Spin States of holes in ge/si nanowire quantum dots.
Author
Summary, in English
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.
Department/s
Publishing year
2008
Language
English
Publication/Series
Physical Review Letters
Volume
101
Issue
18
Document type
Journal article
Publisher
American Physical Society
Topic
- Condensed Matter Physics
Status
Published
ISBN/ISSN/Other
- ISSN: 1079-7114