Dynamic Optical Tuning of Interlayer Interactions in the Transition Metal Dichalcogenides
| Autor: | Kyle L. Seyler, Sefaattin Tongay, John R. Tolsma, Apurva Mehta, Tony F. Heinz, James M. Glownia, Haidan Wen, David J. Singh, Meng-Ju Sher, Yu Lin, I-Cheng Tung, Archana Raja, Sanghoon Song, Linyou Cao, Anthony DiChiara, Allan H. MacDonald, Genevieve Clark, Mannebach Ehren, Yao Li, Yifei Yu, Jifeng Sun, Michael Kozina, Wendy L. Mao, Diling Zhu, Yinsheng Guo, Qi Zhang, Aaron M. Lindenberg, Friederike Ernst, Ozgur Burak Aslan, Evan J. Reed, Anupum Pant, Hua Zhou, Xiaodong Xu, Silke Nelson, Clara Nyby, Yao Zhou |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Condensed matter physics Mechanical Engineering Bioengineering 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Stress (mechanics) Casimir effect symbols.namesake Transition metal Modulation 0103 physical sciences Femtosecond symbols General Materials Science van der Waals force 010306 general physics 0210 nano-technology Ultrashort pulse Excitation |
| Zdroj: | Nano Letters. 17:7761-7766 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.7b03955 |
| Popis: | Modulation of weak interlayer interactions between quasi-two-dimensional atomic planes in the transition metal dichalcogenides (TMDCs) provides avenues for tuning their functional properties. Here we show that above-gap optical excitation in the TMDCs leads to an unexpected large-amplitude, ultrafast compressive force between the two-dimensional layers, as probed by in situ measurements of the atomic layer spacing at femtosecond time resolution. We show that this compressive response arises from a dynamic modulation of the interlayer van der Waals interaction and that this represents the dominant light-induced stress at low excitation densities. A simple analytic model predicts the magnitude and carrier density dependence of the measured strains. This work establishes a new method for dynamic, nonequilibrium tuning of correlation-driven dispersive interactions and of the optomechanical functionality of TMDC quasi-two-dimensional materials. |
| Databáze: | OpenAIRE |
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