Reentrant superconductivity in a quantum dot coupled to a Sachdev-Ye-Kitaev metal
| Autor: | Jakub Tworzydlo, N. V. Gnezdilov, Y. Cheipesh, Vincenzo Scopelliti, A. I. Pavlov |
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| Rok vydání: | 2019 |
| Předmět: |
Superconductivity
Physics Condensed matter physics Order (ring theory) 02 engineering and technology 021001 nanoscience & nanotechnology Coupling (probability) 01 natural sciences Quantum chaos Quantum dot Pairing 0103 physical sciences Domain (ring theory) 010306 general physics 0210 nano-technology Quantum |
| Zdroj: | Physical Review B. 100 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | The Planckian relaxation rate $\ensuremath{\hbar}/{t}_{\mathrm{P}}=2\ensuremath{\pi}{k}_{\mathrm{B}}T$ 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 $\mathrm{\ensuremath{\Delta}}$ behaves as $\ensuremath{\eta}\phantom{\rule{0.16em}{0ex}}\ensuremath{\hbar}/{t}_{\mathrm{P}}$ at low temperatures, where $\ensuremath{\eta}$ is an order one constant. The lower critical temperature emerges with a further increase of the coupling strength so that the finite $\mathrm{\ensuremath{\Delta}}$ domain is settled between the two critical temperatures. |
| Databáze: | OpenAIRE |
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