期刊
PHYSICAL REVIEW LETTERS
卷 123, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.017404
关键词
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资金
- DOE-BES Division of Chemical Sciences, Geosciences, and Biosciences Grant [DE-SC0002313]
- Feodor Lynen Fellowship Program from the Alexander von Humboldt Foundation
- U.S. Department of Energy (DOE) [DE-SC0002313] Funding Source: U.S. Department of Energy (DOE)
Photons can excite collective and single-particle excitations in metals; the collective plasmonic excitations arc of keen interest in physics, chemistry, optics, and nanotechnology because they enhance coupling of electromagnetic energy and can drive nonlinear processes in electronic materials, particularly where their dielectric function epsilon(omega) approaches zero. We investigate the nonlinear angle-resolved two-photon photoemission (2PP) spectroscopy of the Ag(111) surface through the epsilon(omega) near-zero region. In addition to the Einsteinian single-particle photoemission, the 2PP spectra report unequivocal signatures of nonlocal dielectric, plasmonically enhanced, excitation processes.
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