Sn-doped Bi1.1Sb0.9Te2S bulk crystal topological insulator with excellent properties.
A long-standing issue in topological insulator research has been to find a bulk single crystal material that provides a high-quality platform for characterizing topological surface states without interference from bulk electronic states. This material would ideally be a bulk insulator, have a surface state Dirac point energy well isolated from the bulk valence and conduction bands, display quantum oscillations from the surface state electrons and be growable as large, high-quality bulk single crystals. Here we show that this material obstacle is overcome by bulk crystals of lightly Sn-doped Bi1.1Sb0.9Te2S grown by the vertical Bridgman method. We characterize Sn-BSTS via angle-resolved photoemission spectroscopy, scanning tunnelling microscopy, transport studies, X-ray diffraction and Raman scattering. We present this material as a high-quality topological insulator that can be reliably grown as bulk single crystals and thus studied by many researchers interested in topological surface states.
Frick Chemistry Laboratory, Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
S K
SK
Kushwaha
Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.|Brookhaven National Laboratory, Condensed Matter Physics and Materials Science Department, Upton, New York 11973, USA.
I
I
Pletikosić
Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
T
T
Liang
Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
A
A
Gyenis
X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
S H
SH
Lapidus
Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7.
Yao
Y
Tian
Department of Physics, Boston College, Boston, Massachusetts 02467-3804, USA.
He
H
Zhao
Department of Physics, Boston College, Boston, Massachusetts 02467-3804, USA.
K S
KS
Burch
Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Jingjing
J
Lin
Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Wudi
W
Wang
Frick Chemistry Laboratory, Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
Huiwen
H
Ji
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
A V
AV
Fedorov
Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Ali
A
Yazdani
Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
N P
NP
Ong
Brookhaven National Laboratory, Condensed Matter Physics and Materials Science Department, Upton, New York 11973, USA.
T
T
Valla
Frick Chemistry Laboratory, Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
R J
RJ
Cava