Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 73: Low-Dimensional Systems: Topological Order

TT 73.8: Vortrag

Donnerstag, 10. März 2016, 17:15–17:30, H19

Temperature induced crossover in the collision-dominated Dirac semimetal Cd₃As₂ — Azat Sharafeev¹, Vladimir Gnezdilov^1,2, •Peter Lemmens¹, Raman Sankar³, and Fangcheng Chou³ — ¹IPKM, TU-BS, Braunschweig — ²ILTPE NAS, Ukraine — ³CCMS, National Taiwan Univ., Taipei, Taiwan

The 3D topological Dirac semimetal Cd₃As₂ was studied in a wide range of temperatures and excitation energies using Raman spectroscopy. The temperature evolution of the phononic and the quasielastic electronic scattering is discussed in terms of a collision-dominated regime with pronounced electronic energy density fluctuations. A crossover is observed in the intensity of the signals attributed to a collision-dominated phonon regime.

Work supported by RTG-DFG 1952/1, Metrology for Complex Nanosystems and the Laboratory for Emerging Nanometrology, TU Braunschweig.