Coherent Phononics of van der Waals Layers on Nanogratings

Wu, Yan; Akimov, A. V.; Barra-Burillo, María; Bayer, М.; Bradford, Jonathan; Gusev, Vitalyi; Hueso, Luis E.; Kent, A. J.; Kukhtaruk, S. M.; Nadzeyka, Achim; Patanè, A.; Rushforth, A. W.; Scherbakov, A. V.; Yaremkevich, Dmytro D.; Linnik, T. L.

doi:10.1021/acs.nanolett.2c01542

Cited by 8 publications

(3 citation statements)

References 38 publications

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“…The lattice units can expand and shrink under the irritation of the pulsed laser, and eventually elastic acoustic waves are formed. When the nanosheet thickness is much smaller than the sound wavelength (as in our case), two acoustic Lamb waves (symmetric and antisymmetric) can arise and propagate over the surface of the nanosheet 40 . These waves induce translational displacement of the material, and thus can move the nanosheet when its connection to the substrate is weakened [22][23][24] .…”

Section: Photoacoustic Mechanismsmentioning

confidence: 86%

Photoacoustic 2D actuator via femtosecond pulsed laser action on van der Waals interfaces

et al. 2023

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Achieving optically controlled nanomachine engineering can satisfy the touch-free and non-invasive demands of optoelectronics, nanotechnology, and biology. Traditional optical manipulations are mainly based on optical and photophoresis forces, and they usually drive particles in gas or liquid environments. However, the development of an optical drive in a non-fluidic environment, such as on a strong van der Waals interface, remains difficult. Herein, we describe an efficient 2D nanosheet actuator directed by an orthogonal femtosecond laser, where 2D VSe2 and TiSe2 nanosheets deposited on sapphire substrates can overcome the interface van der Waals forces (tens and hundreds of megapascals of surface density) and move on the horizontal surfaces. We attribute the observed optical actuation to the momentum generated by the laser-induced asymmetric thermal stress and surface acoustic waves inside the nanosheets. 2D semimetals with high absorption coefficient can enrich the family of materials suitable to implement optically controlled nanomachines on flat surfaces.

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Section: Photoacoustic Mechanismsmentioning

confidence: 86%

Photoacoustic 2D actuator via femtosecond pulsed laser action on van der Waals interfaces

et al. 2023

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“…Examples of high-frequency ANCs include superlattices, which localize phonons with frequencies lying in the acoustic stop-bands, , and membranes fabricated from various semiconductors (e.g., Si, , GaAs, GaN). Unique sub-THz and THz acoustic properties have been revealed in nanolayer-related heterostructures fabricated from van der Waals (vdW) materials like graphene, transition metal dichalcogenides (TMDs), − and others. , VdW nanolayers, which are easily fabricated by exfoliation techniques, enable ANCs to reach f ∼ 1 THz and quality factor Q > 10 3 so that f × Q reaches the record value of 10 14 Hz , (for lower frequency nanomechanical properties, see review). Such high finesse at extremely high acoustic frequencies leads to a new paradigm in the engineering of high-frequency communication and quantum devices.…”

Section: Introductionmentioning

confidence: 99%

“…In the previous studies − of vdW-based ANCs, the main task was to increase the frequency and decay time of the generated coherent LA acoustic phonons while the efficiency of their generation and detection did not get much attention. Nevertheless, the amplitude of the signal induced by coherent phonon oscillations generated and detected in ANCs is the most important parameter for exploiting vdW ANCs in practical devices.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photon–Phonon Interaction in WSe₂ Acoustic Nanocavities

Carr,

Ruppert,

Samusev

et al. 2024

ACS Photonics

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Acoustic nanocavities (ANCs) with resonance frequencies much above 1 GHz are prospective to be exploited in sensors and quantum operating devices. Nowadays, acoustic nanocavities fabricated from van der Waals (vdW) nanolayers allow them to exhibit resonance frequencies of the breathing acoustic mode up to f ∼ 1 THz and quality factors up to Q ∼ 10 3 . For such high acoustic frequencies, electrical methods fail, and optical techniques are used for the generation and detection of coherent phonons. Here, we study experimentally acoustic nanocavities fabricated from WSe 2 layers with thicknesses from 8 up to 130 nm deposited onto silica colloidal crystals. The substrate provides a strong mechanical support for the layers while keeping their acoustic properties the same as in membranes. We concentrate on experimental and theoretical studies of the amplitude of the optically measured acoustic signal from the breathing mode, which is the most important characteristic for acousto-optical devices. We probe the acoustic signal optically with a single wavelength in the vicinity of the exciton resonance and measure the relative changes in the reflectivity induced by coherent phonons up to 3 × 10 −4 for f ∼ 100 GHz. We reveal the enhancement of photon−phonon interaction for a wide range of acoustic frequencies and show high sensitivity of the signal amplitude to the photoelastic constants governed by the deformation potential and dielectric function for photon energies near the exciton resonance. We also reveal a resonance in the photoelastic response (we call it photoelastic resonance) in the nanolayers with thickness close to the Bragg condition. The estimates show the capability of acoustic nanocavities with an exciton resonance for operations with high-frequency single phonons at an elevated temperature.

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Emerging Spintronic Materials and Functionalities

Guo

et al. 2023

Advanced Materials

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The explosive growth of the information era has put forward urgent requirements for ultra‐high‐speed and extremely efficient computations. In direct contrary to charge‐based computations, spintronics aims to use spins as information carriers for data storage, transmission, and decoding, to help fully realize electronic device miniaturization and high integration for next‐generation computing technologies. Currently, many novel spintronic materials have been developed with unique properties and multi‐functionalities, including organic semiconductors (OSCs), organic‐inorganic hybrid perovskites (OIHPs), and two‐dimensional materials (2DMs). These materials are useful to fulfil the demand for developing diverse and advanced spintronic devices. Herein, we systematically reviewed these promising materials for advanced spintronic applications. Due to the distinct chemical and physical structures of OSCs, OIHPs, and 2DMs, their spintronic properties (spin transport and spin manipulation) were discussed separately. In addition, some multifunctionalities due to photoelectric and chiral‐induced spin selectivity (CISS) were overviewed, including the spin‐filter effect, spin‐photovoltaics, spin‐light emitting devices, and spin‐transistor functions. Subsequently, we presented challenges and future perspectives of using these multifunctional materials for the development of advanced spintronics.This article is protected by copyright. All rights reserved

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Coherent Phononics of van der Waals Layers on Nanogratings

Cited by 8 publications

References 38 publications

Photoacoustic 2D actuator via femtosecond pulsed laser action on van der Waals interfaces

Photoacoustic 2D actuator via femtosecond pulsed laser action on van der Waals interfaces

Enhanced Photon–Phonon Interaction in WSe₂ Acoustic Nanocavities

Emerging Spintronic Materials and Functionalities

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Coherent Phononics of van der Waals Layers on Nanogratings

Cited by 8 publications

References 38 publications

Photoacoustic 2D actuator via femtosecond pulsed laser action on van der Waals interfaces

Photoacoustic 2D actuator via femtosecond pulsed laser action on van der Waals interfaces

Enhanced Photon–Phonon Interaction in WSe2 Acoustic Nanocavities

Emerging Spintronic Materials and Functionalities

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Enhanced Photon–Phonon Interaction in WSe₂ Acoustic Nanocavities