Direct measurement of interlayer exciton absorption in MoSe<sub>2</sub>/WSe<sub>2</sub> heterostructures
ORAL
Abstract
Direct coupling of light and interlayer excitons (ILX) in transition metal dichalcogenides heterostructures has been sought after for both fundamental and applied purposes because of the interlayer excitons’ sensitivity to the interface details, electrical tunability [1,2], and long lifetimes [2]. However, since ILX absorption is weak, most of its investigations have used photoluminescence [1,2] or inferred absorption data from excitation spectra [3,4]. In this work, we present direct measurements of the ILX absorption resonances in MoSe2/WSe2 heterostructures for different twist angles using an electromodulation technique. We determine the energies, electric-dipole moments, and oscillator strengths of interlayer exciton states. We compare the absorption spectra with emission spectra from ILXs to first-principle calculations to assign the observed features.
References: [1] O. Karni et al., PRL. (2019) [2] A. Jauregui et al., Science 366 (2019). [3] S. Ross et al., Nano Lett. (2017) [4] C. Jin et al., Nat. Phys. 15 (2019)
References: [1] O. Karni et al., PRL. (2019) [2] A. Jauregui et al., Science 366 (2019). [3] S. Ross et al., Nano Lett. (2017) [4] C. Jin et al., Nat. Phys. 15 (2019)
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Presenters
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Elyse Barre
- Stanford University
- Stanford Univ