scholarly journals Topological surface transport in epitaxial SnTe thin films grown on Bi2Te3

2014 ◽  
Vol 89 (12) ◽  
Author(s):  
A. A. Taskin ◽  
Fan Yang ◽  
Satoshi Sasaki ◽  
Kouji Segawa ◽  
Yoichi Ando
Keyword(s):  
Thin Films ◽  
Surface Transport ◽  
Topological Surface

scholarly journals 2D weak anti-localization in thin films of the topological semimetal Pd$$_{3}$$Bi$$_{2}$$S$$_{2}$$

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shama ◽  
R. K. Gopal ◽  
Goutam Sheet ◽  
Yogesh Singh
Keyword(s):  
Thin Films ◽  
Phonon Scattering ◽  
Surface States ◽  
Relaxation Mechanism ◽  
Transport Studies ◽  
Bulk Carriers ◽  
Topological Semimetal ◽  
Topological Surface ◽  
First Time ◽  
Electron Phonon Scattering

AbstractPd$$_{3}$$ 3 Bi$$_{2}$$ 2 S$$_{2}$$ 2 (PBS) is a recently proposed topological semimetal candidate. However, evidence for topological surface states have not yet been revealed in transport measurements due to the large mobility of bulk carriers. We report the growth and magneto-transport studies of PBS thin films where the mobility of the bulk carriers is reduced by two orders of magnitude, revealing for the first time, contributions from the 2-dimensional (2D) topological surface states in the observation of the 2D weak anti-localization (WAL) effect in magnetic field and angle dependent conductivity measurements. The magnetotransport data is analysed within the 2D Hikami-Larkin-Nagaoka (HLN) theory. The analysis suggests that multiple conduction channels contribute to the transport. It is also found that the temperature dependence of the dephasing length can’t be explained only by electron-electron scattering and that electron-phonon scattering also contributes to the phase relaxation mechanism in PBS films.

scholarly journals Strain driven emergence of topological non-triviality in YPdBi thin films

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Vishal Bhardwaj ◽  
Anupam Bhattacharya ◽  
Shivangi Srivastava ◽  
Vladimir V. Khovaylo ◽  
Jhuma Sannigrahi ◽  
...  
Keyword(s):  
Thin Films ◽  
Heavy Fermion ◽  
Critical Role ◽  
Surface States ◽  
Strain Engineering ◽  
Emergent Properties ◽  
Spintronic Devices ◽  
Topological States ◽  
Topological Surface ◽  
Strained Films

AbstractHalf-Heusler compounds exhibit a remarkable variety of emergent properties such as heavy-fermion behaviour, unconventional superconductivity and magnetism. Several of these compounds have been predicted to host topologically non-trivial electronic structures. Remarkably, recent theoretical studies have indicated the possibility to induce non-trivial topological surface states in an otherwise trivial half-Heusler system by strain engineering. Here, using magneto-transport measurements and first principles DFT-based simulations, we demonstrate topological surface states on strained [110] oriented thin films of YPdBi grown on (100) MgO. These topological surface states arise in an otherwise trivial semi-metal purely driven by strain. Furthermore, we observe the onset of superconductivity in these strained films highlighting the possibility of engineering a topological superconducting state. Our results demonstrate the critical role played by strain in engineering novel topological states in thin film systems for developing next-generation spintronic devices.

Disorder-induced decoupled surface transport channels in thin films of doped topological insulators

2018 ◽  
Vol 98 (4) ◽  
Author(s):  
Hanbum Park ◽  
Jimin Chae ◽  
Kwangsik Jeong ◽  
Hyejin Choi ◽  
Jaehun Jeong ◽  
...  
Keyword(s):  
Thin Films ◽  
Topological Insulators ◽  
Surface Transport ◽  
Transport Channels

scholarly journals Robust topological surface state in Kondo insulator SmB6 thin films

2014 ◽  
Vol 105 (22) ◽  
pp. 222403 ◽  
Author(s):  
Jie Yong ◽  
Yeping Jiang ◽  
Demet Usanmaz ◽  
Stefano Curtarolo ◽  
Xiaohang Zhang ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface State ◽  
Kondo Insulator ◽  
Topological Surface ◽  
Topological Surface State

Temperature evolution of topological surface states in Bi2Se3 thin films studied using terahertz spectroscopy

2017 ◽  
Author(s):  
Varun S. Kamboj ◽  
Angadjit Singh ◽  
Harvey E. Beere ◽  
Thorsten Hesjedal ◽  
Crispin H. W. Barnes ◽  
...  
Keyword(s):  
Thin Films ◽  
Terahertz Spectroscopy ◽  
Surface States ◽  
Temperature Evolution ◽  
Topological Surface

scholarly journals Robust topological surface states of Bi2Se3 thin films on amorphous SiO2/Si substrate and a large ambipolar gating effect

2014 ◽  
Vol 104 (24) ◽  
pp. 241606 ◽  
Author(s):  
Namrata Bansal ◽  
Nikesh Koirala ◽  
Matthew Brahlek ◽  
Myung-Geun Han ◽  
Yimei Zhu ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface States ◽  
Si Substrate ◽  
Amorphous Sio2 ◽  
Topological Surface ◽  
Gating Effect

Pseudo-Superlattices of Bi2Te3 Topological Insulator Films with Enhanced Thermoelectric Performance

2011 ◽  
Vol 1344 ◽  
Author(s):  
V. Goyal ◽  
D Teweldebrhan ◽  
A.A. Balandin
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Topological Insulator ◽  
Figure Of Merit ◽  
Room Temperature ◽  
Laser Flash ◽  
Thermoelectric Efficiency ◽  
Thermoelectric Figure ◽  
Surface Transport ◽  
Film Thinning

ABSTRACTIt was recently suggested theoretically that atomically thin films of Bi2Te3 topological insulators have strongly enhanced thermoelectric figure of merit. We used the “graphene-like” exfoliation process to obtain Bi2Te3 thin films. The films were stacked and subjected to thermal treatment to fabricate pseudo-superlattices of single crystal Bi2Te3 films. Thermal conductivity of these structures was measured by the “hot disk” and “laser flash” techniques. The room temperature in-plane and cross-plane thermal conductivity of the stacks decreased by a factor of ∼2.4 and 3.5 respectively as compared to that of bulk. The strong decrease of thermal conductivity with preserved electrical properties translates to ∼140-250% increase in the thermoelectric figure if merit. It is expected that the film thinning to few-quintuples, and tuning of the Fermi level can lead to the topological insulator surface transport regime with the theoretically predicted extraordinary thermoelectric efficiency.

scholarly journals Topological surface states in strained Dirac semimetal thin films

2020 ◽  
Vol 102 (15) ◽  
Author(s):  
Pablo Villar Arribi ◽  
Jian-Xin Zhu ◽  
Timo Schumann ◽  
Susanne Stemmer ◽  
Anton A. Burkov ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface States ◽  
Dirac Semimetal ◽  
Topological Surface
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