Reentrant superconductivity in a quantum dot coupled to a Sachdev-Ye-Kitaev metal

Cheipesh, Y.; Pavlov, A. I.; Scopelliti, V.; Tworzydło, J.; Gnezdilov, N. V.

doi:10.1103/physrevb.100.220506

Title: Reentrant superconductivity in a quantum dot coupled to a Sachdev-Ye-Kitaev metal

Journal Article · 25 December 2019 · Physical Review B

DOI: https://doi.org/10.1103/physrevb.100.220506 · OSTI ID:1800568

Cheipesh, Y. ^[1]; Pavlov, A. I. ^[2]; Scopelliti, V. ^[3]; Tworzydło, J. ^[4];

^[5]

Universiteit Leiden (Netherlands); OSTI
The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste (Italy); Leibniz-Institut für Festkörper und Werkstoffforschung, Dresden (Germany)
Universiteit Leiden (Netherlands)
Univ. of Warsaw (Poland)
Yale Univ., New Haven, CT (United States)

The Planckian relaxation rate $$ℏ/t_P = 2πk_BT$$ sets a characteristic timescale for both the equilibration of quantum critical systems and maximal quantum chaos. In this Rapid Communication, we show that at the critical coupling between a superconducting dot and the complex Sachdev-Ye-Kitaev model, known to be maximally chaotic, the pairing gap Δ behaves as $$η ℏ/t_P$$ at low temperatures, where $$\eta$$ is an order one constant. In this work, the lower critical temperature emerges with a further increase of the coupling strength so that the finite Δ domain is settled between the two critical temperatures.

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Research Organization:: Yale Univ., New Haven, CT (United States)

Sponsoring Organization:: European Research Council (ERC); Netherlands Organization for Scientific Research (NWO); USDOE Office of Science (SC)

Grant/Contract Number:: FG02-08ER46482

OSTI ID:: 1800568

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 22 Vol. 100; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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