
10:00 am, Tuesday, September 6th, 2016
RM 309B  Hennings Building 6224 Agricultural Road, UBC
Long Range Transfer of interacting fermions in Quantum Dot Arrays
Prof. Gloria Platero
Universidad Autonoma, Madrid, SPAIN
Recent experiments in triple quantum dot devices show clear evidence of charge and spin electron exchange between the outermost dots [13]. Longrange transport in ac driven triple dots has also been investigated[4]; and the use of wavefunction topology has also recently become possible, in which edge states provide lossless transport that is protected against disorder.
I will review recent experiment and theory on long range transport in quantum dot arrays. Longrange transfer of two interacting electrons can be induced between the two ends of a dimer chain, by coupling states that are delocalized just between the chain's endpoints; a repulsively boundpair of fermions, known as a doublon, can be transferred from one end of the chain to the other via topological edge states. Nontopological surface states of the familiar Shockley type can be used to produce a similar form of transfer under the action of a periodic driving potential.
Combining these effects can produce transfer by means of more exotic topological effects, in which the driving field can be used to switch the topological character of the edge states[5], as measured by the Zak phase.
Thus one can induce long range transfer of strongly correlated particles by tuning both topology and driving[6].
[1] M. Busl et al., Nature Nanotech. 8, 261 (2013).
[2] F. Braakman et al., Nat. Nanotech., 8, 432 (2013).
[3] R. Sánchez et al., PRL, 112, 176803 (2014).
[4] F. GallegoMarcos, R. Sánchez and G. Platero, PRB, 93, 075424 (2016)
[5] A. GómezLeón and G. Platero, Phys Rev. Lett. 110, 200403 (2013)
[6] M. Bello, C.E. Creffield and G. Platero, Scientific Reports, 6, 22562 (2016).
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