Photon anti-bunching in acoustically pumped quantum dots

Couto, O. D. D.; cacute, S. Lazi; Iikawa, F.; Stotz, J. A. H.; Jahn, U.; Hey, R.; Santos, P. V.

doi:10.1038/nphoton.2009.191

Cited by 95 publications

(91 citation statements)

References 19 publications

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“…In addition, the electric fields associated with a SAW travelling on a piezoelectric substrate can be used to trap and transport charge at the speed of sound over macroscopic distances. This leads to an acoustoelectric (AE) current, an effect that has been extensively studied in nanostructures over the last few years for applications such as metrology and quantum information processing [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Controlling the properties of surface acoustic waves using graphene

Bandhu

Nash

2015

Nano Res.

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Surface acoustic waves (SAWs) are elastic waves that propagate on the surface of a solid, much like waves on the ocean, with SAW devices used widely in communication and sensing. The ability to dynamically control the properties of SAWs would allow the creation of devices with improved performance or new functionality. However, so far it has proved extremely difficult to develop a practical way of achieving this control. In this paper we demonstrate voltage control of SAWs in a hybrid graphene-lithium niobate device. The velocity shift of the SAWs was measured as the conductivity of the graphene was modulated using an ion-gel gate, with a 0.1% velocity shift achieved for a bias of approximately 1 V. This velocity shift is comparable to that previously achieved in much more complicated hybrid semiconductor devices, and optimization of this approach could therefore lead to a practical, cost-effective voltage-controlled velocity shifter. In addition, the piezoelectric fields associated with the SAW can also be used to trap and transport the charge carriers within the graphene. Uniquely to graphene, we show that the acoustoelectric current in the same device can be reversed, and switched off, using the gate voltage.

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Section: Introductionmentioning

confidence: 99%

Controlling the properties of surface acoustic waves using graphene

Bandhu

Nash

2015

Nano Res.

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“…For axial NW based QDs key experiments including ultra-bright single photon emission [9], quasi-static charge state control [10] and optical initialization of spin states [11] clearly underpinned the large potential of these systems. Radio frequency surface acoustic waves (SAWs) represent a particularly attractive and powerful tool to probe and dynamically control charge excitations in semiconductor heterostructure including Quantum Hall systems [12,13,14], charge transport in oneand two-dimensional electron channels [15,16], transport of charges [17,18,19], spins [20] or dipolar excitons [21] and precisely timed carrier injection into QDs for low-jitter single photon emission [22,23,24,25]. Recently, these concepts have been transferred to intrinsic nanowires (NWs) [26] and nanotubes [27] and NWs containing complex radial and axial heterostructures [28,29,30].…”

Section: Introductionmentioning

confidence: 99%

Radio frequency occupancy state control of a single nanowire quantum dot

Weiß¹,

Schülein²,

Kinzel³

et al. 2014

J. Phys. D: Appl. Phys.

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Abstract.The excitonic occupancy state of a single, nanowire-based, heterostructure quantum dot is dynamically programmed by a surface acoustic wave. The quantum dot is formed by an interface or thickness fluctuation of a GaAs QW embedded in a AlGaAs shell of a GaAs − AlGaAs core-shell nanowire. As we tune the time at which carriers are photogenerated during the acoustic cycle, we find pronounced intensity oscillations of neutral and negatively charged excitons. At high acoustic power levels these oscillations become anticorrelated which enables direct acoustic programming of the dot's charge configuration, emission intensity and emission wavelength. Numerical simulations confirm that the observed modulations arise from acoustically controlled modulations of the electron and electron-hole-pair concentrations at the position of the quantum dot.

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“…[14][15][16][17][18] Acoustic charge transport has very recently been reported in graphene, 19,20 and we have investigated it in monolayer graphene, produced by chemical vapour deposition (CVD), transferred onto lithium niobate SAW devices, both at room temperature 21 and low temperature. 22 In this paper, we show that illumination of the same devices, using blue (450 nm) and red (735 nm) light-emitting diodes (LEDs), causes an increase in the acoustoelectric current which is much larger than the associated change in the conductivity of the graphene.…”

mentioning

confidence: 99%

Acoustoelectric photoresponse in graphene

Poole

Bandhu

Nash

2015

Applied Physics Letters

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The acoustoelectric current in graphene has been investigated as a function of illumination, using blue (450 nm) and red (735 nm) light-emitting diodes (LEDs), and surface acoustic wave (SAW) intensity and frequency. The measured acoustoelectric current increases with illumination, more than the measured change in the conductivity of the graphene, whilst retaining a linear dependence on the SAW intensity. The latter is consistent with the interaction between the carriers and SAWs being described by a relatively simple classical relaxation model suggesting that the change in the acoustoelectric current is caused by the effect of the illumination on the electronic properties of the graphene. The increase in the acoustoelectric current is greatest under illumination with the blue LED, consistent with the creation of a hot electron distribution.

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Photon anti-bunching in acoustically pumped quantum dots

Cited by 95 publications

References 19 publications

Controlling the properties of surface acoustic waves using graphene

Controlling the properties of surface acoustic waves using graphene

Radio frequency occupancy state control of a single nanowire quantum dot

Acoustoelectric photoresponse in graphene

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