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SUMMARY:The realization of large arrays of quantum dots via a multiplexed 
 charge-locking system (SP Workshop) - Mr Moda Cao\, University of Cambridg
 e\, Semiconductor Physics Group
DTSTART:20151007T131500Z
DTEND:20151007T141500Z
UID:TALK60992@talks.cam.ac.uk
CONTACT:Teri Bartlett
DESCRIPTION:The structure of a multiplexed charge-locking system is introd
 uced\, together with its operation to deplete electrons on the measuring 2
 DEG. This device has the advantage of enabling independent control over a 
 considerable number of gates with limited electrical contacts. Preliminary
  tests for these devices have been carried out at 4.2 K and the results ar
 e presented. It was reaffirmed (with reference to previous measurements [1
 ]) that the current through the measuring 2DEG would drift in time even th
 ough the charge on the gate on top of it was locked. It was also found tha
 t the drift behavior was related to the history of how this current had be
 en pinched-off (through the use of the top gates). An intrinsic charge lea
 king was observed from a charge-locked gate when some of the other gates w
 as addressed. New designs have been brought forward aiming to tackle the a
 bove two problems. The prospective applications of this device is briefly 
 discussed.\n\n[1] R. K. Puddy et al\, arXiv: cond-mat/1408.2872v2 (2014)\n
LOCATION:Mott Seminar Room (Mott Building Room 531)\, Cavendish Laboratory
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