Valley Acoustoelectric Effect

Kalameitsev, A. V.; Kovalev, V. M.; Savenko, I. G.

doi:10.1103/physrevlett.122.256801

Cited by 44 publications

(33 citation statements)

References 53 publications

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“…[231][232][233] Subsequently, the Rayleigh SAW, viewed as a moving electrical superlattice potential, was shown to modify the electronic dispersion of ballistic graphene close to the charge-neutrality point [234][235][236] with an acoustoelectric current that is dependent on the SAW propagation direction. [237][238][239] Similar acoustoelectric coupling has also been observed in graphene ranoribbons, [240,241] QDs, [242][243][244][245] suspended quantum point contacts, [246] GaAs [247] and GaAs/AlGaAs hetrostructures, [248,249] and, more recently, 2D materials such as MoS 2 [250] and black phosphorous, [251] in which an anomalous acoustoelectric current was sustained.…”

Section: Electronic Manipulationmentioning

confidence: 75%

High Frequency Sonoprocessing: A New Field of Cavitation‐Free Acoustic Materials Synthesis, Processing, and Manipulation

et al. 2020

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Ultrasound constitutes a powerful means for materials processing. Similarly, a new field has emerged demonstrating the possibility for harnessing sound energy sources at considerably higher frequencies (10 MHz to 1 GHz) compared to conventional ultrasound (⩽3 MHz) for synthesizing and manipulating a variety of bulk, nanoscale, and biological materials. At these frequencies and the typical acoustic intensities employed, cavitation-which underpins most sonochemical or, more broadly, ultrasound-mediated processes-is largely absent, suggesting that altogether fundamentally different mechanisms are at play. Examples include the crystallization of novel morphologies or highly oriented structures; exfoliation of 2D quantum dots and nanosheets; polymer nanoparticle synthesis and encapsulation; and the possibility for manipulating the bandgap of 2D semiconducting materials or the lipid structure that makes up the cell membrane, the latter resulting in the ability to enhance intracellular molecular uptake. These fascinating examples reveal how the highly nonlinear electromechanical coupling associated with such high-frequency surface vibration gives rise to a variety of static and dynamic charge generation and transfer effects, in addition to molecular ordering, polarization, and assembly-remarkably, given the vast dimensional separation between the acoustic wavelength and characteristic molecular length scales, or between the MHz-order excitation frequencies and typical THz-order molecular vibration frequencies.

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Section: Electronic Manipulationmentioning

confidence: 75%

High Frequency Sonoprocessing: A New Field of Cavitation‐Free Acoustic Materials Synthesis, Processing, and Manipulation

et al. 2020

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“…We show that the coupling of the acoustic waves traveling through a chiral superconductor to these modes generates a transverse alternating (ac) current. This is reminiscent of the acoustoelectric effect (AEE), generation of an ac electric current by propagating acoustic waves in metals that was extensively studied since the 1950s [63][64][65][66][67]. Since the transverse current we find is due solely to the chirality of the superconducting order, with no applied magnetic field, we refer to this effect as "anomalous acoustoelectric effect" (AAEE).…”

mentioning

confidence: 83%

Anomalous acoustoelectric effect induced by clapping modes in chiral superconductors

Matsushita,

Mizushima,

Vekhter

et al. 2021

Preprint

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Clapping modes, which are relative amplitude and phase modes between two chiral components of Cooper pairs, are bosonic collective modes inherent to chiral superconductors. These modes behave as long-lived bosons with masses smaller than the threshold energy, 2|∆|, for decay into unbound fermion pairs. Here, we clarify that the real/imaginary clapping modes in chiral superconductors directly couple to acoustic wave propagation when the weak particle-hole asymmetry of the normal state quasiparticle dispersion is taken into account. The clapping modes driven by an acoustic wave generate an alternating electric current, that is, the acoustoelectric effect in superconductors. Significantly, the clapping modes give rise to a transverse electric current. When the sound velocity is comparable to the Fermi velocity, as in heavy fermion compounds, the transverse current is resonantly enhanced at energy below the threshold for continuum excitations. This resonance provides a smoking-gun evidence of chiral superconductivity. I. INTRODUCTIONElectric Current Acoustic wave propagation Clapping mode Acoustic wave Chiral Cooper pair Amplitude mode phase mode Clapping mode FIG. 1. Schematic image of the AAEE in chiral superconductors: Clapping excitations of chiral Cooper pairs are driven by propagating acoustic waves, leading to transverse electric current.

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“…[155] Theoretical works have proposed exciton dissociation by SAWs [156] and a valley acoustoelectric effect. [157] The previously discussed examples are treating extended sheets of layered materials; but TMDCs also host single photon emitters in the visible spectral range which were first discovered in 2015 by five groups almost at the same time. [151,[158][159][160][161] These emission centers seem to appear at random positions preferably at the edges of WSe 2 flakes as can be seen in Figure 9b.…”

Section: Artificial Atoms In Layered Materialsmentioning

confidence: 99%

“…[ 155 ] Theoretical works have proposed exciton dissociation by SAWs [ 156 ] and a valley acoustoelectric effect. [ 157 ]…”

Section: Artificial Atoms In Layered Materialsmentioning

confidence: 99%

Remote Phonon Control of Quantum Dots and Other Artificial Atoms

2021

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To exploit the full potential of chips for quantum technologies, it is worth considering all possible opportunities offered by the solid state. The aspect covered in this article is the use of phononic fields to remotely influence the optical properties of artificial atoms. The three most commonly used strain sources are discussed, that is, mechanical resonators, surface acoustic waves, and picosecond acoustic pulses. All three platforms are routinely interfaced with quantum dots and other qubits in basic research, which renders a first step toward large scale implementation in quantum applications. A central question regarding the interaction between lattice oscillations and the optically active artificial atoms deals with the characteristic time scales of the two components. The influence of this aspect on the expected optical response on the phononic driving is discussed. Besides well known semiconducting quantum dots and color centers that typically operate in the visible spectral range, the more recently discovered artificial atoms in layered van der Waals materials are discussed. Due to their flexibility and robustness, these crystals promise vast opportunities for future applications. Another important building block lies in superconducting qubits that allow to resonantly generate quantum phonon states and therefore establish the field of quantum acoustics.

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Valley Acoustoelectric Effect

Cited by 44 publications

References 53 publications

High Frequency Sonoprocessing: A New Field of Cavitation‐Free Acoustic Materials Synthesis, Processing, and Manipulation

High Frequency Sonoprocessing: A New Field of Cavitation‐Free Acoustic Materials Synthesis, Processing, and Manipulation

Anomalous acoustoelectric effect induced by clapping modes in chiral superconductors

Remote Phonon Control of Quantum Dots and Other Artificial Atoms

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