Strong phonon-coupled trion emission in Janus homobilayer

Tianyishan Sun; Dingkun Bi; Haonan Wang; Hiroto Ogura; Yanlin Gao; Mina Maruyama; Susumu Okada; Shiro Entani; Kenji Watanabe; Takashi Taniguchi; Kazunari Matsuda; Toshiaki Kato

arXiv · 2611.09083

Strong phonon-coupled trion emission in Janus homobilayer

Tianyishan Sun·Dingkun Bi·Haonan Wang·Hiroto Ogura·Yanlin Gao·Mina Maruyama·Susumu Okada·Shiro Entani·Kenji Watanabe·Takashi Taniguchi·Kazunari Matsuda·Toshiaki Kato

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Abstract

Janus transition metal dichalcogenides with broken mirror symmetry provide a novel platform for exploring many-body effects mediated by spin-valley-phonon interactions. Strong electron-phonon coupling demands a precise match between a strong effective dipole moment and nanometer-scale charge confinement. Here, we report thermally robust and enhanced trion emission in a symmetric bilayer WSeS with an S/S stacking configuration. The inward-pointing antiparallel built-in electric fields induce a strong electron confinement effect at the interface, driving dominant trion emission at cryogenic temperatures. Furthermore, a massive electron-phonon coupling strength (3.9) resonant with the optical phonon A_1^2 energy (51 meV) contributes to the thermal stability of this trion emission at elevated temperatures. By tailoring the interfacial architecture in Janus WSeS homobilayers, this study overcomes the thermal decoherence limits inherent to traditional semiconductor systems, offering novel insights into room-temperature many-body interactions.

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Tianyishan Sun, Dingkun Bi, Haonan Wang, Hiroto Ogura, Yanlin Gao, Mina Maruyama, Susumu Okada, Shiro Entani, Kenji Watanabe, Takashi Taniguchi, Kazunari Matsuda, Toshiaki Kato. 2026-11-06. Strong phonon-coupled trion emission in Janus homobilayer. https://arxiv.org/abs/2611.09083

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