VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013

 QNplage

 Nanophysics: from fundamentals to applications

(the return)

 

Thursday 8
Topological Insulators

› 14:40 - 15:00 (20min)
Weak antilocalization in topological insulator Bi2Te3 microflakes
Shao-Pin Chiu  1@  , Juhn-Jong Lin  1, 2, *@  
1 : Institute of Physics, National Chiao Tung University  (IOP, NCTU)  -  Website
No.1001, Daxue Rd., East Dist., Hsinchu City 30010 -  Taiwan
2 : Department of Electrophysics, National Chiao Tung University  -  Website
No.1001, Daxue Rd., East Dist., Hsinchu City 30010 -  Taiwan
* : Corresponding author

We have studied the carrier transport in two topological insulator (TI) Bi2Te3 microflakes between 0.3 and 10 K and under applied backgate voltages (VBG). Logarithmic temperature dependent resistance corrections due to the two-dimensional electron-electron interaction effect in the presence of weak disorder were observed. The extracted Coulomb screening parameter is negative, which is in accord with the situation of strong spinorbit scattering as is inherited in the TI materials. In particular, positive magnetoresistances (MRs) in the two-dimensional weak-antilocalization (WAL) effect were measured in low magnetic fields, which can be satisfactorily described by a multichannel-conduction model. Both at low temperatures of T


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