scholarly journals Effective Hamiltonian for surface states of topological insulator thin films with hexagonal warping

AIP Advances ◽  
2016 ◽  
Vol 6 (5) ◽  
pp. 055706 ◽  
Author(s):  
Zhuo Bin Siu ◽  
Seng Ghee Tan ◽  
Mansoor B. A. Jalil
Keyword(s):  
Thin Films ◽  
Topological Insulator ◽  
Surface States ◽  
Effective Hamiltonian

scholarly journals Spectroscopic signature of surface states and bunching of bulk subbands in topological insulator ( Bi0.4Sb0.6)2Te3 thin films

2022 ◽  
Vol 105 (3) ◽  
Author(s):  
Liesbeth Mulder ◽  
Carolien Castenmiller ◽  
Femke J. Witmans ◽  
Steef Smit ◽  
Mark S. Golden ◽  
...  
Keyword(s):  
Thin Films ◽  
Topological Insulator ◽  
Surface States

scholarly journals Effective Hamiltonian for surface states of topological insulator nanotubes

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Zhuo Bin Siu ◽  
Seng Ghee Tan ◽  
Mansoor B. A. Jalil
Keyword(s):  
Topological Insulator ◽  
Surface States ◽  
Effective Hamiltonian

scholarly journals Electron–Hole Asymmetry of Surface States in Topological Insulator Sb2Te3 Thin Films Revealed by Magneto-Infrared Spectroscopy

Nano Letters ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 4588-4593
Author(s):  
Yuxuan Jiang ◽  
Mahmoud M. Asmar ◽  
Xingyue Han ◽  
Mykhaylo Ozerov ◽  
Dmitry Smirnov ◽  
...  
Keyword(s):  
Thin Films ◽  
Infrared Spectroscopy ◽  
Topological Insulator ◽  
Surface States ◽  
Electron Hole

scholarly journals Europium Doping Impact on the Properties of MBE Grown Bi2Te3 Thin Film

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3111
Author(s):  
Katarzyna Balin ◽  
Marcin Wojtyniak ◽  
Mateusz Weis ◽  
Maciej Zubko ◽  
Bartosz Wilk ◽  
...  
Keyword(s):  
Thin Films ◽  
Topological Insulator ◽  
Secondary Ion Mass Spectrometry ◽  
Surface States ◽  
Spatial Inhomogeneity ◽  
Experimental Investigations ◽  
Crystallographic Structure ◽  
Transmission Microscopy ◽  
Europium Doping ◽  
The Impact

The impact of europium doping on the electronic and structural properties of the topological insulator Bi2Te3 is studied in this paper. The crystallographic structure studied by electron diffraction and transmission microscopy confirms that grown by Molecular Beam Epitaxy (MBE) system film with the Eu content of about 3% has a trigonal structure with relatively large monocrystalline grains. The X-ray photoemission spectroscopy indicates that europium in Bi2Te3 matrix remains divalent and substitutes bismuth in a Bi2Te3 matrix. An exceptional ratio of the photoemission 4d multiplet components in Eu doped film was observed. However, some spatial inhomogeneity at the nanometer scale is revealed. Firstly, local conductivity measurements indicate that the surface conductivity is inhomogeneous and is correlated with a topographic image revealing possible coexistence of conducting surface states with insulating regions. Secondly, Time of Flight Secondary Ion Mass Spectrometry (TOF-SIMS) depth-profiling also shows partial chemical segregation. Such in-depth inhomogeneity has an impact on the lattice dynamics (phonon lifetime) evaluated by femtosecond spectroscopy. This unprecedented set of experimental investigations provides important insights for optimizing the process of growth of high-quality Eu-doped thin films of a Bi2Te3 topological insulator. Understanding such complex behaviors at the nanoscale level is a necessary step before considering topological insulator thin films as a component of innovative devices.

scholarly journals Surface states of strained thin films of the Dirac semimetal Cd3As2

2019 ◽  
Vol 3 (6) ◽  
Author(s):  
Manik Goyal ◽  
Honggyu Kim ◽  
Timo Schumann ◽  
Luca Galletti ◽  
Anton A. Burkov ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface States ◽  
Dirac Semimetal
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