Phase tuning of multiple Andreev reflections of Dirac fermions and the Josephson supercurrent in Al–MoTe2–Al junctions
Abstract
When an electron is incident on a superconductor from a metal, it is reflected as a hole in a process called Andreev reflection. If the metal N is sandwiched between two superconductors S in an SNS junction, multiple Andreev reflections (MARs) occur. We have found that, in SNS junctions with high transparency (τ → 1) based on the Dirac semimetal MoTe2, the MAR features are observed with exceptional resolution. By tuning the phase difference φ between the bracketing Al superconductors, we establish that the MARs coexist with a Josephson supercurrent Is=IA sin φ. As we vary the junction voltage V, the supercurrent amplitude IA varies in step with the MAR order n, revealing a direct relation between them. Two successive Andreev reflections serve to shuttle a Cooper pair across the junction. If the pair is shuttled coherently, it contributes to Is. The experiment measures the fraction of pairs shuttled coherently vs. V. Surprisingly, superconductivity in MoTe2 does not affect the MAR features.
- Publication Date:
- Research Org.:
- Princeton Univ., NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF); Gordon and Betty Moore Foundation
- OSTI Identifier:
- 1904403
- Grant/Contract Number:
- SC0017863; DMR-2011750; GBMF9466; GBMF9064
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Volume: 119; Journal Issue: 28; Journal ID: ISSN 0027-8424
- Publisher:
- National Academy of Sciences
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; science & technology; superconductivity; topological; Andreev reflection; Josephson; Dirac semimetal
Citation Formats
Zhu, Zheyi, Kim, Stephan, Lei, Shiming, Schoop, Leslie M., Cava, R. J., and Ong, N. P. Phase tuning of multiple Andreev reflections of Dirac fermions and the Josephson supercurrent in Al–MoTe2–Al junctions. United States: N. p., 2022.
Web. doi:10.1073/pnas.2204468119.
Zhu, Zheyi, Kim, Stephan, Lei, Shiming, Schoop, Leslie M., Cava, R. J., & Ong, N. P. Phase tuning of multiple Andreev reflections of Dirac fermions and the Josephson supercurrent in Al–MoTe2–Al junctions. United States. https://doi.org/10.1073/pnas.2204468119
Zhu, Zheyi, Kim, Stephan, Lei, Shiming, Schoop, Leslie M., Cava, R. J., and Ong, N. P. Fri .
"Phase tuning of multiple Andreev reflections of Dirac fermions and the Josephson supercurrent in Al–MoTe2–Al junctions". United States. https://doi.org/10.1073/pnas.2204468119. https://www.osti.gov/servlets/purl/1904403.
@article{osti_1904403,
title = {Phase tuning of multiple Andreev reflections of Dirac fermions and the Josephson supercurrent in Al–MoTe2–Al junctions},
author = {Zhu, Zheyi and Kim, Stephan and Lei, Shiming and Schoop, Leslie M. and Cava, R. J. and Ong, N. P.},
abstractNote = {When an electron is incident on a superconductor from a metal, it is reflected as a hole in a process called Andreev reflection. If the metal N is sandwiched between two superconductors S in an SNS junction, multiple Andreev reflections (MARs) occur. We have found that, in SNS junctions with high transparency (τ → 1) based on the Dirac semimetal MoTe2, the MAR features are observed with exceptional resolution. By tuning the phase difference φ between the bracketing Al superconductors, we establish that the MARs coexist with a Josephson supercurrent Is=IA sin φ. As we vary the junction voltage V, the supercurrent amplitude IA varies in step with the MAR order n, revealing a direct relation between them. Two successive Andreev reflections serve to shuttle a Cooper pair across the junction. If the pair is shuttled coherently, it contributes to Is. The experiment measures the fraction of pairs shuttled coherently vs. V. Surprisingly, superconductivity in MoTe2 does not affect the MAR features.},
doi = {10.1073/pnas.2204468119},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 28,
volume = 119,
place = {United States},
year = {Fri Jul 08 00:00:00 EDT 2022},
month = {Fri Jul 08 00:00:00 EDT 2022}
}
Free Publicly Available Full Text
Publisher's Version of Record
Other availability
Search WorldCat to find libraries that may hold this journal
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.
Works referenced in this record:
Evidence for Long-Lived Quasiparticles Trapped in Superconducting Point Contacts
journal, June 2011
- Zgirski, M.; Bretheau, L.; Le Masne, Q.
- Physical Review Letters, Vol. 106, Issue 25
Evidence for an edge supercurrent in the Weyl superconductor MoTe 2
journal, April 2020
- Wang, Wudi; Kim, Stephan; Liu, Minhao
- Science, Vol. 368, Issue 6490
Theory of Subharmonic Gap Structure in Superconducting Mesoscopic Tunnel Contacts
journal, March 1995
- Bratus', E. N.; Shumeiko, V. S.; Wendin, G.
