Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2000-06-30
Physica E 9, 31 (2001)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
To be published in Physica E, as part of the proceedings of the 11th International Winterschool on New Developments in Solid S
Scientific paper
10.1016/S1386-9477(00)00174-0
We present quantitative measurements and calculations of the spin-orbit induced zero-magnetic-field spin-splitting in two-dimensional (2D) hole systems in modulation-doped GaAs (311)A quantum wells. The results show that the splitting is large and tunable. In particular, via a combination of back- and front-gate biases, we can tune the splitting while keeping the 2D hole density constant. The data also reveal a surprising result regarding the magnetoresistance (Shubnikov-de Haas) oscillations in a 2D system with spin-split energy bands: the frequencies of the oscillations are {\it not} simply related to the population of the spin-subbands. Next we concentrate on the metallic-like behavior observed in these 2D holes and its relation to spin-splitting. The data indicate that the metallic behavior is more pronounced when two spin-subbands with unequal populations are occupied. Our measurements of the magnetoresistance of these 2D hole systems with an in-plane magnetic field corroborate this conclusion: while the system is metallic at zero magnetic field, it turns insulating when one of the spin-subbands is depopulated at high magnetic field.
de Poortere E. P.
Papadakis Stergios J.
Shayegan Mansour
Winkler Reinhard
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