Quantum Oscillations in Topological Insulator β-Ag2Te with High Mobility*

Stimulated by the fascinating properties discovered in topological insulators, topological quantum materials have become an exciting frontier in condensed matter physics and materials science. In this study, we claim a developed growth scheme to synthesize single crystalline (β-Ag₂Te) nanoplates with tunable Fermi levels by chemical vapor deposition(CVD). We systemically studied the transport measurement , showing that the atomic ratio of Ag and Te can significantly change the Fermi level of Ag₂Te nanoplates which achieves highest reported mobility (~50000 cm^2/V*s), and significant quantum oscillations appear. By analyzing the frequency and amplitude of the quantum oscillation, we can obtain various parameters in Ag₂Te, and push back the energy band structure.
LEE S, IN J, YOO Y et al., Single Crystalline β-Ag2Te Nanowire as a New Topological Insulator[J]. Nano Letters, 2012, 12(8): 4194–4199.