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SUMMARY:Spin-polarised electrons and quantised transport in a ZnO heterost
 ructure - Hangtian Hou Cavendish Laboratory 
DTSTART:20161207T140000Z
DTEND:20161207T150000Z
UID:TALK69544@talks.cam.ac.uk
CONTACT:Mr Hangtian Hou
DESCRIPTION:With help of built-in spontaneous and piezoelectric polarizati
 on\, a high mobility two-dimensional electron gas was achieved at a ZnO/Mg
 ZnO heterointerface [1]\, where both QHE and FQHE were observed due to str
 ong electron-electron correlation [2][3]. \n\nRecently we succeed to fabri
 cate the first split-gate defined quasi-1D channel in this ZnO system and 
 measure in a dilution fridge. In presence of low magnetic fields\, we inve
 stigated the reflected edge state and observed the dominating odd-filling 
 factor states. However in absence of magnetic fields\, the system disorder
  result in irregular 1D conductance plateaux. By applying asymmetry bias w
 e distinguished the 1D conductance plateaux with ΔG= e2/h (ΔG= 2e2/h in 
 GaAs systems)\, indicating electrons in ZnO are spin-polarised even at zer
 o magnetic fields. In virtue of edge states\, we avoid the impurity state 
 and perform DC bias spectroscopy measurement to estimate the 1D subband en
 ergy in this oxide system. In future we wish to implement the single elect
 ron spin transport with surface acoustic waves on this ZnO heterostructure
 .\n
LOCATION:Venue to be confirmed
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