期刊
PHYSICAL REVIEW B
卷 87, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.085126
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资金
- National Science Council of Taiwan [NSC99-2112-M-002-027-MY3, NSC101-2811-M-002-130]
Plasmons dispersion and nonvertical interband transitions in Bi2Se3 single crystals were investigated by electron energy-loss spectroscopy in conjunction with (scanning) transmission electron microscopy [(S)TEM-EELS]. Both volume plasmons (pi plasmon at 7 eV and pi + sigma plasmon at 17 eV) and surface plasmons (similar to 5.5 and 10 eV) were demonstrated in STEM-EELS spectra and the corresponding spectral imaging in real space. In further EELS experiments in reciprocal space, the momentum-dependent spectra reveal very different dispersion behavior between pi and pi + sigma plasmons, with pi + sigma plasmons showing a typical quadratic dependence, whereas the pi plasmon exhibited a linear dispersion analogous to what was reported for graphene. Furthermore, a low energy excitation 0.7-1.6 eV was also observed which is attributed to direct nonvertical interband transitions along the Gamma F direction. DOI: 10.1103/PhysRevB.87.085126
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