Spectroscopy and level detuning of few-electron spin states in parallel InAs quantum dots
(2018) In Physical Review B 98(24).- Abstract
We use tunneling spectroscopy to study the evolution of few-electron spin states in parallel InAs nanowire double quantum dots (QDs) as a function of level detuning and applied magnetic field. Compared to the much more studied serial configuration, parallel coupling of the QDs to source and drain greatly expands the probing range of excited-state transport. Owing to a strong confinement, we can here isolate transport involving only the very first interacting single QD orbital pair. For the (2,0)-(1,1) charge transition, with relevance for spin-based qubits, we investigate the excited (1,1) triplet, and hybridization of the (2,0) and (1,1) singlets. An applied magnetic field splits the (1,1) triplet, and due to spin-orbit induced mixing... (More)
We use tunneling spectroscopy to study the evolution of few-electron spin states in parallel InAs nanowire double quantum dots (QDs) as a function of level detuning and applied magnetic field. Compared to the much more studied serial configuration, parallel coupling of the QDs to source and drain greatly expands the probing range of excited-state transport. Owing to a strong confinement, we can here isolate transport involving only the very first interacting single QD orbital pair. For the (2,0)-(1,1) charge transition, with relevance for spin-based qubits, we investigate the excited (1,1) triplet, and hybridization of the (2,0) and (1,1) singlets. An applied magnetic field splits the (1,1) triplet, and due to spin-orbit induced mixing with the (2,0) singlet we clearly resolve transport through all triplet states near the avoided singlet-triplet crossings. Transport calculations, based on a simple model with one orbital on each QD, fully replicate the experimental data. Finally, we observe an expected mirrored symmetry between the one- to two-electron and two- to three-electron transitions resulting from the twofold spin degeneracy of the orbitals.
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- author
- Thelander, Claes LU ; Nilsson, Malin LU ; Viñas Boström, Florinda LU ; Burke, Adam LU ; Lehmann, Sebastian LU ; Dick, Kimberly A. LU and Leijnse, Martin LU
- organization
- publishing date
- 2018-12-10
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B
- volume
- 98
- issue
- 24
- article number
- 245305
- publisher
- American Physical Society
- external identifiers
-
- scopus:85058310282
- ISSN
- 2469-9950
- DOI
- 10.1103/PhysRevB.98.245305
- language
- English
- LU publication?
- yes
- id
- 7f057b5a-a1f7-44fe-8757-48dc3c3df97a
- date added to LUP
- 2019-01-03 12:58:27
- date last changed
- 2023-10-20 19:35:21
@article{7f057b5a-a1f7-44fe-8757-48dc3c3df97a, abstract = {{<p>We use tunneling spectroscopy to study the evolution of few-electron spin states in parallel InAs nanowire double quantum dots (QDs) as a function of level detuning and applied magnetic field. Compared to the much more studied serial configuration, parallel coupling of the QDs to source and drain greatly expands the probing range of excited-state transport. Owing to a strong confinement, we can here isolate transport involving only the very first interacting single QD orbital pair. For the (2,0)-(1,1) charge transition, with relevance for spin-based qubits, we investigate the excited (1,1) triplet, and hybridization of the (2,0) and (1,1) singlets. An applied magnetic field splits the (1,1) triplet, and due to spin-orbit induced mixing with the (2,0) singlet we clearly resolve transport through all triplet states near the avoided singlet-triplet crossings. Transport calculations, based on a simple model with one orbital on each QD, fully replicate the experimental data. Finally, we observe an expected mirrored symmetry between the one- to two-electron and two- to three-electron transitions resulting from the twofold spin degeneracy of the orbitals.</p>}}, author = {{Thelander, Claes and Nilsson, Malin and Viñas Boström, Florinda and Burke, Adam and Lehmann, Sebastian and Dick, Kimberly A. and Leijnse, Martin}}, issn = {{2469-9950}}, language = {{eng}}, month = {{12}}, number = {{24}}, publisher = {{American Physical Society}}, series = {{Physical Review B}}, title = {{Spectroscopy and level detuning of few-electron spin states in parallel InAs quantum dots}}, url = {{http://dx.doi.org/10.1103/PhysRevB.98.245305}}, doi = {{10.1103/PhysRevB.98.245305}}, volume = {{98}}, year = {{2018}}, }