Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session G55: Transport and Thermodynamic Properties of Topological Systems: I
11:15 AM–2:15 PM,
Tuesday, March 3, 2020
Room: Mile High Ballroom 2B
Sponsoring
Unit:
DCMP
Chair: Yuhang Deng, UC San Diego
Abstract: G55.00003 : Magnetotransport and weak anti-localization signatures in band-engineered 3D topological insulator pn-heterostructures
Presenter:
Thomas Mayer
(University of Regensburg)
Authors:
Thomas Mayer
(University of Regensburg)
Hedwig Werner
(University of Regensburg)
Florian Schmid
(University of Regensburg)
Johannes Ziegler
(University of Regensburg)
Elisabeth Richter
(University of Regensburg)
Ralf Fischer
(University of Regensburg)
Rebeca Diaz-Pardo
(TU Munich)
Jun Fujii
(Elettra-Sincrotrone Trieste)
Ivana Vobornik
(Elettra-Sincrotrone Trieste)
Dieter Karl Weiss
(University of Regensburg)
Christian Back
(TU Munich)
Matthias Kronseder
(University of Regensburg)
Dominique Bougeard
(University of Regensburg)
In this contribution, we combine band structure engineering in Bi-based heterostructures with alloy composition-tuning to provide experimental access to single TSS. In a vertical pn-heterostructure of 3D TIs, intrinsic band bending is introduced to create an internal depletion zone. It will not only induce compensation of unintentional charges, but also lead to an isolation of the top TSS from parasitic bulk background. We present pn-heterostructures with (Bi1-xSbx)2(Te1-ySey)3 as the p-type layer. Varying (x,y) provides extensive control over the position of the Dirac point and the Fermi level. Moreover we observe a significant reduction of bulk carriers, compared to e.g. Bi2Se3. We analyze our heterostructures in magnetotransport and angle-resolved photoemission spectroscopy (ARPES). Furthermore we discuss our conclusions in the light of the Hikami-Larkin-Nagaoka theory for weak anti-localization signatures observed in the longitudinal magneto-resistance.
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