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This study demonstrates how in-plane anisotropy in van der Waals semiconductors enhances excitonic coherence resilience against thermal and density fluctuations, enabling measurable quantum features at room temperature. By quantifying dephasing mechanisms through transient micro-four-wave mixing spectroscopy, the research identifies pathways to stabilize coherent superpositions for practical quantum photonic devices. These findings advance the material science foundation required for scalable quantum information processing in two-dimensional systems.
Robust Excitonic Coherence Driven by In-Plane Anisotropy in a van der Waals Semiconductor
arXiv:2411.13695v2 Announce Type: replace-cross Abstract: The discovery of in-plane anisotropic excitons in van der Waals semiconductors enables state-of-the-art nanophotonic applications. A key parameter of these quasiparticles is the coherence time (T2), which measures quantum dephasing and determines how long coherent superpositions can be preserved - critical for quantum photonic and excitonic technologies. In particular, such systems pose fundamental questions about how anisotropy influences coherence properties. Here, we employ transient micro-four-wave mixing spectroscopy to study the coherence and population dynamics (T_1) of excitons at resonance in pristine layered rhenium disulfide. We probe and quantify the dephasing induced by many-body excitonic scattering processes, revealing signatures of anisotropy and one-dimensional features. This results in notable decoherence resilience against variations in optical excitation density and temperature, enabling measurables quantum features even at room temperature. Additionally, the absence of photon echo signals highlights the homogeneous nature of excitonic transitions in ReS2 and reflects a low level of disorder across few-layer to bulk-like flakes. These findings open further exploration of in-plane anisotropy-driven decoherence in van der Waals materials, while creating valuable possibilities for quantum-based applications.
Abstract:The discovery of in-plane anisotropic excitons in van der Waals semiconductors enables state-of-the-art nanophotonic applications. A key parameter of these quasiparticles is the coherence time (T2), which measures quantum dephasing and determines how long coherent superpositions can be preserved - critical for quantum photonic and excitonic technologies. In particular, such systems pose fundamental questions about how anisotropy influences coherence properties. Here, we employ transient micro-four-wave mixing spectroscopy to study the coherence and population dynamics (T_1) of excitons at resonance in pristine layered rhenium disulfide. We probe and quantify the dephasing induced by many-body excitonic scattering processes, revealing signatures of anisotropy and one-dimensional features. This results in notable decoherence resilience against variations in optical excitation density and temperature, enabling measurables quantum features even at room temperature. Additionally, the absence of photon echo signals highlights the homogeneous nature of excitonic transitions in ReS2 and reflects a low level of disorder across few-layer to bulk-like flakes. These findings open further exploration of in-plane anisotropy-driven decoherence in van der Waals materials, while creating valuable possibilities for quantum-based applications.
Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Optics (physics.optics); Quantum Physics (quant-ph)
arXiv:2411.13695 [cond-mat.mes-hall]
(or arXiv:2411.13695v2 [cond-mat.mes-hall] for this version)
https://doi.org/10.48550/arXiv.2411.13695 Focus to learn more arXiv-issued DOI via DataCite
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