Spin States of holes in ge/si nanowire quantum dots.
(2008) In Physical Review Letters 101(18).- Abstract
- 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... (More)
- 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1271623
- author
- Roddaro, Stefano LU ; Fuhrer, Andreas LU ; Brusheim, Patrik LU ; Fasth, Carina LU ; Xu, Hongqi LU ; Samuelson, Lars LU ; Xiang, J and Lieber, C M
- organization
- publishing date
- 2008
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review Letters
- volume
- 101
- issue
- 18
- article number
- 186802
- publisher
- American Physical Society
- external identifiers
-
- wos:000260574600051
- pmid:18999847
- scopus:55149088149
- ISSN
- 1079-7114
- DOI
- 10.1103/PhysRevLett.101.186802
- language
- English
- LU publication?
- yes
- id
- d4225370-708d-4e91-ab62-6dbc9fc6a34b (old id 1271623)
- date added to LUP
- 2016-04-01 12:07:44
- date last changed
- 2022-03-28 20:39:57
@article{d4225370-708d-4e91-ab62-6dbc9fc6a34b,
abstract = {{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.}},
author = {{Roddaro, Stefano and Fuhrer, Andreas and Brusheim, Patrik and Fasth, Carina and Xu, Hongqi and Samuelson, Lars and Xiang, J and Lieber, C M}},
issn = {{1079-7114}},
language = {{eng}},
number = {{18}},
publisher = {{American Physical Society}},
series = {{Physical Review Letters}},
title = {{Spin States of holes in ge/si nanowire quantum dots.}},
url = {{http://dx.doi.org/10.1103/PhysRevLett.101.186802}},
doi = {{10.1103/PhysRevLett.101.186802}},
volume = {{101}},
year = {{2008}},
}