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Hole weak anti-localization in a strained-Ge surface quantum well
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Mizokuchi, R., Torresani, P., Maurand, R., Zeng, Z., Niquet, Y.-M., Myronov, Maksym and De Franceschi, S. (2017) Hole weak anti-localization in a strained-Ge surface quantum well. Applied Physics Letters, 111 (6). 063102. doi:10.1063/1.4997411
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Official URL: http://dx.doi.org/10.1063/1.4997411
Abstract
We report a magneto-transport study of a two-dimensional hole gas confined to a strained Ge quantum well grown on a relaxed Si0.2Ge0.8 virtual substrate. The conductivity of the hole gas measured as a function of a perpendicular magnetic field exhibits a zero-field peak resulting from weak anti-localization. The peak develops and becomes stronger upon increasing the hole density by means of a top gate electrode. This behavior is consistent with a Rashba-type spin-orbit coupling whose strength is proportional to the perpendicular electric field and hence to the carrier density. In the low-density, the single-subband regime, by fitting the weak anti-localization peak to an analytic model, we extract the characteristic transport time scales and a spin splitting energy ΔSO∼ΔSO∼ 1 meV. Tight-binding calculations show that ΔSO is dominated by a cubic term in the in-plane wave vector. Finally, we observe a weak anti-localization peak also for magnetic fields parallel to the quantum well and associate this finding to an effect of intersubband scattering induced by interface defects.
| Item Type: | Journal Article | ||||||
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| Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| Divisions: | Faculty of Science > Physics | ||||||
| Library of Congress Subject Headings (LCSH): | Germanium, Silicon, Spintronics, Quantum wells | ||||||
| Journal or Publication Title: | Applied Physics Letters | ||||||
| Publisher: | American Institute of Physics | ||||||
| ISSN: | 0003-6951 | ||||||
| Official Date: | 8 August 2017 | ||||||
| Dates: |
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| Date of first compliant deposit: | 13 September 2017 | ||||||
| Volume: | 111 | ||||||
| Number: | 6 | ||||||
| Article Number: | 063102 | ||||||
| DOI: | 10.1063/1.4997411 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Funder: | France. Agence nationale de la recherche (ANR), European Research Council (ERC), Nanosciences Foundation | ||||||
| Grant number: | TOPONANO project (ANR), Grant No. 280043 (ERC) |
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