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Using in situ angle-resolved photoemission spectroscopy, we systematically studied molecular-beam-epitaxy-grown topological crystalline insulator SnTe(111) thin films with varied thicknesses and substrate conditions. An oscillation in the band gap size with an increase in thickness was observed to depend on the electric field perpendicular to the films. The observations are consistent with the theoretically...
We have studied the magnetic and electrical transport properties of epitaxial NiAs-type CrTe thin films grown on SrTiO3(111) substrates. Unlike rectangle hysteresis loops obtained from magnetic measurements, we have identified intriguing extra bump/dip features from anomalous Hall experiments on the films with thicknesses less than 12 nm. This observed Hall anomaly is phenomenologically consistent...
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