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SUMMARY:(SP Wednesday Workshop) Applications of the quantum multiplexer - 
 Mr Arthur Lesage\, University of Cambridge
DTSTART:20140507T131500Z
DTEND:20140507T141500Z
UID:TALK52466@talks.cam.ac.uk
CONTACT:Teri Bartlett
DESCRIPTION:A new method for measuring several devices in a single cool do
 wn has been recently designed by the group. It is based on a multiplexing 
 scheme\, which allows different two-dimensional (2D) channels to be addres
 sed separately [1]. Using two multiplexers enables an array of devices to 
 be measured\, the lines and columns being selected by the multiplexers. Th
 is work explores some possibilities offered by this new technique.\n\nFirs
 t\, the multiplexer is used to study one-dimensional (1D) transport in a G
 aAs/AlGaAs heterostructure. Whereas the quantisation of the 1D conductance
  G is well described by the theory [2-3]\, an additional plateau occurring
  at G=0.7×(2e^2)/h\, called the 0.7 anomaly\, is not yet fully understood
 . This work aims at proposing a statistically significant set of data to b
 etter understand this phenomenon. In this case\, the array of devices addr
 essed by the two multiplexers is composed of split-gates.\n\nThe second pa
 rt of this work focuses on 2D transport (the split-gates are replaced by b
 ar-gates in the array). Using the capacitor model of the 2D channels [4]\,
  this work characterises the electron density homogeneity of the measured 
 wafer and the effect of cooling rate on this homogeneity.\n\n[1] H. Al-Tai
 e etal. Applied Physics Letters\, 102(243102): 1–4\, 2013.\n[2] R. Landa
 uer. IBM Journal of Research and Development\, 1(3): 306\, 1957.\n[3] M. B
 üttiker. Physical Review B\, 41(11): 7906–7909\, 1990.\n[4] C. J. B. Fo
 rd. Part III minor option (University of Cambridge)\, chapter 5.\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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