TY - JOUR
T1 - Magnetic gap of fe-doped BiSbTe2Se bulk single crystals detected by tunneling spectroscopy and gate-controlled transports
AU - Yano, Rikizo
AU - Kudriashov, Andrei
AU - Hirose, Hishiro T.
AU - Tsuda, Taiki
AU - Kashiwaya, Hiromi
AU - Sasagawa, Takao
AU - Golubov, Alexander A.
AU - Stolyarov, Vasily S.
AU - Kashiwaya, Satoshi
N1 - Funding Information:
The authors thank Prof. Yukio Tanaka and Dr. Kohei Tsumura for fruitful discussions. This study was supported by JST CREST (Grant No. JPMJCR16F2) and KAKENHI (Grant Nos. JP15H05851, 15H05853, 16H03847, 18H01243, 20H00131, 21H04652, and 21K13854), Researcher Exchange Program between JSPS and RFBR (JPJSBP120194816), and JSPS Core-to-Core program "Oxide Superspin" (OSS) international network (Grant JPJSCCA20170002). Crystal growth was supported by Collaborative Research Projects in MSL-Tokyo Tech., Japan. A.A.G. and V.S.S. acknowledge the Grant RSF-ANR 20-42-09033.
Funding Information:
The authors thank Prof. Yukio Tanaka and Dr. Kohei Tsumura for fruitful discussions. This study was supported by JST CREST (Grant No. JPMJCR16F2) and KAKENHI (Grant Nos. JP15H05851, 15H05853, 16H03847, 18H01243, 20H00131, 21H04652, and 21K13854), Researcher Exchange Program between JSPS and RFBR (JPJSBP120194816), and JSPS Core-to-Core program “Oxide Superspin” (OSS) international network (Grant JPJSCCA20170002). Crystal growth was supported by Collaborative Research Projects in MSL-Tokyo Tech., Japan. A.A.G. and V.S.S. acknowledge the Grant RSF-ANR 20-42-09033.
Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/5/6
Y1 - 2021/5/6
N2 - Topological insulators with broken time-reversal symmetry and the Fermi level within the magnetic gap at the Dirac cone provides exotic topological magneto-electronic phenomena. Here, we introduce an improved magnetically doped topological insulator, Fe-doped BiSbTe2Se (Fe-BSTS) bulk single crystal, with an ideal Fermi level. Scanning tunneling microscopy and spectroscopy (STM/STS) measurements revealed that the surface state possesses a Dirac cone with the Dirac point just below the Fermi level by 12 meV. The normalized dI/dV spectra suggest a gap opening with Δmag ~55 meV, resulting in the Fermi level within the opened gap. Ionic-liquid gated-transport measurements also support the Dirac point just below the Fermi level and the presence of the magnetic gap. The chemical potential of the surface state can be fully tuned by ionic-liquid gating, and thus the Fe-doped BSTS provides an ideal platform to investigate exotic quantum topological phenomena.
AB - Topological insulators with broken time-reversal symmetry and the Fermi level within the magnetic gap at the Dirac cone provides exotic topological magneto-electronic phenomena. Here, we introduce an improved magnetically doped topological insulator, Fe-doped BiSbTe2Se (Fe-BSTS) bulk single crystal, with an ideal Fermi level. Scanning tunneling microscopy and spectroscopy (STM/STS) measurements revealed that the surface state possesses a Dirac cone with the Dirac point just below the Fermi level by 12 meV. The normalized dI/dV spectra suggest a gap opening with Δmag ~55 meV, resulting in the Fermi level within the opened gap. Ionic-liquid gated-transport measurements also support the Dirac point just below the Fermi level and the presence of the magnetic gap. The chemical potential of the surface state can be fully tuned by ionic-liquid gating, and thus the Fe-doped BSTS provides an ideal platform to investigate exotic quantum topological phenomena.
KW - 2022 OA procedure
UR - http://www.scopus.com/inward/record.url?scp=85105904797&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.1c00869
DO - 10.1021/acs.jpclett.1c00869
M3 - Article
C2 - 33900082
AN - SCOPUS:85105904797
SN - 1948-7185
VL - 12
SP - 4180
EP - 4186
JO - The journal of physical chemistry letters
JF - The journal of physical chemistry letters
IS - 17
ER -