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Josephson Junction π-0 Transition Induced by Orbital Hybridization in a Double Quantum Dot

Debbarma, Rousan LU ; Tsintzis, Athanasios LU ; Aspegren, Markus LU ; Souto, Rubén Seoane LU orcid ; Lehmann, Sebastian LU ; Dick, Kimberly LU ; Leijnse, Martin LU and Thelander, Claes LU (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
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organization
publishing date
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
2025-10-17 23:09:18
@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}},
}