Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd.
Recently, noncentrosymmetric superconductor BiPd has attracted considerable research interest due to the possibility of hosting topological superconductivity. Here we report a systematic high-resolution angle-resolved photoemission spectroscopy (ARPES) and spin-resolved ARPES study of the normal state electronic and spin properties of BiPd. Our experimental results show the presence of a surface state at higher-binding energy with the location of Dirac point at around 700 meV below the Fermi level. The detailed photon energy, temperature-dependent and spin-resolved ARPES measurements complemented by our first-principles calculations demonstrate the existence of the spin-polarized surface states at high-binding energy. The absence of such spin-polarized surface states near the Fermi level negates the possibility of a topological superconducting behaviour on the surface. Our direct experimental observation of spin-polarized surface states in BiPd provides critical information that will guide the future search for topological superconductivity in noncentrosymmetric materials.
Department of Physics, University of Central Florida, Orlando, Florida 32816, USA.
Madhab
M
Neupane
Joseph Henry Laboratory and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Nasser
N
Alidoust
Department of Physics, University of Central Florida, Orlando, Florida 32816, USA.
M Mofazzel
MM
Hosen
Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Jian-Xin
JX
Zhu
Department of Physics, University of Central Florida, Orlando, Florida 32816, USA.
Klauss
K
Dimitri
Joseph Henry Laboratory and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Su-Yang
SY
Xu
Department of Physics, University of Central Florida, Orlando, Florida 32816, USA.
Nagendra
N
Dhakal
Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan.
Raman
R
Sankar
Joseph Henry Laboratory and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Ilya
I
Belopolski
Joseph Henry Laboratory and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Daniel S
DS
Sanchez
Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan.
Tay-Rong
TR
Chang
Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan.|Institute of Physics, Academia Sinica, Taipei 11529, Taiwan.
Horng-Tay
HT
Jeng
Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan.
Koji
K
Miyamoto
Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan.
Taichi
T
Okuda
Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore 117546, Singapore.|Department of Physics, National University of Singapore, Singapore 117542, Singapore.
Hsin
H
Lin
Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA.
Arun
A
Bansil
Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-950 Wroclaw, Poland.
Dariusz
D
Kaczorowski
Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan.
Fangcheng
F
Chou
Joseph Henry Laboratory and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
M Zahid
MZ
Hasan
Condensed Matter and Magnet Science Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.|Institute of Physics, Maria Curie - Sklodowska University, 20-031 Lublin, Poland.
Tomasz
0000-0002-1980-1874
T
Durakiewicz