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Characterization of Few-Layer 1T′ MoTe2 by Polarization-Resolved Second Harmonic Generation and Raman Scattering
Open accessAbstract
We study the crystal symmetry of few-layer 1T′ MoTe 2 using the polarization dependence of the second harmonic generation (SHG) and Raman scattering. Bulk 1T′ MoTe 2 is known to be inversion symmetric; however, we find that the inversion symmetry is broken for finite crystals with even numbers of layers, resulting in strong SHG comparable to other transition-metal dichalcogenides. Group theory analysis of the polarization dependence of the Raman signals allows for the definitive assignment of all the Raman modes in 1T′ MoTe 2 and clears up a discrepancy in the literature. The Raman results were also compared with density functional theory simulations and are in excellent agreement with the layer-dependent variations of the Raman modes. The experimental measurements also determine the relationship between the crystal axes and the polarization dependence of the SHG and Raman scattering, which now allows the anisotropy of polarized SHG or Raman signal to independently determine the crystal orientation.
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Cites
Photonics and optoelectronics of 2D semiconductor transition metal dichalcogenides
Mak, K. F., & Shan, J. (2016) · Nature Photonics · doi:10.1038/nphoton.2015.282 · Cited by 3,819
Soluyanov, A. A., Gresch, D., Wang, Z., Wu, Q., Troyer, M., Dai, X., & Bernevig, B. A. (2015) · Nature · doi:10.1038/nature15768 · Cited by 2,526
Quantum spin Hall effect in two-dimensional transition metal dichalcogenides
Qian, X., Liu, J., Fu, L., & Li, J. (2014) · Science · doi:10.1126/science.1256815 · Cited by 2,053
Large, non-saturating magnetoresistance in WTe2
Ali, M. N., Xiong, J., Flynn, S., Tao, J., Gibson, Q. D., Schoop, L. M., Liang, T., Haldolaarachchige, N., Hirschberger, M., Ong, N. P., et al. (2014) · Nature · doi:10.1038/nature13763 · Cited by 1,673
Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe2
Deng, K., Wan, G., Deng, P., Zhang, K., Ding, S., Wang, E., Yan, M., Huang, H., Zhang, H., Xu, Z., et al. (2016) · Nature Physics · doi:10.1038/nphys3871 · Cited by 794
Signature of type-II Weyl semimetal phase in MoTe2
Jiang, J., Liu, Z. K., Sun, Y., Yang, H. F., Rajamathi, C. R., Qi, Y. P., Yang, L. X., Chen, C., Peng, H., Hwang, C.-C., et al. (2017) · Nature Communications · doi:10.1038/ncomms13973 · Cited by 452
Cited by
Emerging in‐plane anisotropic two‐dimensional materials
Li, L., Han, W., Pi, L., Niu, P., Han, J., Wang, C., Su, B., Li, H., Xiong, J., Bando, Y., et al. (2019) · InfoMat · doi:10.1002/inf2.12005 · Cited by 382
Metadata
- Authors
- Beams, R., Cançado, L. G., Krylyuk, S., Kalish, I., Kalanyan, B., Singh, A. K., Choudhary, K., Bruma, A., Vora, P. M., Tavazza, F., Davydov, A. V., & Stranick, S. J.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2016-10-13
- Volume
- 10
- Issue
- 10
- Pages
- 9626-9636
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2527788794
- Cited by
- 204
- References
- 6
- FWCI
- 7.71
- Type
- journal article
- Language
- en
- Open access
- green
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- Beams, R., Cançado, L. G., Krylyuk, S., Kalish, I., Kalanyan, B., Singh, A. K., Choudhary, K., Bruma, A., Vora, P. M., Tavazza, F., Davydov, A. V., & Stranick, S. J. (2016). Characterization of Few-Layer 1T′ MoTe2 by Polarization-Resolved Second Harmonic Generation and Raman Scattering. ACS Nano. https://doi.org/10.1021/acsnano.6b05127
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