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Elucidation of the symmetry of superconducting gap of topological superconductor CuxBi2Se3 and other novel materials

Research Project

Project/Area Number 24740237
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Condensed matter physics II
Research InstitutionOsaka University

Principal Investigator

SASAKI Satoshi  大阪大学, 産業科学研究所, 助教 (00540105)

Project Period (FY) 2012-04-01 – 2014-03-31
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywordsトポロジカル絶縁体ヘテロ構造物質 / 超伝導トポロジカル結晶絶縁体 / 超伝導トポロジカル絶縁体 / トポロジカル超格子絶縁体 / ポイントコンタクト分光 / トポロジカル超伝導体 / トポロジカル結晶絶縁体
Research Abstract

Two new superconductors with time-reversal invariance similar to a superconducting topological insulator CuxBi2Se3 have been discovered: one of them is a superconducting In-doped topological crystalline insulator Sn1-xInxTe; the other is a superconductor Cux(PbSe)5(Bi2Se3)6 synthesized by intercalating Cu into a topological insulator heterostructure consisting of Bi2Se3 (topological insulator) and PbSe (ordinary insulator). The point-contact spectroscopy and specific heat measurements allowed us to elucidate the symmetry of the superconducting gaps in these materials. Based on the revealed properties we proposed Sn1-xInxTe and Cux(PbSe)5(Bi2Se3)6 as candidate materials that can build a platform for the study of topological superconductivity, contributing to the development of the relevant field.

Report

(3 results)
  • 2013 Annual Research Report   Final Research Report ( PDF )
  • 2012 Research-status Report
  • Research Products

    (40 results)

All 2014 2013 2012 Other

All Journal Article (9 results) (of which Peer Reviewed: 8 results,  Acknowledgement Compliant: 2 results) Presentation (30 results) (of which Invited: 12 results) Remarks (1 results)

  • [Journal Article] Topological surface transport in epitaxial SnTe thin films grown on Bi2Te32014

    • Author(s)
      A. A. Taskin, Fan Yang, Satoshi Sasaki, K. Segawa, Y. Ando
    • Journal Title

      Physical Review B

      Volume: 89 Issue: 12

    • DOI

      10.1103/physrevb.89.121302

    • Related Report
      2013 Final Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Unusual nature of fully gapped superconductivity in In-doped SnTe2013

    • Author(s)
      M. Novak, S. Sasaki, M. Kriener, K. Segawa, Y. Ando
    • Journal Title

      Physical Review B

      Volume: 88 Issue: 14

    • DOI

      10.1103/physrevb.88.140502

    • Related Report
      2013 Annual Research Report 2013 Final Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Anomalous Dressing of Dirac Fermions in the Topological Surface State of Bi_2Se_3, Bi_2Te_3, and Cu-Doped Bi_2Se_32013

    • Author(s)
      T. Kondo, Y. Nakashima, Y. Ota,Y. Ishida, W. Malaeb, K.Okazaki,S.Shin
    • Journal Title

      Physical Review Letters

      Volume: 110 Issue: 21 Pages: 217601-217601

    • DOI

      10.1103/physrevlett.110.217601

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Fermiology of Strongly Spin-Orbit Coupled Superconductor Sn1-xInxTe and its Implication to Topological Superconductivity2013

    • Author(s)
      T. Sato, Y. Tanaka, K. Nakayama, S. Souma, T. Takahashi, S. Sasaki, Z. Ren, A. A. Taskin, Kouji Segawa, Yoichi Ando
    • Journal Title

      Physical Review Letters

      Volume: 110 Issue: 20

    • DOI

      10.1103/physrevlett.110.206804

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] トポロジカル超伝導体実証への道 : ソフトポイントコンタクト分光法の開発2013

    • Author(s)
      佐々木聡、クリーナーマルクス、瀬川耕司、安藤陽一
    • Journal Title

      超伝導科学技術研究会FSST NEWS

      Volume: No.138 Pages: 17-20

    • URL

      http://www.sntt.or.jp/~fsst/fsstnews2013.html

    • Related Report
      2013 Final Research Report
  • [Journal Article] Odd-Parity Pairing and Topological Superconductivity in a Strongly Spin-Orbit Coupled Semiconductor2012

    • Author(s)
      S. Sasaki, Z. Ren, A. A. Taskin, K. Segawa, L. Fu, Y. Ando
    • Journal Title

      Physical Review Letters

      Volume: 109 Issue: 21

    • DOI

      10.1103/physrevlett.109.217004

    • Related Report
      2013 Final Research Report 2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Anomalous suppression of the superfluid density in the CuxBi2Se3 superconductor upon progressive Cu intercalation2012

