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Portrait of Carina Fasth

Carina Fasth

Associate Professor

Portrait of Carina Fasth

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

Author

  • Stefano Roddaro
  • Andreas Fuhrer
  • Patrik Brusheim
  • Carina Fasth
  • Hongqi Xu
  • Lars Samuelson
  • J Xiang
  • C M Lieber

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

  • Solid State Physics

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