Long Range Transfer of interacting fermions in Quantum Dot Arrays

Prof Gloria Platero (Universidad Autonoma, Madrid, SPAIN)
Event Date and Time: 
Tue, 2016-09-06 10:00 - 11:00
RM 309B - Hennings (6224 Agricultural Road)
Local Contact: 
Philip Stamp
Intended Audience: 

SPECIAL SEMINAR   (Condensed Matter)

Recent experiments in triple quantum dot devices show clear evidence of charge and spin electron exchange between the outermost dots [1-3]. Long-range transport in ac driven triple dots has also been investigated[4]; and the use of wave-function 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. Long-range 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 end-points; a repulsively bound-pair of fermions, known as a doublon, can be transferred from one end of the chain to the other via topological edge states. Non-topological 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. Gallego-Marcos,  R. Sánchez and G. Platero, PRB, 93, 075424 (2016)

[5] A. Gómez-León 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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