First- and second-order Raman scattering from MoTe2 single crystal

Simone Caramazza, Arianna Collina, Elena Stellino, Francesca Ripanti, Paolo Dore () and Paolo Postorino
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Simone Caramazza: Physics Department, Sapienza University of Rome
Arianna Collina: Physics Department, Sapienza University of Rome
Elena Stellino: Physics Department, Sapienza University of Rome
Francesca Ripanti: Physics Department, Sapienza University of Rome
Paolo Dore: CNR-SPIN and Physics Department, Sapienza University of Rome
Paolo Postorino: CNR-IOM and Physics Department, Sapienza University of Rome

The European Physical Journal B: Condensed Matter and Complex Systems, 2018, vol. 91, issue 2, 1-7

Abstract: Abstract We report on Raman experiments performed on a MoTe2 single crystal. The system belongs to the wide family of transition metal dichalcogenides which includes several of the most interesting two-dimensional materials for both basic and applied physics. Measurements were performed in the standard basal plane configuration, by placing the ab plane of the crystal perpendicular to the wave vector k i of the incident beam to explore the in-plane vibrational modes, and in the edge plane configuration with k i perpendicular to the crystal c axis, thus mainly exciting out-of-plane modes. For both configurations we performed a polarization-dependent study of the first-order Raman components and detailed computation of the corresponding selection rules. We were thus able to provide a complete assignment of the observed first-order Raman peaks, in agreement with previous literature results. A thorough analysis of the second-order Raman bands, as observed in both basal and edge plane configurations, provides new information and allows a precise assignment of these spectral structures. In particular, we have observed and assigned Raman active modes of the M point of the Brillouin zone previously predicted by ab initio calculations but never previously measured.

Date: 2018
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DOI: 10.1140/epjb/e2017-80399-5

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