期刊
SCIENCE
卷 371, 期 6529, 页码 617-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abe9163
关键词
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资金
- Programmable Quantum Materials, an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0019443]
- Moore Investigator in Quantum Materials EPIQS [9455]
- Vannevar Bush Faculty Fellowship [N00014-19-1-2630]
- European Research Council [ERC-2015-AdG694097]
- Cluster of Excellence Advanced Imaging of Matter (AIM)
- Flatiron Institute, a division of the Simons Foundation
- Alexander von Humboldt foundation
- National Research Foundation of Korea through the Global Research Laboratory (GRL) program [2016K1A1A2912707]
- NSF MRSEC Program through Columbia in the Center for PrecisionAssembled Quantum Materials [DMR-2011738]
Layered crystals, such as tungsten diselenide, can exhibit unconventional optical properties that allow for the propagation of subdiffractional waveguide modes with hyperbolic dispersion. This study demonstrates optically induced hyperbolicity in WSe2 and explores the role of quantum transitions of excitons in the observed polaritonic response.
Collective electronic modes or lattice vibrations usually prohibit propagation of electromagnetic radiation through the bulk of common materials over a frequency range associated with these oscillations. However, this textbook tenet does not necessarily apply to layered crystals. Highly anisotropic materials often display nonintuitive optical properties and can permit propagation of subdiffractional waveguide modes, with hyperbolic dispersion, throughout their bulk. Here, we report on the observation of optically induced electronic hyperbolicity in the layered transition metal dichalcogenide tungsten diselenide (WSe2). We used photoexcitation to inject electron-hole pairs in WSe2 and then visualized, by transient nanoimaging, the hyperbolic rays that traveled along conical trajectories inside of the crystal. We establish here the signatures of programmable hyperbolic electrodynamics and assess the role of quantum transitions of excitons within the Rydberg series in the observed polaritonic response.
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