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Lyatti M, Wolff MA, Gundareva I, Kruth M, Ferrari S, Dunin-Borkowski RE, Schuck C. Energy-level quantization and single-photon control of phase slips in YBa 2Cu 3O 7-x nanowires. Nat Commun 2020; 11:763. [PMID: 32034143 PMCID: PMC7005758 DOI: 10.1038/s41467-020-14548-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 01/08/2020] [Indexed: 11/09/2022] Open
Abstract
Significant progress has been made in superconducting quantum circuits. However new quantum devices that have longer decoherence times at higher temperatures are urgently required for quantum technologies. Superconducting nanowires with quantum phase slips are promising candidates for use in novel quantum devices. Here, we demonstrate YBa2Cu3O7-x nanowires with phase-slip dynamics and study their switching-current statistics at temperatures below 20 K. We apply theoretical models developed for Josephson junctions and show that our results provide strong evidence for energy-level quantization in the nanowires. The crossover temperature to the quantum regime of 12-13 K and the lifetime in the excited state exceeding 20 ms at 5.4 K are superior to those in conventional Josephson junctions. We also show how the absorption of a single photon changes the phase-slip and quantum state of a nanowire, which is important for the development of single-photon detectors with high operating temperature and superior temporal resolution.
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Affiliation(s)
- M Lyatti
- Institute of Physics, University of Münster, 48149, Münster, Germany. .,Kotelnikov IRE RAS, 125009, Moscow, Russia. .,PGI-5, Forschungszentrum Jülich, 52425, Jülich, Germany.
| | - M A Wolff
- Institute of Physics, University of Münster, 48149, Münster, Germany
| | - I Gundareva
- Kotelnikov IRE RAS, 125009, Moscow, Russia.,PGI-5, Forschungszentrum Jülich, 52425, Jülich, Germany
| | - M Kruth
- ER-C 2, Forschungszentrum Jülich, 52425, Jülich, Germany
| | - S Ferrari
- Institute of Physics, University of Münster, 48149, Münster, Germany
| | | | - C Schuck
- Institute of Physics, University of Münster, 48149, Münster, Germany
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Banerjee A, Mohapatra A, Ganesan R, Kumar PSA. Restoring Superconductivity in the Quantum Metal Phase of NbSe 2 Using Dissipative Coupling. NANO LETTERS 2019; 19:1625-1631. [PMID: 30735619 DOI: 10.1021/acs.nanolett.8b04538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Localization arguments forbid the appearance of a metallic ground state in two dimensions. Yet, a large variety of disordered superconductors are known to manifest an anomalous metal phase in the zero temperature limit. While previous observations were confined to noncrystalline "dirty" superconductors, the recent observation of the so-called Bose metal phase in crystalline thin flakes of NbSe2 has sparked off intense debate. While the exact nature of this phase remains unknown, it is thought that quantum fluctuations play a decisive role in Bose metal physics. In this work, we study the response of the anomalous metal phase in thin flakes of NbSe2 to dissipative coupling. We evince a dramatic quenching of the Bose metal phase when dissipative coupling is strong, fully restoring a zero resistance superconducting state in the entire region of the magnetic field (H)-temperature (T) phase diagram where the Bose metal phase is otherwise observed. The suppression of the Bose metal phase by dissipative coupling is possible only in a quantum system where dissipation can directly affect system thermodynamics. Our observation of a dissipative phase transition in two-dimensional NbSe2 firmly establishes the quantum nature of the anomalous metal phase in this class of "clean" superconductors.
