Josephson current via spin and orbital states of a tunable double quantum dot
Rousan Debbarma, Markus Aspegren, Florinda Viñas Boström, Sebastian Lehmann, Kimberly Dick, Claes Thelander
DOI 10.1103/PhysRevB.106.L180507 · Physical Review B
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Abstract
Supercurrent transport is experimentally studied in a Josephson junction hosting a double quantum dot (DQD) with tunable symmetries. The QDs are parallel coupled to two superconducting contacts and can be tuned between strong interdot hybridization and a ring geometry where hybridization is suppressed. In both cases, we observe supercurrents when the two interacting orbitals are either empty or filled with spins, or a combination. However, when each QD hosts an unpaired spin, the supercurrent depends on the spin ground state. It is strongly suppressed for the ring geometry with a spin-triplet ground state at zero external magnetic field. By increasing the QD hybridization, we find that a supercurrent appears when the ground state changes to spin singlet. In general, supercurrents are suppressed in cases of spin-doublet ground state, but an exception occurs at orbital degeneracy when the system hosts one additional spin, as opposed to three, pointing to a broken particle-hole symmetry.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ti/Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | onset |
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