Details

Autor(en) / Beteiligte

• Yan, Yuan
• Heintze, Eric
• Pracht, Uwe S.
• Blankenhorn, Marian
• Dressel, Martin

Titel

Effects of oxygen plasma etching on Sb2Te3 explored by torque detected quantum oscillations

Ist Teil von

• Applied physics letters, 2016-04, Vol.108 (17)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2016

Quelle

American Institute of Physics (AIP) Journals

Beschreibungen/Notizen

• De Haas–van Alphen measurements evidence that oxygen plasma etching strongly affects the properties of the three-dimensional topological insulator Sb2Te3. The quantum oscillations in magnetization down to low temperature (T ≥ 2 K) and high magnetic field (B ≤ 7 T) have been systematically investigated using a high-sensitive cantilever torque magnetometer. The effective mass and the oscillation frequency obtained from de Haas–van Alphen measurements first increase and then decrease as the oxygen plasma etching time increases from 0 to 12 min, corresponding to an up- and down-shift of the Dirac point. We establish the cantilever torque magnetometer as a powerful contactless tool to investigate the oxygen sensitivity of the surface state in topological insulators.