- Physical Review Letters, Vol. 74, Issue 11
Andreev Reflection in Weyl Semimetals
journal, June 2014
- Uchida, Shuhei; Habe, Tetsuro; Asano, Yasuhiro
- Journal of the Physical Society of Japan, Vol. 83, Issue 6
Theory of quantum conduction of supercurrent through a constriction
journal, July 1991
- Furusaki, Akira; Takayanagi, Hideaki; Tsukada, Masaru
- Physical Review Letters, Vol. 67, Issue 1
Specular Andreev Reflection in Graphene
journal, August 2006
- Beenakker, C. W. J.
- Physical Review Letters, Vol. 97, Issue 6
Topological insulators with inversion symmetry
journal, July 2007
- Fu, Liang; Kane, C. L.
- Physical Review B, Vol. 76, Issue 4
structure of Pb-PbO-Pb tunnel junctions
journal, January 1966
- Marcus, S. M.
- Physics Letters, Vol. 19, Issue 8
Andreev bound states in supercurrent-carrying carbon nanotubes revealed
journal, November 2010
- Pillet, J-D.; Quay, C. H. L.; Morfin, P.
- Nature Physics, Vol. 6, Issue 12
Josephson current carried by Andreev levels in superconducting quantum point contacts
journal, May 1999
- Furusaki, Akira
- Superlattices and Microstructures, Vol. 25, Issue 5-6
Josephson current through a superconducting quantum point contact shorter than the coherence length
journal, June 1991
- Beenakker, C. W. J.; van Houten, H.
- Physical Review Letters, Vol. 66, Issue 23
Ballistic edge states in Bismuth nanowires revealed by SQUID interferometry
journal, July 2017
- Murani, Anil; Kasumov, Alik; Sengupta, Shamashis
- Nature Communications, Vol. 8, Issue 1
Quantum Interference Properties of Double Josephson Junctions
journal, August 1972
- Fulton, T. A.; Dunkleberger, L. N.; Dynes, R. C.
- Physical Review B, Vol. 6, Issue 3
Induced superconductivity in the quantum spin Hall edge
journal, August 2014
- Hart, Sean; Ren, Hechen; Wagner, Timo
- Nature Physics, Vol. 10, Issue 9
Signatures of topological Josephson junctions
journal, August 2016
- Peng, Yang; Pientka, Falko; Berg, Erez
- Physical Review B, Vol. 94, Issue 8
The ω-SQUIPT as a tool to phase-engineer Josephson topological materials
journal, September 2016
- Strambini, E.; D'Ambrosio, S.; Vischi, F.
- Nature Nanotechnology, Vol. 11, Issue 12
Bipolar supercurrent in graphene
journal, March 2007
- Heersche, Hubert B.; Jarillo-Herrero, Pablo; Oostinga, Jeroen B.
- Nature, Vol. 446, Issue 7131
Hamiltonian approach to the transport properties of superconducting quantum point contacts
journal, September 1996
- Cuevas, J. C.; Martín-Rodero, A.; Yeyati, A. Levy
- Physical Review B, Vol. 54, Issue 10
Josephson current and multiple Andreev reflections in graphene SNS junctions
journal, May 2008
- Du, Xu; Skachko, Ivan; Andrei, Eva Y.
- Physical Review B, Vol. 77, Issue 18
Multiple Andreev reflection and critical current in topological superconducting nanowire junctions
journal, July 2013
- San-Jose, Pablo; Cayao, Jorge; Prada, Elsa
- New Journal of Physics, Vol. 15, Issue 7
Berry's Phase and Absence of Back Scattering in Carbon Nanotubes
journal, August 1998
- Ando, Tsuneya; Nakanishi, Takeshi; Saito, Riichiro
- Journal of the Physical Society of Japan, Vol. 67, Issue 8
Chiral tunnelling and the Klein paradox in graphene
journal, August 2006
- Katsnelson, M. I.; Novoselov, K. S.; Geim, A. K.
- Nature Physics, Vol. 2, Issue 9
Physics and Applications of the Josephson Effect
book, July 1982
- Barone, Antonio; Paternò, Gianfranco
ac Josephson Effect in a Single Quantum Channel
journal, August 1995
- Averin, D.; Bardas, A.
- Physical Review Letters, Vol. 75, Issue 9
Excess Currents in Electron Tunneling Between Superconductors
journal, January 1963
- Taylor, B. N.; Burstein, E.
- Physical Review Letters, Vol. 10, Issue 1
Quantum-interference phenomena in point contacts between two superconductors
journal, February 1969
- de Waele, A. Th. A. M.; de Bruyn Ouboter, R.
- Physica, Vol. 41, Issue 2