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NEST Scientific Report 2007-2009 SAW-driven electron dynamics in nanostructures

Summary: NEST Scientific Report 2007-2009
SAW-driven electron dynamics in nanostructures
he acoustoelectric effect is the manifestation of the transport of charge carriers in
a piezoelectric semiconductor by means of surface acoustic waves (SAWs). Lattice
deformations induced by SAWs in a piezoelectric substrate generate potential waves
that can drag electrons resulting in a net dc current or voltage [1] also in an intrinsic
medium if electrons are fed into the device by an appropriate injector [2].
In one-dimensional (1D) devices, this effect gives rise to acoustoelectric current quantization
[3]: control over the 1D-constriction width allows the accurate determination of the number
of electrons packed in each SAW-potential minimum down to single-electron transport.
The demonstration of quantized acoustoelectric effect led to the proposal of several
innovative devices: converting the flux of individual SAW-driven electrons in a flux of
photons by injecting them into a two-dimensional hole gas, would realise an almost ideal
single-photon source for quantum-cryptography applications. Additionally, manipulation of
single electrons in 1D systems can be exploited to implement scalable quantum-information-
processing circuits with solid-state devices. At NEST we are exploring these approaches
aiming at the realisation of a high-repetition-rate single-photon source [4] and a solid-state
Hadamard gate based on a three-terminal Aharonov-Bohm ring which is investigated in


Source: Abbondandolo, Alberto - Scuola Normale Superiore of Pisa


Collections: Mathematics