Journal
PHYSICAL REVIEW B
Volume 87, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.121104
Keywords
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Funding
- German Research Foundation [SPP 1285, FOR 1162]
- joint DFG-JST Forschergruppe on Topological Electronics
- ERC-AG project 3-TOP
- Austrian Science Funds [I815-N16]
- Austrian Science Fund (FWF) [W1243] Funding Source: Austrian Science Fund (FWF)
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Using terahertz spectroscopy in external magnetic fields, we investigate the low-temperature charge dynamics of strained HgTe, a three-dimensional topological insulator. In resonator experiments, we observe quantum Hall oscillations at terahertz frequencies, which offer direct access to the unusual electrodynamic properties of the surface states of topological insulators. The 2D density estimated from the period of the quantum Hall oscillations agrees well with dc transport experiments on the topological surface state. The Dirac character of the surface state is further evidenced by the observation of the characteristic Berry phase in the dependence of the Landau levels on magnetic field. DOI: 10.1103/PhysRevB.87.121104
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