https://scholars.lib.ntu.edu.tw/handle/123456789/581017| Title: | Strain Effects on Rashba Spin-Orbit Coupling of 2D Hole Gases in GeSn/Ge Heterostructures | Authors: | Tai C.-T Chiu P.-Y Liu C.-Y Kao H.-S Harris C.T Lu T.-M Hsieh C.-T Chang S.-W Li J.-Y. JIUN-YUN LI |
Keywords: | Gases; Hole mobility; Quantum Hall effect; Spin orbit coupling; Confinement potential; Effects of strains; Phase coherence; Rashba spin-orbit coupling; Spin relaxation time; Spin splittings; Transport data; Weak localization; Germanium compounds | Issue Date: | 2021 | Source: | Advanced Materials | Abstract: | A demonstration of 2D hole gases in GeSn/Ge heterostructures with a mobility as high as 20 000?cm2 V?1 s?1 is given. Both the Shubnikov–de Haas oscillations and integer quantum Hall effect are observed, indicating high sample quality. The Rashba spin-orbit coupling (SOC) is investigated via magneto-transport. Further, a transition from weak localization to weak anti-localization is observed, which shows the tunability of the SOC strength by gating. The magneto-transport data are fitted to the Hikami–Larkin–Nagaoka formula. The phase-coherence and spin-relaxation times, as well as spin-splitting energy and Rashba coefficient of the k-cubic term, are extracted. The analysis reveals that the effects of strain and confinement potential at a high fraction of Sn suppress the Rashba SOC caused by the GeSn/Ge?heterostructures. ? 2021 Wiley-VCH GmbH |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85106248436&doi=10.1002%2fadma.202007862&partnerID=40&md5=0d44c72db235b181b6bc939faf87629d https://scholars.lib.ntu.edu.tw/handle/123456789/581017 |
ISSN: | 09359648 | DOI: | 10.1002/adma.202007862 |
| Appears in Collections: | 電機工程學系 |
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