Strain control of exciton and trion spin-valley dynamics in monolayer transition metal dichalcogenides

An, Zhisheng; Soubelet, Pedro; Y., Zhumagulov,; Zopf, Michael; Delhomme, Alex; Qian, Chenjiang; Faria, Paulo E.; Fabian, Jaroslav; Cao, Xin; Yang, Jingzhong; Stier, Andreas V.; Ding, Fei; Finley, Jonathan J.

doi:10.1103/physrevb.108.l041404

Cited by 6 publications

(7 citation statements)

References 90 publications

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“…The slope of these linear fits yields the gauge factors presented in Table . (b) Comparison of the maximum energy blueshift of the bandgap energy and gauge factor values obtained in this work with those from other works on biaxial compressive strain. − The bandgap energy shift is assumed to be the same as for X A when it applies. For a fair comparison, the effect of temperature has been removed in other thermal compression experiments using the same method applied to our data.…”

Section: Resultsmentioning

confidence: 90%

“…The effects of larger, nonuniform, biaxial tensile strain on the optical properties of TMDs have also been explored by nanoindentation methods and by pressurizing single-layer membranes. , Some of these methods have also been applied to explore the impact of tensile strain on the binding energies and valley selectivity of excitonic species in single-layer TMDs. − However, experimental methods to apply compressive strain and to study its effects on the properties of 2D materials are limited. Apart from hydrostatic pressure techniques, piezoelectric actuators have been recently employed to transfer modest amounts of purely biaxial compressive strain (∼0.3%). , An alternative method for generating larger, homogeneous, biaxial compressive strain involves transferring it from substrates with large thermal expansion coefficients. This approach enables strain modulation through sample temperature control and has been recently applied to strain engineering of 2D materials. − For instance, the effect of compressive strain in the photoresponse of MoS 2 on polycarbonate has been investigated by cooling down to 80 K …”

Section: Introductionmentioning

confidence: 99%

“…Apart from hydrostatic pressure techniques, 28 piezoelectric actuators have been recently employed to transfer modest amounts of purely biaxial compressive strain (∼0.3%). 37 , 38 An alternative method for generating larger, homogeneous, biaxial compressive strain involves transferring it from substrates with large thermal expansion coefficients. This approach enables strain modulation through sample temperature control and has been recently applied to strain engineering of 2D materials.…”

Section: Introductionmentioning

confidence: 99%

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Large Biaxial Compressive Strain Tuning of Neutral and Charged Excitons in Single-Layer Transition Metal Dichalcogenides

Henríquez-Guerra,

Li,

Pasqués-Gramage

et al. 2023

ACS Appl. Mater. Interfaces

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The absorption and emission of light in single-layer transition metal dichalcogenides are governed by the formation of excitonic quasiparticles. Strain provides a powerful technique to tune the optoelectronic properties of two-dimensional materials and thus to adjust their exciton energies. The effects of large compressive strain in the optical spectrum of two-dimensional (2D) semiconductors remain rather unexplored compared to those of tensile strain, mainly due to experimental constraints. Here, we induced large, uniform, biaxial compressive strain (∼1.2%) by cooling, down to 10 K, single-layer WS 2 , MoS 2 , WSe 2 , and MoSe 2 deposited on polycarbonate substrates. We observed a significant strain-induced modulation of neutral exciton energies, with blue shifts up to 160 meV, larger than in any previous experiments. Our results indicate a remarkably efficient transfer of compressive strain, demonstrated by gauge factor values exceeding previous results and approaching theoretical expectations. At low temperatures, we investigated the effect of compressive strain on the resonances associated with the formation of charged excitons. In WS 2 , a notable reduction of gauge factors for charged compared to neutral excitons suggests an increase in their binding energy, which likely results from the effects of strain added to the influence of the polymeric substrate.

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Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Large Biaxial Compressive Strain Tuning of Neutral and Charged Excitons in Single-Layer Transition Metal Dichalcogenides

Henríquez-Guerra,

Li,

Pasqués-Gramage

et al. 2023

ACS Appl. Mater. Interfaces

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“…As shown in figure 2c, P C changes from < 10% to > 60% at carrier density (n) of ∼ 4 × 10 12 cm −2 (six-fold enhancement) then gradually decreases and finally saturates at ∼ 30 % after ∼ 8 × 10 12 cm −2 . Earlier studies have shown that the modulation of P C of neutral (X) and charged (T ) states can be implemented with gate voltage [17,18], temperature [18], screening [19], strain [20] or magnetic field [21]. Importantly, the modulation of the neutral states by electrostatic doping is limited to the low carrier density regime only.…”

Section: Resultsmentioning

confidence: 99%

“…Earlier studies have shown that the modulation of valley polarization of neutral and charged states can be implemented with gate voltage [17,18], temperature [18], screening [19], strain [20] or magnetic field [21] but simultaneous electrical control along with the polarized photon yield remains a challenge. Moreover, the majority of the strategies implemented to achieve external control with valley-polarized excitons compromise the photon yield due to different non-radiative losses.…”

Section: Introductionmentioning

confidence: 99%

Electrical control of valley polarized charged biexcitons in monolayer WS2

Das,

Huang,

Verzhbitskiy

et al. 2024

Preprint

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Excitons are key to the optoelectronic applications of van der Waals semiconductors with the potential for versatile on-demand tuning of properties. Yet, their electrical manipulation is complicated by their inherent charge neutrality and the additional loss channels induced by electrical doping. We demonstrate the dynamic control of valley polarization in charged biexciton (quinton) states of monolayer tungsten disulfide, achieving up to a sixfold increase in the degree of circular polarization under off-resonant excitation. In contrast to the weak direct tuning of excitons typically observed using electrical gating, the quinton photoluminescence remains stable, even with increased scattering from electron doping. By exciting at the exciton resonances, we observed the reproducible non-monotonic switching of the charged state population as the electron doping is varied under gate bias, indicating a coherent interplay between neutral and charged exciton states.

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Optically Addressing Exciton Spin and Pseudospin in Nanomaterials for Spintronics Applications

Lubert-Perquel,

Acharya,

Johnson

2023

ACS Appl. Opt. Mater.

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Oriented exciton spins that can be generated and manipulated optically are of interest for a range of applications, including spintronics, quantum information science, and neuromorphic computing architectures. Although materials that host such excitons often lack practical coherence times for use on their own, strategic transduction of the magnetic information across interfaces can combine fast modulation with longer-term storage and readout. Several nanostructure systems have been put forward due to their interesting magneto-optical properties and their possible manipulation using circularly polarized light. These material systems are presented here, namely two-dimensional (2D) systems due to the unique spin-valley coupling properties and quantum dots for their exciton fine structure. 2D magnets are also discussed for their anisotropic spin behavior and extensive 2D magnetic states that are not yet fully understood but could pave the way for emergent techniques of magnetic control. This review also details the experimental and theoretical tools to measure and understand these systems along with a discussion on the progress of optical manipulation of spins and magnetic order transitions.

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Strain control of exciton and trion spin-valley dynamics in monolayer transition metal dichalcogenides

Cited by 6 publications

References 90 publications

Large Biaxial Compressive Strain Tuning of Neutral and Charged Excitons in Single-Layer Transition Metal Dichalcogenides

Large Biaxial Compressive Strain Tuning of Neutral and Charged Excitons in Single-Layer Transition Metal Dichalcogenides

Electrical control of valley polarized charged biexcitons in monolayer WS2

Optically Addressing Exciton Spin and Pseudospin in Nanomaterials for Spintronics Applications

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