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1. Tunable interlayer excitons and switchable interlayer trions via dynamic near-field cavity

   https://doi.org/10.1038/s41377-023-01087-5  

   Koo, Yeonjeong; Lee, Hyeongwoo; Ivanova, Tatiana; Kefayati, Ali; Perebeinos, Vasili; Khestanova, Ekaterina; Kravtsov, Vasily; Park, Kyoung-Duck (December 2023, Light: Science & Applications)

   Abstract Emerging photo-induced excitonic processes in transition metal dichalcogenide (TMD) heterobilayers, e.g., interplay of intra- and inter-layer excitons and conversion of excitons to trions, allow new opportunities for ultrathin hybrid photonic devices. However, with the associated large degree of spatial heterogeneity, understanding and controlling their complex competing interactions in TMD heterobilayers at the nanoscale remains a challenge. Here, we present an all-round dynamic control of interlayer-excitons and -trions in a WSe 2 /Mo 0.5  W 0.5  Se 2 heterobilayer using multifunctional tip-enhanced photoluminescence (TEPL) spectroscopy with <20 nm spatial resolution. Specifically, we demonstrate the bandgap tunable interlayer excitons and the dynamic interconversion between interlayer-trions and -excitons, through the combinational tip-induced engineering of GPa-scale pressure and plasmonic hot electron injection, with simultaneous spectroscopic TEPL measurements. This unique nano-opto-electro-mechanical control approach provides new strategies for developing versatile nano-excitonic/trionic devices using TMD heterobilayers. 

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2. Interlayer Exciton Diode and Transistor

   https://doi.org/10.1021/acs.nanolett.2c01905  

   Shanks, Daniel N.; Mahdikhanysarvejahany, Fateme; Stanfill, Trevor G.; Koehler, Michael R.; Mandrus, David G.; Taniguchi, Takashi; Watanabe, Kenji; LeRoy, Brian J.; Schaibley, John R. (August 2022, Nano Letters)
3. Interlayer Exciton Diode and Transistor

   https://doi.org/10.48550/arXiv.2203.09444  

   Shanks, Daniel N.; Mahdikhanysarvejahany, Fateme; Stanfill, Trevor; Koehler, Michael R.; Mandrus, David G.; Taniguchi, Takashi; Watanabe, Kenji; LeRoy, Brian J.; Schaibley, John R. (March 2022, ArXivorg)
4. Opportunities and challenges of interlayer exciton control and manipulation

   https://doi.org/10.1038/s41565-018-0301-1  

   Mak, Kin Fai; Shan, Jie (November 2018, Nature Nanotechnology)
5. Interlayer magnetophononic coupling in MnBi2Te4

   https://doi.org/10.1038/s41467-022-29545-5  

   Padmanabhan, Hari; Poore, Maxwell; Kim, Peter K.; Koocher, Nathan Z.; Stoica, Vladimir A.; Puggioni, Danilo; Hugo) Wang, Huaiyu; Shen, Xiaozhe; Reid, Alexander H.; Gu, Mingqiang; et al (December 2022, Nature Communications)

   Abstract The emergence of magnetism in quantum materials creates a platform to realize spin-based applications in spintronics, magnetic memory, and quantum information science. A key to unlocking new functionalities in these materials is the discovery of tunable coupling between spins and other microscopic degrees of freedom. We present evidence for interlayer magnetophononic coupling in the layered magnetic topological insulator MnBi 2 Te 4 . Employing magneto-Raman spectroscopy, we observe anomalies in phonon scattering intensities across magnetic field-driven phase transitions, despite the absence of discernible static structural changes. This behavior is a consequence of a magnetophononic wave-mixing process that allows for the excitation of zone-boundary phonons that are otherwise ‘forbidden’ by momentum conservation. Our microscopic model based on density functional theory calculations reveals that this phenomenon can be attributed to phonons modulating the interlayer exchange coupling. Moreover, signatures of magnetophononic coupling are also observed in the time domain through the ultrafast excitation and detection of coherent phonons across magnetic transitions. In light of the intimate connection between magnetism and topology in MnBi 2 Te 4 , the magnetophononic coupling represents an important step towards coherent on-demand manipulation of magnetic topological phases. 

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