Large transverse Hall-like signal in topological Dirac semimetal Cd3As2

Shih Ting Guo, R. Sankar, Yung Yu Chien, Tay Rong Chang, Horng Tay Jeng, Guang Yu Guo, F. C. Chou, Wei Li Lee

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Cadmium arsenide (Cd3As2) 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 Cd3As2, a small effective mass m∗ ≈ 0.05 me 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 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 Cd3As2 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.

Original languageEnglish
Article number27487
JournalScientific reports
Volume6
DOIs
Publication statusPublished - 2016 Jun 6

All Science Journal Classification (ASJC) codes

  • General

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