Kocsis, Mátyás and Scherübl, Zoltán and Fülöp, Gergő and Makk, Péter and Csonka, Szabolcs (2024) Strong nonlocal tuning of the current-phase relation of a quantum dot based Andreev molecule. PHYSICAL REVIEW B, 109 (24). No.-245133. ISSN 2469-9950
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Abstract
Recent realization of minimal Kitaev chains brought a breakthrough in Majorana research, which made arrays of quantum dots coupled by superconductor spacers the most promising synthetic quantum material for topological quantum architectures. In this paper, we investigate the basic building block of this platform-two dots coupled via a superconductor (referred to as an Andreev molecule)-in a configuration where two superconducting (SC) loops are created to tune the SC phase difference across the dots. This enables us to consider Coulomb interactions which was not possible in previously studied systems. We demonstrate that the Andreev molecule shows a strong nonlocal Josephson effect: As the dot in one junction is tuned, the current-phase relation (CPR) of the other dot is modified. This architecture hosts 0-pi transitions and shows a tunable anomalous phi 0 phase shift, nonlocally controlled in both cases, without relying on spin-orbit interaction or Zeeman fields used in previous studies. In addition, a significant SC diode effect and pi -periodic CPRs can be observed. The presented nonlocal CPR can be used as a signature of the formation of an Andreev molecular state and in general to introduce ways to tune quantum architectures.
| Item Type: | Article |
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| Additional Information: | Funding Agency and Grant Number: SuperGate Fet Open; FET Open AndQC; Twistrain ERC; OTKA [FK-132146, K-138433, K-134437]; Ministry of Culture and Innovation; National Research, Development and Innovation Office within the Quantum Information National Laboratory of Hungary [2022-2.1.1-NL-2022-00004, TKP2021-NVA-02, NKP-22-5]; New National Excellence Program of the Ministry for Culture and Innovation from the source of the National Research, Development and Innovation Fund [NKP-23-5-BME-413]; Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences; EIC Pathfinder Challenge grant QuKiT [101115315] Funding text: The authors declare no competing financial or nonfinancial interests. This paper has received funding from SuperGate Fet Open, the FET Open AndQC, Twistrain ERC, and from the OTKA Grants No. FK-132146, No. K-138433, and No. K-134437. This paper was supported by the Ministry of Culture and Innovation and the National Research, Development and Innovation Office within the Quantum Information National Laboratory of Hungary (Grant No. 2022-2.1.1-NL-2022-00004) , Grant No. TKP2021-NVA-02, by the & Uacute;NKP-22-5, and the & Uacute;NKP-23-5-BME-413 New National Excellence Program of the Ministry for Culture and Innovation from the source of the National Research, Development and Innovation Fund, the Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences, and the EIC Pathfinder Challenge grant QuKiT (Grant No. 101115315) . M.K. developed the simulations with the help of G.F. and Z.S. M.K. ran the simulations and visualizations. P.M. and Sz. Cs. supervised the work. All authors analyzed and discussed the results and contributed to the manuscript. |
| Uncontrolled Keywords: | BOUND-STATES; Materials Science, Multidisciplinary; Physics, Applied; |
| Subjects: | Q Science / természettudomány > QC Physics / fizika |
| SWORD Depositor: | MTMT SWORD |
| Depositing User: | MTMT SWORD |
| Date Deposited: | 05 Sep 2024 07:53 |
| Last Modified: | 05 Sep 2024 07:53 |
| URI: | https://real.mtak.hu/id/eprint/204245 |
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