TY  - JOUR
AU  - Weyrich, C.
AU  - Drögeler, M.
AU  - Kampmeier, J.
AU  - Eschbach, M.
AU  - Mussler, G.
AU  - Merzenich, T.
AU  - Stoica, T.
AU  - Batov, I. E.
AU  - Schubert, J.
AU  - Plucinski, L.
AU  - Beschoten, B.
AU  - Schneider, C. M.
AU  - Stampfer, C.
AU  - Grützmacher, D.
AU  - Schäpers, Thomas
TI  - Growth, characterization, and transport properties of ternary (Bi $_{1− x}$ Sb $_{x}$ )$_{2}$ Te $_{3}$ topological insulator layers
JO  - Journal of physics / Condensed matter
VL  - 28
IS  - 49
SN  - 1361-648X
CY  - Bristol
PB  - IOP Publ.
M1  - FZJ-2016-05745
SP  - 495501 -
PY  - 2016
AB  - Ternary (Bi1−xSbx)2Te3 films with an Sb content between 0 and 100% were deposited ona Si(1 1 1) substrate by means of molecular beam epitaxy. X-ray diffraction measurementsconfirm single crystal growth in all cases. The Sb content is determined by x-ray photoelectronspectroscopy. Consistent values of the Sb content are obtained from Raman spectroscopy.Scanning Raman spectroscopy reveals that the (Bi1−xSbx)2Te3 layers with an intermediateSb content show spatial composition inhomogeneities. The observed spectra broadening inangular-resolved photoemission spectroscopy (ARPES) is also attributed to this phenomena.Upon increasing the Sb content from x = 0 to 1 the ARPES measurements show a shift ofthe Fermi level from the conduction band to the valence band. This shift is also confirmed bycorresponding magnetotransport measurements where the conductance changes from n- top-type. In this transition region, an increase of the resistivity is found, indicating a locationof the Fermi level within the band gap region. More detailed measurements in the transitionregion reveals that the transport takes place in two independent channels. By means of a gateelectrode the transport can be changed from n- to p-type, thus allowing a tuning of the Fermilevel within the topologically protected surface states.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000386495900001
C6  - pmid:27749271
DO  - DOI:10.1088/0953-8984/28/49/495501
UR  - https://juser.fz-juelich.de/record/820435
ER  -