Piezoelectric Modulation of Excitonic Properties in Monolayer WSe<sub>2</sub> under Strong Dielectric Screening

Datta, Kanak; Li, Zidong; Lyu, Zhengyang; Deotare, Parag B.

doi:10.1021/acsnano.1c04269

Cited by 20 publications

(15 citation statements)

References 61 publications

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“…A thin layer of indium-tin-oxide (ITO) was deposited on the heterostructure region as a top transparent electrode. This top electrode plays an important role by efficiently suppressing the in-plane piezoelectric field component (E x ), which may cause exciton dissociation 14,[41][42][43] , while maintaining a relatively strong out-of-plane field component E z . The finiteelement method (FEM) simulation (Fig.…”

Section: Resultsmentioning

confidence: 99%

Long-range transport of 2D excitons with acoustic waves

Peng

Ripin

et al. 2022

Nat Commun

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Excitons are elementary optical excitation in semiconductors. The ability to manipulate and transport these quasiparticles would enable excitonic circuits and devices for quantum photonic technologies. Recently, interlayer excitons in 2D semiconductors have emerged as a promising candidate for engineering excitonic devices due to their long lifetime, large exciton binding energy, and gate tunability. However, the charge-neutral nature of the excitons leads to weak response to the in-plane electric field and thus inhibits transport beyond the diffusion length. Here, we demonstrate the directional transport of interlayer excitons in bilayer WSe2 driven by the propagating potential traps induced by surface acoustic waves (SAW). We show that at 100 K, the SAW-driven excitonic transport is activated above a threshold acoustic power and reaches 20 μm, a distance at least ten times longer than the diffusion length and only limited by the device size. Temperature-dependent measurement reveals the transition from the diffusion-limited regime at low temperature to the acoustic field-driven regime at elevated temperature. Our work shows that acoustic waves are an effective, contact-free means to control exciton dynamics and transport, promising for realizing 2D materials-based excitonic devices such as exciton transistors, switches, and transducers up to room temperature.

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Section: Resultsmentioning

confidence: 99%

Long-range transport of 2D excitons with acoustic waves

Peng

Ripin

et al. 2022

Nat Commun

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“…In the interim of our review process we became aware of similar experiments reported for acoustic transport in WSe 2 MLs at room temperature …”

mentioning

confidence: 82%

Acoustically Driven Stark Effect in Transition Metal Dichalcogenide Monolayers

et al. 2021

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The Stark effect is one of the most efficient mechanisms to manipulate many-body states in nanostructured systems. In mono- and few-layer transition metal dichalcogenides, it has been successfully induced by optical and electric field means. Here, we tune the optical emission energies and dissociate excitonic states in MoSe2 monolayers employing the 220 MHz in-plane piezoelectric field carried by surface acoustic waves. We transfer the monolayers to high dielectric constant piezoelectric substrates, where the neutral exciton binding energy is reduced, allowing us to efficiently quench (above 90%) and red-shift the excitonic optical emissions. A model for the acoustically induced Stark effect yields neutral exciton and trion in-plane polarizabilities of 530 and 630 × 10–5 meV/(kV/cm)2, respectively, which are considerably larger than those reported for monolayers encapsulated in hexagonal boron nitride. Large in-plane polarizabilities are an attractive ingredient to manipulate and modulate multiexciton interactions in two-dimensional semiconductor nanostructures for optoelectronic applications.

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“…This implies a practical approach for tuning the electrical properties in advanced electronic devices such as strain sensors. 294 Supported by this theoretical prediction, He et al 290 applied uniaxial tensile strain along zigzag and armchair directions (Figure 21b) to continuously tune the electronic structure of atomically thin MoS 2 . When strain was loaded to MoS 2 , a red shift in optical absorption could be witnessed along both zigzag and armchair directions due to reduced band gap, as shown in Figure 21c.…”

Section: Effect Of Strain On Energymentioning

confidence: 94%

“…In addition, the electron effective mass was found to be reduced under strain, thus resulting in enhanced carrier mobility. This implies a practical approach for tuning the electrical properties in advanced electronic devices such as strain sensors . Supported by this theoretical prediction, He et al applied uniaxial tensile strain along zigzag and armchair directions (Figure b) to continuously tune the electronic structure of atomically thin MoS 2 .…”

Section: Intrinsic Photonic Properties Of 2d Materialsmentioning

confidence: 96%

Engineering van der Waals Materials for Advanced Metaphotonics

Lin

Zhang

et al. 2022

Chem. Rev.

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The outstanding chemical and physical properties of 2D materials, together with their atomically thin nature, make them ideal candidates for metaphotonic device integration and construction, which requires deep subwavelength light–matter interaction to achieve optical functionalities beyond conventional optical phenomena observed in naturally available materials. In addition to their intrinsic properties, the possibility to further manipulate the properties of 2D materials via chemical or physical engineering dramatically enhances their capability, evoking new science on light–matter interaction, leading to leaped performance of existing functional devices and giving birth to new metaphotonic devices that were unattainable previously. Comprehensive understanding of the intrinsic properties of 2D materials, approaches and capabilities for chemical and physical engineering methods, the resulting property modifications and novel functionalities, and applications of metaphotonic devices are provided in this review. Through reviewing the detailed progress in each aspect and the state-of-the-art achievement, insightful analyses of the outstanding challenges and future directions are elucidated in this cross-disciplinary comprehensive review with the aim to provide an overall development picture in the field of 2D material metaphotonics and promote rapid progress in this fast emerging and prosperous field.

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Piezoelectric Modulation of Excitonic Properties in Monolayer WSe₂ under Strong Dielectric Screening

Cited by 20 publications

References 61 publications

Long-range transport of 2D excitons with acoustic waves

Long-range transport of 2D excitons with acoustic waves

Acoustically Driven Stark Effect in Transition Metal Dichalcogenide Monolayers

Engineering van der Waals Materials for Advanced Metaphotonics

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Piezoelectric Modulation of Excitonic Properties in Monolayer WSe2 under Strong Dielectric Screening

Cited by 20 publications

References 61 publications

Long-range transport of 2D excitons with acoustic waves

Long-range transport of 2D excitons with acoustic waves

Acoustically Driven Stark Effect in Transition Metal Dichalcogenide Monolayers

Engineering van der Waals Materials for Advanced Metaphotonics

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Product

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Piezoelectric Modulation of Excitonic Properties in Monolayer WSe₂ under Strong Dielectric Screening