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.