Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/48804
Title: SCANNING TUNNELING MICROSCOPY/SPECTROSCOPY STUDIES OF ULTRATHIN SB FILMS
Authors: XU WENTAO
Keywords: scanning tunneling microscopy/spectroscopy, topological insulator, Sb(111), Sb(110), surface state, thin film
Issue Date: 16-Aug-2013
Source: XU WENTAO (2013-08-16). SCANNING TUNNELING MICROSCOPY/SPECTROSCOPY STUDIES OF ULTRATHIN SB FILMS. ScholarBank@NUS Repository.
Abstract: Antimony is a semimetal with unique topological surface states. Taking advantage of quantum size effect, Sb thin film can open a bulk gap. This thesis presents the studies of ultrathin Sb films by scanning tunneling microscopy/spectroscopy together with first-principles calculations. Self-assembled Sb nanostructures tend to form high islands because Sb source evaporates in the form of Sb4. By adding a cracking part to crack Sb4 into single atoms, ultrathin Sb films can be grown. Surface states on 30 BL Sb(111) are spin-polarized topological surface states without inter-surface coupling. However, for 9 BL Sb(111), inter-surface coupling is significant near the edge of surface Brillouin zone. For 4 BL Sb(111), the space inversion asymmetry induced by the substrate must be taken into account for the interpretation of the surface states. Sb (110) thin films are relaxed. They follow even-ML growth mode below 6 ML. This growth mode is supported by calculations.
URI: http://scholarbank.nus.edu.sg/handle/10635/48804
Appears in Collections:Ph.D Theses (Open)

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