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TT: Fachverband Tiefe Temperaturen

TT 22: Quantum Dots, Quantum Wires, Point Contacts

TT 22.9: Vortrag

Dienstag, 17. März 2020, 11:45–12:00, HSZ 201

Single-photon pump by Cooper-pair splitting — Mattia Mantovani, Wolfgang Belzig, Gianluca Rastelli, and •Robert Hussein — Fachbereich Physik, Universität Konstanz, Germany

Cooper-pairs are a source of correlated electrons and their nonlocal breaking can be used in entanglement generation [1,2], thermoelectric transport [3], and spin-current-control [4]. Here, we consider a hybrid superconductor-double-quantum-dot system as a Cooper-pair splitter. By coupling each quantum dot to an electromagnetic or mechanical resonator, one can simultaneously cool down both resonators into their ground state [5]. We demonstrate that the process of cross-Andreev reflection can additionally be employed to coherently transfer single photons, and therewith heat, between these two distant resonators, realizing an efficient photon bus. The proposed scheme has further potential applications in quantum heat engines and refrigerators

[1] R. Hussein, L. Jaurigue, M. Governale, and A. Braggio, Phys. Rev. B 94, 235134 (2016).

[2] R. Hussein, A. Braggio, and M. Governale, Phys. Status Solidi B 254, 1600603 (2017).

[3] R. Hussein, M. Governale, S. Kohler, W. Belzig, F. Giazotto, and A. Braggio, Phys. Rev. B 99, 075429 (2019).

[4] A. Rezaei, R. Hussein, A. Kamra, and W. Belzig, arXiv:1908.09610.

[5] M. Mantovani, W. Belzig, G. Rastelli, and R. Hussein, Phys. Rev. Research 1, 033098 (2019).