Valley Polarization-Electric Dipole Interference and Nonlinear Chiral Selection Rules in Monolayer WSe
arXiv:2310.16549 · doi:10.1038/s41566-024-01591-z
Abstract
In monolayer transition metal dichalcogenides time-reversal symmetry, combined with space-inversion symmetry, defines the spin-valley degree of freedom. As such, engineering and control of time-reversal symmetry by optical or magnetic fields constitutes the foundation of valleytronics. Here, we propose a new approach for the detection of broken time-reversal symmetry and valley polarization in monolayer WSe based on second harmonic generation. Our method can selectively and simultaneously generate and detect a valley polarization at the valleys of transition metal dichalcogenides at room temperature. Furthermore, it allows to measure the interference between the real and imaginary parts of the intrinsic (electric dipole) and valley terms of the second order nonlinear susceptibility. This work demonstrates the potential and unique capabilities of nonlinear optics as a probe of broken time-reversal symmetry and as a tool for ultrafast and non-destructive valleytronic operations.
27 pages 6 figures
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Cited by in corpus (10)
- Roadmap for Photonics with 2D Materials
- Nonlinear optics in 2D materials: from classical to quantum
- Photonics in Flatland: Challenges and Opportunities for Nanophotonics with 2D Semiconductors
- Linear and Nonlinear Optical Properties of Molecules from Real-Time Propagation Based on the Bethe-Salpeter Equation
- Direct measurement of broken time-reversal symmetry in centrosymmetric and non-centrosymmetric atomically thin crystals with nonlinear Kerr rotation
- Ultrafast Coherent Bandgap Modulation Probed by Parametric Nonlinear Optics
- Valley Gapless Semiconductor: Models and Applications
- Ultrafast acoustic modulation of second-harmonic generation in monolayer transition metal dichalcogenides
- Temporal modulation of second harmonic generation in ferroelectrics by a pulsed electric field
- Quantum valley pseudospin controlled by strain