Josephson Junction π-0 Transition Induced by Orbital Hybridization in a Double Quantum Dot
(2023) In Physical Review Letters 131(25).- Abstract
In this Letter, we manipulate the phase shift of a Josephson junction using a parallel double quantum dot (QD). By employing a superconducting quantum interference device, we determine how orbital hybridization and detuning affect the current-phase relation in the Coulomb blockade regime. For weak hybridization between the QDs, we find π junction characteristics if at least one QD has an unpaired electron. Notably the critical current is higher when both QDs have an odd electron occupation. By increasing the inter-QD hybridization the critical current is reduced, until eventually a π-0 transition occurs. A similar transition appears when detuning the QD levels at finite hybridization. Based on a zero-bandwidth model, we argue that both... (More)
In this Letter, we manipulate the phase shift of a Josephson junction using a parallel double quantum dot (QD). By employing a superconducting quantum interference device, we determine how orbital hybridization and detuning affect the current-phase relation in the Coulomb blockade regime. For weak hybridization between the QDs, we find π junction characteristics if at least one QD has an unpaired electron. Notably the critical current is higher when both QDs have an odd electron occupation. By increasing the inter-QD hybridization the critical current is reduced, until eventually a π-0 transition occurs. A similar transition appears when detuning the QD levels at finite hybridization. Based on a zero-bandwidth model, we argue that both cases of phase-shift transitions can be understood considering an increased weight of states with a double occupancy in the ground state and with the Cooper pair transport dominated by local Andreev reflection.
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- author
- Debbarma, Rousan LU ; Tsintzis, Athanasios LU ; Aspegren, Markus LU ; Souto, Rubén Seoane LU ; Lehmann, Sebastian LU ; Dick, Kimberly LU ; Leijnse, Martin LU and Thelander, Claes LU
- organization
- publishing date
- 2023-12-22
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review Letters
- volume
- 131
- issue
- 25
- article number
- 256001
- pages
- 6 pages
- publisher
- American Physical Society
- external identifiers
-
- pmid:38181374
- scopus:85181005288
- ISSN
- 0031-9007
- DOI
- 10.1103/PhysRevLett.131.256001
- language
- English
- LU publication?
- yes
- id
- 9b5de30f-206e-40b7-90b1-a23778e67f01
- date added to LUP
- 2024-01-17 15:02:38
- date last changed
- 2024-04-17 18:58:22
@article{9b5de30f-206e-40b7-90b1-a23778e67f01, abstract = {{<p>In this Letter, we manipulate the phase shift of a Josephson junction using a parallel double quantum dot (QD). By employing a superconducting quantum interference device, we determine how orbital hybridization and detuning affect the current-phase relation in the Coulomb blockade regime. For weak hybridization between the QDs, we find π junction characteristics if at least one QD has an unpaired electron. Notably the critical current is higher when both QDs have an odd electron occupation. By increasing the inter-QD hybridization the critical current is reduced, until eventually a π-0 transition occurs. A similar transition appears when detuning the QD levels at finite hybridization. Based on a zero-bandwidth model, we argue that both cases of phase-shift transitions can be understood considering an increased weight of states with a double occupancy in the ground state and with the Cooper pair transport dominated by local Andreev reflection.</p>}}, author = {{Debbarma, Rousan and Tsintzis, Athanasios and Aspegren, Markus and Souto, Rubén Seoane and Lehmann, Sebastian and Dick, Kimberly and Leijnse, Martin and Thelander, Claes}}, issn = {{0031-9007}}, language = {{eng}}, month = {{12}}, number = {{25}}, publisher = {{American Physical Society}}, series = {{Physical Review Letters}}, title = {{Josephson Junction π-0 Transition Induced by Orbital Hybridization in a Double Quantum Dot}}, url = {{http://dx.doi.org/10.1103/PhysRevLett.131.256001}}, doi = {{10.1103/PhysRevLett.131.256001}}, volume = {{131}}, year = {{2023}}, }