Conductivity of a spin-polarized two-dimensional hole gas at very low temperature

In the ballistic regime where kBTτ / ħ ≥1, the temperature dependence of the metallic conductivity in a two-dimensional hole system of gallium arsenide, is found to change non-monotonically with the degree of spin polarization. In particular, it fades away just before the onset of complete spin pola...

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Bibliographic Details
Main Authors: Dlimi, S, El, Kaaouachi A, Limouny, L, El, Idrissi H, Zatni, A, Sybous, A, Narjis, A, Errai, M, Daoudi, E
Format: Conference Proceeding
Language:English
Subjects:
Arsenides
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Conductivity
ELECTRONS
Gallium arsenide
GALLIUM ARSENIDES
INTERACTIONS
MAGNETIC FIELDS
Polarization (spin alignment)
RELAXATION TIME
SPIN ORIENTATION
TEMPERATURE DEPENDENCE
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Summary:In the ballistic regime where kBTτ / ħ ≥1, the temperature dependence of the metallic conductivity in a two-dimensional hole system of gallium arsenide, is found to change non-monotonically with the degree of spin polarization. In particular, it fades away just before the onset of complete spin polarization, but reappears again in the fully spin-polarized state, being, however, suppressed relative to the zero magnetic field case. The analysis of the degree of suppression can distinguish between screening and interaction-based theories. We show that in a fully polarized spin state, the effects of disorder are dominant and approach a strong localization regime, which is contrary to the behavior of 2D electron systems in a weakly disordered unpolarized state. It was found that the elastic relaxation time correction, depending on the temperature, changed significantly with the degree of spin polarization, to reach a minimum just below the start of the spin-polarized integer, where the conductivity is practically independent of temperature.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4860642