    • Author(s)
      M. Kriener, K. Segawa, S. Sasaki, Y. Ando
    • Journal Title

      Physical Review B

      Volume: 86 Issue: 18

    • DOI

      10.1103/physrevb.86.180505

    • Related Report
      2013 Final Research Report 2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Achieving Surface Quantum Oscillations in Topological Insulator Thin Films of Bi_2Se_32012

    • Author(s)
      A. A. Taskin, Satoshi Sasaki, Kouji Segawa, Yoichi Ando
    • Journal Title

      Advanced Materials

      Volume: 24 Issue: 41 Pages: 5581-5585

    • DOI

      10.1002/adma.201201827

    • Related Report
      2013 Final Research Report 2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Manifestation of Topological Protection in Transport Properties of Epitaxial Bi2Se3 Thin Films2012

    • Author(s)
      A. A. Taskin, S. Sasaki, K. Segawa, Y. Ando
    • Journal Title

      Physical Review Letters

      Volume: 109 Issue: 6

    • DOI

      10.1103/physrevlett.109.066803

    • Related Report
      2013 Final Research Report 2012 Research-status Report
    • Peer Reviewed
  • [Presentation] Superconducting doped topological insulators2014

    • Author(s)
      Satoshi Sasaki
    • Organizer
      The 5th Science Research Center for Topological Matter Winter Workshop
    • Place of Presentation
      Yongpyong Resort (Republic of Korea)
    • Year and Date
      2014-02-06
    • Related Report
      2013 Final Research Report
    • Invited
  • [Presentation] Superconducting doped topological insulators2014

    • Author(s)
      Satoshi Sasaki
    • Organizer
      The 5th Science Research Center for topological Matter Winter Workshop
    • Place of Presentation
      Yongpyong Resort, Korea
    • Related Report
      2013 Annual Research Report
    • Invited
  • [Presentation] 超伝導トポロジカル絶縁体のバルクトポロジカル超伝導性、新学術領域研究・対称性の破れた凝縮系におけるトポロジカル量子現象2013

    • Author(s)
      佐々木聡, M. Novak, M. Kriener,瀬川耕司,安藤陽一
    • Organizer
      第4回領域研究会「トポロジカル超伝導・超流動」
    • Place of Presentation
      名古屋大学(愛知県名古屋市)
    • Year and Date
      2013-12-19
    • Related Report
      2013 Final Research Report
    • Invited
  • [Presentation] Conductance Spectroscopy on Superconducting Topological Insulator Families2013

    • Author(s)
      Satoshi Sasaki, A. A. Taskin, K. Segawa, Y. Ando
    • Organizer
      International Workshop for Young Researchers on Topological Quantum Phenomena in Condensed Matter with Broken Symmetries 2013
    • Place of Presentation
      カルチャーリゾートフェストーネ(沖縄県宜野湾市)
    • Year and Date
      2013-10-23
    • Related Report
      2013 Final Research Report
    • Invited
  • [Presentation] Phase diagram of Sn_<1->xIn_xTe - a Topological Superconductor candidate2013

    • Author(s)
      M. Novak, Satoshi Sasaki, M. Kriener, K. Segawa, Y. Ando
    • Organizer
      International Workshop for Young Researchers on Topological Quantum Phenomena in Condensed Matter with Broken Symmetries 2013
    • Place of Presentation
      カルチャーリゾートフェストーネ(沖縄県宜野湾市)
    • Year and Date
      2013-10-23
    • Related Report
      2013 Final Research Report
  • [Presentation] 超伝導Tl_5Te_3のポイントコンタクト分光2013

    • Author(s)
      佐々木聡、鳥羽俊伸、瀬川耕司、安藤陽一
    • Organizer
      日本物理学会2013年秋季大会
    • Place of Presentation
      徳島大学(徳島県徳島市)
    • Year and Date
      2013-09-27
    • Related Report
      2013 Final Research Report
  • [Presentation] Experimental efforts to realize time-reversal invariant topological superconductors2013

    • Author(s)
      Satoshi Sasaki, A. A. Taskin, K. Segawa, Y. Ando
    • Organizer
      International Symposium on Quantum Fluids and Solids(QFS2013)
    • Place of Presentation
      くにびきメッセ(島根県松江市)
    • Year and Date
      2013-08-05
    • Related Report
      2013 Final Research Report
    • Invited
  • [Presentation] レーザー励起型角度分解光電子分光で観察したカリウム蒸着により変化するトポロジカル絶縁体の表面電子状態2013

