Acoustically induced current flow in graphene

Mišeikis, Vaidotas; Cunningham, J. E.; Saeed, K.; O’Rorke, Richard; Davies, A. G.

doi:10.1063/1.3697403

Cited by 100 publications

(89 citation statements)

References 21 publications

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“…For example, SAW devices that are responsive to hydrogen and carbon monoxide [19], and moisture [20][21][22][23] have been reported. Acoustic charge transport has also very recently been reported in graphene [24,25], and we have investigated it in monolayer graphene, produced by chemical vapor deposition (CVD), and transferred onto lithium niobate SAW devices, both at room temperature [26], at low temperature [27], and under illumination [28].…”

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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“…[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.…”

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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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“…Owing to the form of the spectrum, there are many features defining the charge transport, 7,8 in particular, the high-current transport. [9][10][11] A series of related studies was performed recently to understand (i) the conductivity of graphene and its carrier dynamics, [12][13][14][15][16][17] (ii) plasmonic effects, [18][19][20][21] (iii) the own phonon generation by the carrier current, [22][23][24][25] (iv) the interaction between graphene electrons and SAWs, [26][27][28][29] and (v) sandwich-like "graphene-piezoelectric" structures, which allow one to create a new class of opto-acousto-electronic devices. [30][31][32][33][34] Nevertheless, the problem of modeling SAW amplification in graphene-based SAW amplifiers has not been studied systematically to date.…”

Section: Introductionmentioning

confidence: 99%

Multilayer-graphene-based amplifier of surface acoustic waves

2015

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The amplification of surface acoustic waves (SAWs) by a multilayer graphene (MLG)-based amplifier is studied. The conductivity of massless carriers (electrons or holes) in graphene in an external drift electric field is calculated using Boltzmann’s equation. At some carrier drift velocities, the real part of the variable conductivity becomes negative and MLG can be employed in SAW amplifiers. Amplification of Blustein’s and Rayleigh’s SAWs in CdS, a piezoelectric hexagonal crystal of the symmetry group C6v, is considered. The corresponding equations for SAW propagation in the device are derived and can be applied to other substrate crystals of the same symmetry. The results of the paper indicate that MLG can be considered as a perspective material for SAW amplification and related applications.

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Acoustically induced current flow in graphene

Cited by 100 publications

References 21 publications

Controlling the properties of surface acoustic waves using graphene

Controlling the properties of surface acoustic waves using graphene

Acoustoelectric photoresponse in graphene

Multilayer-graphene-based amplifier of surface acoustic waves

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