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Affiliation(s)
- Abhishek Banerjee
- Department of Physics , Indian Institute of Science , Bengaluru 560012 , India
| | - Abhinab Mohapatra
- Department of Physics , Indian Institute of Science , Bengaluru 560012 , India
| | - R Ganesan
- Department of Physics , Indian Institute of Science , Bengaluru 560012 , India
| | - P S Anil Kumar
- Department of Physics , Indian Institute of Science , Bengaluru 560012 , India
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Baumans XDA, Zharinov VS, Raymenants E, Blanco Alvarez S, Scheerder JE, Brisbois J, Massarotti D, Caruso R, Tafuri F, Janssens E, Moshchalkov VV, Van de Vondel J, Silhanek AV. Statistics of localized phase slips in tunable width planar point contacts. Sci Rep 2017; 7:44569. [PMID: 28300182 PMCID: PMC5353587 DOI: 10.1038/srep44569] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Accepted: 02/09/2017] [Indexed: 11/09/2022] Open
Abstract
The main dissipation mechanism in superconducting nanowires arises from phase slips. Thus far, most of the studies focus on long nanowires where coexisting events appear randomly along the nanowire. In the present work we investigate highly confined phase slips at the contact point of two superconducting leads. Profiting from the high current crowding at this spot, we are able to shrink in-situ the nanoconstriction. This procedure allows us to investigate, in the very same sample, thermally activated phase slips and the probability density function of the switching current Isw needed to trigger an avalanche of events. Furthermore, for an applied current larger than Isw, we unveil the existence of two distinct thermal regimes. One corresponding to efficient heat removal where the constriction and bath temperatures remain close to each other, and another one in which the constriction temperature can be substantially larger than the bath temperature leading to the formation of a hot spot. Considering that the switching current distribution depends on the exact thermal properties of the sample, the identification of different thermal regimes is of utmost importance for properly interpreting the dissipation mechanisms in narrow point contacts.
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Affiliation(s)
- Xavier D A Baumans
- Experimental Physics of Nanostructured Materials, Q-MAT, CESAM, Université de Liège, B-4000 Sart Tilman, Belgium
| | - Vyacheslav S Zharinov
- INPAC-Institute for Nanoscale Physics and Chemistry, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
| | - Eline Raymenants
- INPAC-Institute for Nanoscale Physics and Chemistry, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
| | - Sylvain Blanco Alvarez
- Experimental Physics of Nanostructured Materials, Q-MAT, CESAM, Université de Liège, B-4000 Sart Tilman, Belgium
| | - Jeroen E Scheerder
- INPAC-Institute for Nanoscale Physics and Chemistry, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
| | - Jérémy Brisbois
- Experimental Physics of Nanostructured Materials, Q-MAT, CESAM, Université de Liège, B-4000 Sart Tilman, Belgium
| | - Davide Massarotti
- Dipartimento di Ingegneria Industriale e dell´ Informazione, Università degli Studi della Campania Luigi Vanvitelli, I-81031, Aversa, Ce, Italy.,CNR-SPIN UOS Napoli, Monte S.Angelo-via Cinthia, I-80126, Napoli, Italy
| | - Roberta Caruso
- CNR-SPIN UOS Napoli, Monte S.Angelo-via Cinthia, I-80126, Napoli, Italy.,Dipartimento di Fisica "E. Pancini", Università degli Studi di Napoli 'Federico II', Monte S.Angelo, I-80126 Napoli, Italy
| | - Francesco Tafuri
- CNR-SPIN UOS Napoli, Monte S.Angelo-via Cinthia, I-80126, Napoli, Italy.,Dipartimento di Fisica "E. Pancini", Università degli Studi di Napoli 'Federico II', Monte S.Angelo, I-80126 Napoli, Italy
| | - Ewald Janssens
- Laboratory of Solid State Physics and Magnetism, KU Leuven, B-3001, Leuven, Belgium
| | - Victor V Moshchalkov
- INPAC-Institute for Nanoscale Physics and Chemistry, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
| | - Joris Van de Vondel
- INPAC-Institute for Nanoscale Physics and Chemistry, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
| | - Alejandro V Silhanek
- Experimental Physics of Nanostructured Materials, Q-MAT, CESAM, Université de Liège, B-4000 Sart Tilman, Belgium
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Lin SZ, Bulaevskii LN. I-V characteristics of short superconducting nanowires with different bias and shunt: a dynamic approach. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:155703. [PMID: 24674877 DOI: 10.1088/0953-8984/26/15/155703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We derived the I-V characteristics of short nanowire in a circuit with and without resistive and inductive shunt. For this we used numerical calculations in the framework of time-dependent Ginzburg-Landau equations with different relaxation times for the amplitude and phase dynamics. We also derived the dependence of the I-V characteristics on flux in a superconducting quantum interference device made of two such weak links.
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Affiliation(s)
- Shi-Zeng Lin
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
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