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• 作者：Yinming ShaoKirk W. Post ; Jhih-Sheng Wu ; Siyuan Dai ; Alex J. Frenzel ; Anthony R. Richardella ; Joon Sue Lee ; Nitin Samarth ; Michael M. Fogler ; Alexander V. Balatsky ; Dmitri E. Kharzeev ; D. N. Basov
• 刊名：Nano Letters
• 出版年：2017
• 出版时间：February 8, 2017
• 年：2017
• 卷：17
• 期：2
• 页码：980-984
• 全文大小：406K
• ISSN：1530-6992

文摘

Using magneto-infrared spectroscopy, we have explored the charge dynamics of (Bi,Sb)₂Te₃ thin films on InP substrates. From the magneto-transmission data we extracted three distinct cyclotron resonance (CR) energies that are all apparent in the broad band Faraday rotation (FR) spectra. This comprehensive FR-CR data set has allowed us to isolate the response of the bulk states from the intrinsic surface states associated with both the top and bottom surfaces of the film. The FR data uncovered that electron- and hole-type Dirac Fermions reside on opposite surfaces of our films, which paves the way for observing many exotic quantum phenomena in topological insulators.