Hybrid Superconductor - Ge/Si core/shell nanowire devices

• Project/Area Number: 26790008
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Nanostructural physics
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: Deacon Russell 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
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 超伝導 / 超電導 / Nanowire / Majorana Fermion / Spin-orbit interaction / Josephson Junctions / Topological Insulator / Josephson Junction / Superconductor / Spin Orbit Interaction

Outline of Final Research Achievements

We study the spin orbit interaction in Ge/Si core/shell nanowires and identify short electrically tunable spin orbit lengths suitable for spin based electronic devices and the realization of Majorana Fermions. We develop techniques to produce transparent contacts to Ge/Si nanowires using high magnetic critical field　superconductors.　Toward　the　detection　of　Majorana　Fermions　we　develop　a　measurement　system to study the ac-Josephson effect in topological Josephson junction. Initial studies were performed on the well established　HgTe　based　topological　insulator　system　in　which　we　detect　evidence　for　a　4-pi　periodic　supercurrent expected for Majorana modes.

Research Products

• [Journal Article] Gapless Andreev bound states in the quantum spin Hall insulator HgTe (2017)
  • Author(s): Erwann Bocquillon, Russell S. Deacon, Jonas Wiedenmann, Philipp Leubner, Teun M. Klapwijk, Christoph Brune, Koji Ishibashi, H. Buhmann, and Laurens W. Molenkamp
  • Journal Title: Nature Nanotechnology Volume: 12 Issue: 2 Pages: 137-143
  • DOI: 10.1038/nnano.2016.159
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [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 Issue: 2 Pages: 021011-021011
  • DOI: 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
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] InSb nanowire double quantum dots coupled to a superconducting microwave cavity (2016)
  • Author(s): 235.Rui Wang, Russell S. Deacon, Diana Car, Erik P. A. M. Bakkers, and Koji Ishibashi
  • Journal Title: Appl. Phys. Lett. Volume: 108 Issue: 20
  • DOI: 10.1063/1.4950764
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Supercurrent in the quantum Hall regime (2016)
  • Author(s): F. Amet, C. T. Ke, I. V. Borzenets, Y-M. Wang, K. Watanabe, T. Taniguchi, R. S. Deacon, M. Yamamoto, Y. Bomze, S. Tarucha, G. Finkelstein
  • Journal Title: Science Volume: 382 Issue: 6288 Pages: 966-969
  • DOI: 10.1126/science.aad6203
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] 4pi-periodic Josephson supercurrent in HgTe-based topological Josephson junctions (2015)
  • Author(s): J. Wiedenmann, E. Bocquillon, R.S. Deacon, S. Hartinger, O. Herrmann, T.M. Klapwijk, L. Maier, C. Ames, C. Bru¨ne, C. Gould, A. Oiwa, K. Ishibashi, S. Tarucha, H. Buhmann & L.W. Molenkamp
  • Journal Title: Nature Commun. Volume: 7 Issue: 1 Pages: 10303-10303
  • DOI: 10.1038/ncomms10303
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Superconducting transport in single and parallel double InAs quantum dot Josephson junctions with Nb-based superconducting electrodes (2015)
  • Author(s): S. Baba, J. Sailer, R. S. Deacon, A. Oiwa, K. Shibata, K. Hirakawa, and S. Tarucha
  • Journal Title: Applied Physics Letters Volume: 107 Issue: 22 Pages: 222602-222602
  • DOI: 10.1063/1.4936888
  • Peer Reviewed / Int'l Joint Research
• [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
• [Presentation] InSb Nanowire Double Quantum Dots Coupled to a Superconducting Microwave Cavity (2016)
  • Author(s): Rui Wang, Russell S. Deacon, Diana Car, Erik P. A. M. Bakkers and Koji Ishibashi
  • Organizer: 63rd JSAP Spring Meeting
  • Place of Presentation: Oookayama Campus, Tokyo Inst. of Tech , Japan.
  • Year and Date: 2016-03-19
• [Presentation] Weak Anti-Localization Study of Spin-Orbit Interactions in the Ge/Si Core-Shell Nanowires (2016)
  • Author(s): Rui Wang, Russell S. Deacon, Jun Yao, Charles M. Lieber and Koji Ishibashi
  • Organizer: Science of Hybrid Quantum System (The second project meeting)
  • Place of Presentation: Osaka university, Japan.
  • Year and Date: 2016-03-02
• [Presentation] Interaction of InSb Quantum Dots with a Superconducting Microwave Cavity (2016)
  • Author(s): Rui Wang, Russell S. Deacon, Diana Car, Erik P. A. M. Bakkers and Koji Ishibashi
  • Organizer: Science of Hybrid Quantum System (The second project meeting)
  • Place of Presentation: Osaka university, Japan.
  • Year and Date: 2016-03-02
• [Presentation] Gapless Andreev Bound States in HgTe topological Josephson junctions (2016)
  • Author(s): R.S. Deacon, J. Wiedenmann, E. Bocquillon, S. Hartinger, O. Herrmann, T.M. Klapwijk, L. Maier, C. Ames, C. Brune, C. Gould, A. Oiwa, K. Ishibashi, S. Tarucha, H. Buhmann, and L.W. Molenkamp
  • Organizer: International Symposium on Dynamics in Artifical Quantum Systems
  • Place of Presentation: Tokyo University, Komaba, Japan.
  • Year and Date: 2016-01-12
• [Presentation] Spin Orbit Interaction in Single Ge/Si Core/Shell Nanowires with Electrically Swinging Dual Gates (2016)
  • Author(s): Rui Wang, Russell S. Deacon, Jun Yao, Charles M. Lieber and Koji Ishibashi
  • Organizer: International Symposium on Dynamics in Artificial Quantum Systems.
  • Place of Presentation: Tokyo University, Komaba, Japan.
  • Year and Date: 2016-01-12
• [Presentation] Anomalous Shapiro steps in strained HgTe Josephson junctions (2015)
  • Author(s): R.S. Deacon, J. Wiedenmann, E. Bocquillon, S. Hartinger, O. Herrmann, T.M. Klapwijk, L. Maier, C. Ames, C. Brune, C. Gould, A. Oiwa, K. Ishibashi, S. Tarucha, H. Buhmann, and L.W. Molenkamp
  • Organizer: 1st Annual symposium of Topological Materials Science
  • Place of Presentation: Kyoto University, Japan.
  • Year and Date: 2015-12-11
• [Presentation] Zero-energy Andreev bound states in a HgTe topological Josephson junction (2015)
  • Author(s): R.S. Deacon, J. Wiedenmann, E. Bocquillon, S. Hartinger, O. Herrmann, T.M. Klapwijk, L. Maier, C. Ames, C. Brune, C. Gould, A. Oiwa, K. Ishibashi, S. Tarucha, H. Buhmann, and L.W. Molenkamp
  • Organizer: ISNTT2015, Atsugi, Japan. November 18th 2015.
  • Place of Presentation: NTT, Atsugi, Japan.
  • Year and Date: 2015-11-17