Large transverse Hall-like signal in topological Dirac semimetal Cd3As2

Abstract

Cadmium arsenide ($\mathrm{C}{\mathrm{d}}_3\mathrm{A}{\mathrm{s}}_2$) is known for its inverted band structure and ultra-high electron mobility. It has been theoretically predicted and also confirmed by ARPES experiments to exhibit a 3D Dirac semimetal phase containing degenerate Weyl nodes. From magneto-transport measurements in high quality single crystals of $\mathrm{C}{\mathrm{d}}_3\mathrm{A}{\mathrm{s}}_2$, a small effective mass $m^{\ast }\approx$ 0.05 $m_e$ is determined from the Shubnikov-de Haas (SdH) oscillations. In certain field orientations, we find a splitting of the SdH oscillation frequency in the FFT spectrum suggesting a possible lifting of the double degeneracy in accord with the helical spin texture at outer and inner Fermi surfaces with opposite chirality predicted by our \textit{ab initio} calculations. Strikingly, a large antisymmetric magnetoresistance with respect to the applied magnetic fields is uncovered over a wide temperature range in needle crystal of $\mathrm{C}{\mathrm{d}}_3\mathrm{A}{\mathrm{s}}_2$ with its long axis along [112] crystal direction. It reveals a possible contribution of intrinsic anomalous velocity term in the transport equation resulting from a unique 3D Rashba-like spin splitted bands that can be obtained from band calculations with the inclusion of Cd antisite defects.

arXiv comment17 pages, 5 figures

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• Electron-phonon coupling, superconductivity and nontrivial band topology in NbN polytypes
• From Dirac semimetals to topological phases in three dimensions: a coupled wire construction
• Massive fermions with low mobility in antiferromagnet orthorhombic CuMnAs single crystals
• Coupled Wire Models of Interacting Dirac Nodal Superconductors
• Spin-lattice relaxation phenomena in the magnetic state of a suggested Weyl semimetal CeAlGe
• Observation of surface superstructure induced by systematic vacancies in the topological Dirac semimetal Cd${}_3$As${}_2$