    • Author(s)
      中島祐貴,近藤猛,石田行章, Walid Malaeb,渡部俊太郎, Cuangtian Chen, Markus Kriener,佐々木聡,瀬川耕司,安藤陽一,辛埴
    • Organizer
      日本物理学会第68回年次大会
    • Place of Presentation
      広島大学東広島キャンパス(広島県東広島市)
    • Year and Date
      2013-03-28
    • Related Report
      2013 Final Research Report
  • [Presentation] ドープされたトポロジカル結晶絶縁体Sn1-xInxTeの超電導特性2013

    • Author(s)
      佐々木聡,任之, A. A. Taskin,瀬川耕司, L. Fu,安藤陽一
    • Organizer
      日本物理学会第68回年次大会
    • Place of Presentation
      広島大学東広島キャンパス(広島県東広島市)
    • Year and Date
      2013-03-28
    • Related Report
      2013 Final Research Report
  • [Presentation] Search for topological superconductivity in superconducting topological insulators2013

    • Author(s)
      Satoshi Sasaki
    • Organizer
      American Physical Society March Meeting
    • Place of Presentation
      Baltimore (Washington D.C., U.S.A)
    • Year and Date
      2013-03-18
    • Related Report
      2013 Final Research Report
    • Invited
  • [Presentation] Experimental efforts to realize time-reversal invariant topological superconductors2013

    • Author(s)
      Satoshi Sasaki
    • Organizer
      Quantum Fluid and Solid International Symposium 2013
    • Place of Presentation
      松江市 くにびきメッセ
    • Related Report
      2013 Annual Research Report
    • Invited
  • [Presentation] 超伝導Tl5Te3のポイントコンタクト分光2013

    • Author(s)
      佐々木 聡、鳥羽 俊伸、瀬川 耕司、安藤 陽一
    • Organizer
      日本物理学会 2013年秋季大会
    • Place of Presentation
      徳島市 徳島大学三島キャンパス
    • Related Report
      2013 Annual Research Report
  • [Presentation] トポロジカル超伝導体候補物質Sn1-xInxTeの電子構造:高分解能ARPES2013

    • Author(s)
      佐藤 宇史、田中 祐輔、中山 耕輔、相馬 清吾、高橋 隆、佐々木 聡、Z. Ren、A. A. Taskin、瀬川 耕司、安藤 陽一
    • Organizer
      日本物理学会 2013年秋季大会
    • Place of Presentation
      徳島市 徳島大学三島キャンパス
    • Related Report
      2013 Annual Research Report
  • [Presentation] Conductance Spectroscopy on Superconducting Topological Insulator Families2013

    • Author(s)
      Satoshi Sasaki
    • Organizer
      International Workshop for Young Researchers on Topological Quantum phenomena in Condensed Matter with Broken Symmetries
    • Place of Presentation
      沖縄県宜野湾市 カルチャーリゾート フェストーネ
    • Related Report
      2013 Annual Research Report
    • Invited
  • [Presentation] Ionic-liquid gating experiment on topological insulators2013

    • Author(s)
      K. Segawa, Zhi Ren, Satoshi Sasaki, T. Tsuda, S. Kuwabata, and Y. Ando
    • Organizer
      International Workshop for Young Researchers on Topological Quantum phenomena in Condensed Matter with Broken Symmetries
    • Place of Presentation
      沖縄県宜野湾市 カルチャーリゾート フェストーネ
    • Related Report
      2013 Annual Research Report
  • [Presentation] Phase diagram of Sn1-xInxTe - a Topological Superconductor candidate2013

    • Author(s)
      M. Novak, Satoshi Sasaki, M. Kriener, K. Segawa, Y. Ando
    • Organizer
      International Workshop for Young Researchers on Topological Quantum phenomena in Condensed Matter with Broken Symmetries
    • Place of Presentation
      沖縄県宜野湾市 カルチャーリゾート フェストーネ
    • Related Report
      2013 Annual Research Report
  • [Presentation] Topological superconductivity in bulk in superconducting topological insulators2013

    • Author(s)
      佐々木 聡
    • Organizer
      トポロジカル量子現象第4回領域研究会
    • Place of Presentation
      名古屋大学東山キャンパス
    • Related Report
      2013 Annual Research Report
    • Invited
  • [Presentation] Search for topological superconductivity in superconducting topological insulators2013

    • Author(s)
      佐々木聡
    • Organizer
      American Physical Society March Meeting
    • Place of Presentation
      Baltimore, U.S.A.
    • Related Report
      2012 Research-status Report
    • Invited
  • [Presentation] ドープされたトポロジカル結晶絶縁体 Sn1-xInxTeの超伝導特性2013

    • Author(s)
      佐々木聡
    • Organizer
      日本物理学会第68回年次大会
    • Place of Presentation
      広島大学東広島キャンパス
    • Related Report
      2012 Research-status Report
  • [Presentation] 超伝導トポロジカル絶縁体のトポロジカル超伝導性、新学術領域研究・対称性の破れた凝縮系におけるトポロジカル量子現象2012

