title: Superconductivity Bordering Rashba Type Topological Transition.
abstract: Strong spin orbital interaction (SOI) can induce unique quantum phenomena such as topological insulators, the Rashba effect, or p-wave superconductivity. Combining these three quantum phenomena into a single compound has important scientific implications. Here we report experimental observations of consecutive quantum phase transitions from a Rashba type topological trivial phase to topological insulator state then further proceeding to superconductivity in a SOI compound BiTeI tuned via pressures. The electrical resistivity measurement with V shape change signals the transition from a Rashba type topological trivial to a topological insulator phase at 2 GPa, which is caused by an energy gap close then reopen with band inverse. Superconducting transition appears at 8 GPa with a critical temperature TCof 5.3 K. Structure refinements indicate that the consecutive phase transitions are correlated to the changes in the Bi-Te bond and bond angle as function of pressures. The Hall Effect measurements reveal an intimate relationship between superconductivity and the unusual change in carrier density that points to possible unconventional superconductivity.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: M L
authors.initials: ML
authors.lastname: Jin
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.|Center for High Pressure Science &Technology Advanced Research (HPSTAR), Shanghai, China.
authors.forename: F
authors.initials: F
authors.lastname: Sun
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: L Y
authors.initials: LY
authors.lastname: Xing
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: S J
authors.initials: SJ
authors.lastname: Zhang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: S M
authors.initials: SM
authors.lastname: Feng
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: P P
authors.initials: PP
authors.lastname: Kong
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: W M
authors.initials: WM
authors.lastname: Li
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: X C
authors.initials: XC
authors.lastname: Wang
authors.affiliation: HiPSEC, Department of Physics and Astronomy, University of Nevada at Las Vegas, Las Vegas, NV 89154-4002, USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Zhu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Y W
authors.initials: YW
authors.lastname: Long
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: H Y
authors.initials: HY
authors.lastname: Bai
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: C Z
authors.initials: CZ
authors.lastname: Gu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: R C
authors.initials: RC
authors.lastname: Yu
authors.affiliation: High Pressure Synergetic Consortium (HPSynC) &High Pressure Collaborative Access Team (HPCAT), Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA.|Center for High Pressure Science &Technology Advanced Research (HPSTAR), Shanghai, China.
authors.forename: W G
authors.initials: WG
authors.lastname: Yang
authors.affiliation: High Pressure Synergetic Consortium (HPSynC) &High Pressure Collaborative Access Team (HPCAT), Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA.
authors.forename: G Y
authors.initials: GY
authors.lastname: Shen
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.|HiPSEC, Department of Physics and Astronomy, University of Nevada at Las Vegas, Las Vegas, NV 89154-4002, USA.
authors.forename: Y S
authors.initials: YS
authors.lastname: Zhao
authors.affiliation: High Pressure Synergetic Consortium (HPSynC) &High Pressure Collaborative Access Team (HPCAT), Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA.|Center for High Pressure Science &Technology Advanced Research (HPSTAR), Shanghai, China.
authors.forename: H K
authors.initials: HK
authors.lastname: Mao
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.|Collaborative Innovation Center of Quantum Matters, Beijing, China.|School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: C Q
authors.initials: CQ
authors.lastname: Jin