Hybrid Superconductor - Ge/Si core/shell nanowire devices

2016 Fiscal Year Annual Research Report

• Project/Area Number: 26790008
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: ディーコン ラッセル 国立研究開発法人理化学研究所, 石橋極微デバイス工学研究室, 研究員 (40552443)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 超電導

Outline of Annual Research Achievements

We completed a detailed study of the weak anti-localization in Ge/Si nanowires using dual top and bottom gates and thin Hafnium dielectric. Results indicate a three fold electrical tunability of the strength of spin orbit interaction with a large Rashba coefficient, providing strong evidence for an electric dipole coupled Rashba spin-orbit interaction. We produced Ge/Si double quantum dot devices coupled to microwave cavities, with hBN as a gate dielectric, to study spin-photon coupling and succeed in the dispersive readout of charge states. We developed a new method to measure Josephson emission from voltage biased junctions to search for Majorana modes. This techniques we applied successfully to the HgTe based quantum spin hall insulator system [Phys. Rev. X, 7, 021011, 2017].

Research Products

• [Journal Article] Josephson Radiation from Gapless Andreev Bound States in HgTe-Based Topological Junctions (2017)
  • Author(s): R.S. Deacon, J. Wiedenmann, E. Bocquillon, F. Dominguez, T.M. Klapwijk, P. Leubner, C. Brune, E.M. Hankiewicz, S. Tarucha, K. Ishibashi, H. Buhmann, and L.W. Molenkamp
  • Journal Title: Physical Review X Volume: 7 Pages: 021011
  • DOI: https://doi.org/10.1103/PhysRevX.7.021011
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Josephson junction dynamics in the presence of 2\pi- and 4\pi-periodic supercurrents (2017)
  • Author(s): F. Domínguez, O. Kashuba, E. Bocquillon, J. Wiedenmann, R. S. Deacon, T. M. Klapwijk, G. Platero, L. W. Molenkamp, B. Trauzettel, and E. M. Hankiewicz
  • Journal Title: Physical Review B Volume: pending Pages: pending
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] InSb nanowire double quantum dots coupled to a superconducting microwave cavity (2016)
  • Author(s): R. Wang, R.S. Deacon, D. Carr, E.P.A.M. Bakkers, and K. Ishibashi
  • Journal Title: Applied Physics Letters Volume: 108 Pages: 203502-
  • DOI: http://dx.doi.org/10.1063/1.4950764
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] 4π-periodic Josephson supercurrent in HgTe-based topological Josephson junctions (2016)
  • Author(s): J. Wiedenmann, E. Bocquillon, R. S. Deacon, S. Hartinger, O. Herrmann, T. M. Klapwijk, L. Maier, C. Ames, C. Brüne, C. Gould, A. Oiwa, K. Ishibashi, S. Tarucha, H. Buhmann, and L. W. Molenkamp
  • Journal Title: Nature Communications Volume: 7 Pages: 10303
  • DOI: doi:10.1038/ncomms10303
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Gapless Andreev bound states in the quantum spin Hall insulator HgTe (2016)
  • Author(s): Erwann Bocquillon, Russell S. Deacon, Jonas Wiedenmann,Philipp Leubner, Teunis M. Klapwijk, Christoph Brüne, Koji Ishibashi, Hartmut Buhmann, and Laurens W. Molenkamp
  • Journal Title: Nature Nanotechnology Volume: 12 Pages: 137-143
  • DOI: doi:10.1038/nnano.2016.159
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Supercurrent in the quantum hall regime (2016)
  • Author(s): F. Amet, C. T. Ke, I. V. Borzenets, J. Wang, K. Watanabe, T. Taniguchi, R. S. Deacon, M. Yamamoto, Y. Bomze, S. Tarucha, and G. Finkelstein
  • Journal Title: Science Volume: 352 Pages: 966-969
  • DOI: DOI: 10.1126/science.aad6203
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] Double quantum dots embedded in a superconducting coplanar waveguide resonator (2017)
  • Author(s): K. Ishibashi, R. Wang and R. S. Deacon
  • Organizer: Sweden-Japan International Workshop on Quantum Nanophysics and Nanoelectronics(QNANO2017)
  • Place of Presentation: Yokohama, Japan
  • Year and Date: 2017-03-23
  • Invited
• [Presentation] Signatures of 4π periodicity in the dynamics of HgTe Josephson Junctions (2017)
  • Author(s): R.S.Deacon
  • Organizer: 64th JSAP Spring Meeting
  • Place of Presentation: Yokohama, Japan
  • Year and Date: 2017-03-15
  • Invited
• [Presentation] Signatures of 4π periodicity in the dynamics of HgTe Josephson Junctions (2017)
  • Author(s): R.S.Deacon
  • Organizer: JSAP Workshop on Quantum Information and Related Fields
  • Place of Presentation: National Institute of Infomatics, Tokyo, Japan
  • Year and Date: 2017-03-02
  • Invited
• [Presentation] Signatures of 4π periodicity in the dynamics of HgTe Josephson Junctions (2016)
  • Author(s): R.S.Deacon
  • Organizer: International symposium on revolutionary atomic-layer materials
  • Place of Presentation: Tohoku University, Sendai, Japan
  • Year and Date: 2016-10-21
  • Invited
• [Presentation] Signatures of 4π periodicity in the dynamics of HgTe Josephson Junctions (2016)
  • Author(s): R.S.Deacon
  • Organizer: International workshop on nano-spin conversion science and quantum spin dynamics
  • Place of Presentation: Tokyo, Japan
  • Year and Date: 2016-10-13
  • Invited
• [Presentation] InSb double quantum dots embedded in a superconducting circuit cavity - Towards strong spin-photon coupling - (2016)
  • Author(s): K. Ishibashi, R. Wang and R. S. Deacon
  • Organizer: The 18th International Symposium on the Physics of Semiconductors and Applications (ISPSA 2016)
  • Place of Presentation: Jeju, Korea
  • Year and Date: 2016-07-04
  • Invited