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Spin States of holes in ge/si nanowire quantum dots.

Publiceringsår: 2008
Språk: Engelska
Publikation/Tidskrift/Serie: Physical Review Letters
Volym: 101
Nummer: 18
Dokumenttyp: Artikel i tidskrift
Förlag: American Physical Society


We investigate tunable hole quantum dots defined by surface gating Ge/Si core-shell nanowire heterostructures. In single level Coulomb-blockade transport measurements at low temperatures spin doublets are found, which become sequentially filled by holes. Magnetotransport measurements allow us to extract a g factor g;{*} approximately 2 close to the value of a free spin-1/2 particle in the case of the smallest dot. In less confined quantum dots smaller g factor values are observed. This indicates a lifting of the expected strong spin-orbit interaction effects in the valence band for holes confined in small enough quantum dots. By comparing the excitation spectrum with the addition spectrum we tentatively identify a hole exchange interaction strength chi approximately 130 mueV.


  • Condensed Matter Physics


  • ISSN: 1079-7114

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