    • Author(s)
      佐々木聡
    • Organizer
      第10回集中連携研究会「トポロジカル超伝導・超流動」
    • Place of Presentation
      大阪大学産業科学研究所(大阪府茨木市)
    • Year and Date
      2012-12-13
    • Related Report
      2013 Final Research Report
    • Invited
  • [Presentation] 超伝導トポロジカル絶縁体の物性研究2012

    • Author(s)
      佐々木聡
    • Organizer
      物性セミナー
    • Place of Presentation
      東京大学駒場キャンパス(東京都目黒区)
    • Year and Date
      2012-11-16
    • Related Report
      2013 Final Research Report
    • Invited
  • [Presentation] 新奇な超伝導体候補物質TlドープPbTeの単結晶作製2012

    • Author(s)
      上山卓巳,佐々木聡, A. A. Taskin,瀬川耕司,安藤陽一
    • Organizer
      日本物理学会2012年秋季大会
    • Place of Presentation
      横浜国立大学常盤台キャンパス(神奈川県横浜市
    • Year and Date
      2012-09-20
    • Related Report
      2013 Final Research Report
  • [Presentation] コバルト膜を蒸着したトポロジカル絶縁体バルク単結晶の輸送特性2012

    • Author(s)
      江藤数馬,佐々木聡, Zhi Ren,瀬川耕司,安藤陽一
    • Organizer
      日本物理学会2012年秋季大会
    • Place of Presentation
      横浜国立大学常盤台キャンパス(神奈川県横浜市
    • Year and Date
      2012-09-20
    • Related Report
      2013 Final Research Report
  • [Presentation] MBE Growth of Topological Insulators2012

    • Author(s)
      A. A. Taskin, Satoshi Sasaki, K. Segawa, Y. Ando
    • Organizer
      日本物理学会2012年秋季大会
    • Place of Presentation
      横浜国立大学常盤台キャンパス(神奈川県横浜市
    • Year and Date
      2012-09-19
    • Related Report
      2013 Final Research Report
  • [Presentation] Soft point-contact spectroscopy of Cu_xBi_2Se_32012

    • Author(s)
      Satoshi Sasaki, M. Kriener, K. Segawa, K. Yada, Y. Tanaka, M. Sato, Y. Ando
    • Organizer
      Gordon Research Conference the 2012 correlated electron systems
    • Place of Presentation
      South Hadley (Massachusetts, U.S.A.)
    • Year and Date
      2012-06-27
    • Related Report
      2013 Final Research Report
  • [Presentation] Soft point-contact spectroscopy of Cu_xBi_2Se_32012

    • Author(s)
      Satoshi Sasaki, M. Kriener, K. Segawa, Y. Ando
    • Organizer
      International Conference on Topological Quantum Phenomena (TQP2012)
    • Place of Presentation
      名古屋大学(愛知県名古屋市)
    • Year and Date
      2012-05-19
    • Related Report
      2013 Final Research Report
  • [Presentation] Small superfluid density in Cu_xBi_2Se_32012

    • Author(s)
      M. Kriener, S. Segawa, Satoshi Sasaki, Y. Ando
    • Organizer
      International Conference on Topological Quantum Phenomena (TQP2012)
    • Place of Presentation
      名古屋大学(愛知県名古屋市)
    • Year and Date
      2012-05-19
    • Related Report
      2013 Final Research Report
  • [Presentation] Molecular Beam Epitaxial Growth of Topological Insulators on Insulating Substrates2012

    • Author(s)
      A. Taskin, Satoshi Sasaki, K. Segawa, Y. Ando
    • Organizer
      International Conference on Topological Quantum Phenomena (TQP2012)
    • Place of Presentation
      名古屋大学(愛知県名古屋市)
    • Year and Date
      2012-05-17
    • Related Report
      2013 Final Research Report
  • [Presentation] Soft point-contact spectroscopy of CuxBi2Se32012

    • Author(s)
      佐々木聡
    • Organizer
      International Conference on Topological Quantum Phenomena (TQP2012)
    • Place of Presentation
      名古屋大学
    • Related Report
      2012 Research-status Report
  • [Presentation] Soft point-contact spectroscopy of CuxBi2Se32012

    • Author(s)
      佐々木聡
    • Organizer
      Gordon Research Conference the 2012 correlated electron systems
    • Place of Presentation
      South Hadley, U.S.A.
    • Related Report
      2012 Research-status Report
  • [Remarks]

    • URL

      http://www.sanken.osaka-u.ac.jp/~sasaki/

    • Related Report
      2013 Final Research Report

URL: 

Published: 2013-05-31   Modified: 2020-05-15  

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