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TT: Fachverband Tiefe Temperaturen
TT 6: Topological Semimetals
TT 6.4: Talk
Monday, March 27, 2023, 10:15–10:30, HSZ 304
Landau quantization in the topological semimetal WTe2 — •R. Sanchez-Barquilla1, F. Martin-Vega1, J. J. Baldovi2, M. Ochi3, R. Arita4, N. H. Jo5, S. L. Bud’ko5, P. C. Canfield5, H. Suderow1, and I. Guillamon1 — 1Laboratorio de Bajas Temperaturas y Altos Campos Magnéticos, UAM, E-28049, Spain — 2ICMol, UV, 46980 Paterna, Spain. — 3Department of Physics, Osaka University, Osaka 560-0043, Japan — 4RIKEN Center, Saitama 351-0198, Japan — 5Department of Physics and Astronomy, Ames, IA 50011
WTe2 is a layered semimetal which has sparked much interest due to the non-saturating linear MR and possible non-trivial band structure properties, such as Weyl type-II fermions. Quantum oscillations under magnetic fields signal the passage of Landau levels (LL) through the Fermi level and are easily observed in macroscopic measurements, providing a rather complete view of the FS. However, the Landau quantization of the band structure above and below the Fermi energy has not yet been resolved in detail. We present mK STM measurements up to 14T. We have obtained the band structure close to the Fermi level and identified the main electron and hole pockets thanks to QPI experiments at 0T. When applying magnetic field, the spatially averaged tunneling conductance is devoid of LL and shows no field dependence. Atomically resolved measurements present however Landau quantization. We show that the contribution from the electron and hole pockets to the tunneling density of states (DOS) compensates LL peaks in the spatially averaged DOS. We describe Landau quantization at atomic scale and show a non-trivial energy shift of the LL structure.