Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot
(2007) In Physical Review Letters 98. p.1-266801- Abstract
- We demonstrate control of the electron number down to the last electron in tunable few-electron quantum dots defined in catalytically grown InAs nanowires. Using low temperature transport spectroscopy in the Coulomb blockade regime, we propose a method to directly determine the magnitude of the spin-orbit interaction in a two-electron artificial atom with strong spin-orbit coupling. Because of a large effective g factor |g*|=8±1, the transition from a singlet S to a triplet T+ ground state with increasing magnetic field is dominated by the Zeeman energy rather than by orbital effects. We find that the spin-orbit coupling mixes the T+ and S states and thus induces an avoided crossing with magnitude ΔSO=0.25±0.05 meV. This allows us to... (More)
- We demonstrate control of the electron number down to the last electron in tunable few-electron quantum dots defined in catalytically grown InAs nanowires. Using low temperature transport spectroscopy in the Coulomb blockade regime, we propose a method to directly determine the magnitude of the spin-orbit interaction in a two-electron artificial atom with strong spin-orbit coupling. Because of a large effective g factor |g*|=8±1, the transition from a singlet S to a triplet T+ ground state with increasing magnetic field is dominated by the Zeeman energy rather than by orbital effects. We find that the spin-orbit coupling mixes the T+ and S states and thus induces an avoided crossing with magnitude ΔSO=0.25±0.05 meV. This allows us to calculate the spin-orbit length λSO≈127 nm in such systems using a simple model. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/642631
- author
- Fasth, Carina LU ; Fuhrer, Andreas LU ; Samuelson, Lars LU ; Golovach, Vitaly and Loss, Daniel
- organization
- publishing date
- 2007
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review Letters
- volume
- 98
- pages
- 1 - 266801
- publisher
- American Physical Society
- external identifiers
-
- wos:000247625100048
- scopus:34547342695
- pmid:17678116
- ISSN
- 1079-7114
- DOI
- 10.1103/PhysRevLett.98.266801
- language
- English
- LU publication?
- yes
- id
- a14ccdfe-24b2-477e-8275-6a81de3c99c7 (old id 642631)
- date added to LUP
- 2016-04-04 12:13:47
- date last changed
- 2022-04-08 08:23:49
@article{a14ccdfe-24b2-477e-8275-6a81de3c99c7, abstract = {{We demonstrate control of the electron number down to the last electron in tunable few-electron quantum dots defined in catalytically grown InAs nanowires. Using low temperature transport spectroscopy in the Coulomb blockade regime, we propose a method to directly determine the magnitude of the spin-orbit interaction in a two-electron artificial atom with strong spin-orbit coupling. Because of a large effective g factor |g*|=8±1, the transition from a singlet S to a triplet T+ ground state with increasing magnetic field is dominated by the Zeeman energy rather than by orbital effects. We find that the spin-orbit coupling mixes the T+ and S states and thus induces an avoided crossing with magnitude ΔSO=0.25±0.05 meV. This allows us to calculate the spin-orbit length λSO≈127 nm in such systems using a simple model.}}, author = {{Fasth, Carina and Fuhrer, Andreas and Samuelson, Lars and Golovach, Vitaly and Loss, Daniel}}, issn = {{1079-7114}}, language = {{eng}}, pages = {{1--266801}}, publisher = {{American Physical Society}}, series = {{Physical Review Letters}}, title = {{Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot}}, url = {{http://dx.doi.org/10.1103/PhysRevLett.98.266801}}, doi = {{10.1103/PhysRevLett.98.266801}}, volume = {{98}}, year = {{2007}}, }