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arXiv · 2610.11212

Light-induced interlayer spacing dynamics via orbital phonon coupling

Wenwen Mao·Hanbyul Kim·Angel Rubio·Dongbin Shin
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Abstract

Interlayer coupling controls the electronic properties of layered van der Waals transition metal dichalcogenides. We investigate light-induced control of the interlayer spacing through orbital-selective excitation in trilayer 1T'-WSe2 and 1T'-WS2. Real-time time-dependent density functional theory simulations show that the interlayer spacing contracts or expands depending on whether chalcogen p-orbital density is depleted from or accumulated in the interlayer region. Effective Lindblad models coupled to the lattice dynamics reproduce these contrasting responses with simplified dynamics. A single effective excited state captures the cosine-like displacive motion in trilayer 1T'-WSe2, whereas the shift of the equilibrium spacing in trilayer 1T'-WS2 requires two excited states with different electron-phonon couplings and relaxation channels. Static calculations at varied interlayer spacings indicate that these spacing changes modify the electronic gaps and could access different electronic phases. These results connect orbital redistribution, carrier relaxation, and interlayer breathing motion, and establish orbital-selective optical excitation as a route to tuning the electronic properties of layered materials.

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Wenwen Mao, Hanbyul Kim, Angel Rubio, Dongbin Shin. 2026-10-08. Light-induced interlayer spacing dynamics via orbital phonon coupling. https://arxiv.org/abs/2610.11212

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