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Raman Spectroscopy of Few-Quintuple Layer Topological Insulator Bi2Se3 Nanoplatelets
Abstract
We report on Raman spectroscopy of few quintuple layer topological insulator bismuth selenide (Bi2Se3) nanoplatelets (NPs), synthesized by a polyol method. The as-grown NPs exhibit excellent crystalline quality, hexagonal or truncated trigonal morphology, and uniformly flat surfaces down to a few quintuple layers. Both Stokes and anti-Stokes Raman spectroscopy for the first time resolve all four optical phonon modes from individual NPs down to 4 nm, where the out-of-plane vibrational A(1g)(1) mode shows a few wavenumbers red shift as the thickness decreases below ~15 nm. This thickness-dependent red shift is tentatively explained by a phonon softening due to the decreasing of the effective restoring force arising from a decrease of the van der Waals forces between adjacent layers. Quantitatively, we found that the 2D phonon confinement model proposed by Faucet and Campbell cannot explain the red shift values and the line shape of the A(1g)(1) mode, which can be described better by a Breit–Wigner–Fano resonance line shape. Considerable broadening (~17 cm(–1) for six quintuple layers) especially for the in-plane vibrational mode E(g)(2) is identified, suggesting that the layer-to-layer stacking affects the intralayer bonding. Therefore, a significant reduction in the phonon lifetime of the in-plane vibrational modes is probably due to an enhanced electron–phonon coupling in the few quintuple layer regime.
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Metadata
- Authors
- Zhang, J., Peng, Z., Soni, A., Zhao, Y., Xiong, Y., Peng, B., Wang, J., Dresselhaus, M. S., & Xiong, Q.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-05-23
- Volume
- 11
- Issue
- 6
- Pages
- 2407-2414
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2052019383
- Cited by
- 511
- References
- 43
- FWCI
- 13.79
- Type
- journal article
- Language
- en
- Open access
- closed
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