gases
Hamiltonians
Two dimensional electron gas
Semiconductor quantum wells
Mathematical operators
Doping (additives)
electron gas
perturbation theory
asymmetry
quantum wells
disorders
inversions
operators
energy
Experiments

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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Current-induced spin polarization in a two-dimensional hole gas. / Liu, Chaoxing; Zhou, Bin; Shen, Shun Qing; Zhu, Bang Fen.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 77, No. 12, 125345, 31.03.2008.

Research output: Contribution to journalArticle

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AU - Zhou, Bin

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AU - Zhu, Bang Fen

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