Large single crystal growth, transport property, and spectroscopic characterizations of three-dimensional Dirac semimetal Cd3As2

R Sankar; M Neupane; S-Y Xu; C J Butler; I Zeljkovic; I Panneer Muthuselvam; F-T Huang; S-T Guo; Sunil K Karna; M-W Chu; W L Lee; M-T Lin; R Jayavel; V Madhavan; M Z Hasan; F C Chou

doi:10.1038/srep12966

Large single crystal growth, transport property, and spectroscopic characterizations of three-dimensional Dirac semimetal Cd3As2

Sci Rep. 2015 Aug 14:5:12966. doi: 10.1038/srep12966.

Authors

R Sankar¹, M Neupane², S-Y Xu², C J Butler³, I Zeljkovic⁴, I Panneer Muthuselvam⁵, F-T Huang⁶, S-T Guo⁶, Sunil K Karna⁶, M-W Chu⁶, W L Lee⁵, M-T Lin⁷, R Jayavel⁸, V Madhavan⁹, M Z Hasan¹⁰, F C Chou¹¹

Affiliations

¹ 1] Institute of Physics, Academia Sinica, Taipei 11529, Taiwan [2] Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan.
² Joseph Henry Laboratory, Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
³ Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
⁴ Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
⁵ Institute of Physics, Academia Sinica, Taipei 11529, Taiwan.
⁶ Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan.
⁷ 1] Department of Physics, National Taiwan University, Taipei 10617, Taiwan [2] Institute of Atomic and molecular Sciences, Academia Sinica, Taipei 10617, Taiwan.
⁸ Anna University, Crystal Growth Centre, Chennai 600025, India.
⁹ Department of Physics and FrederickSeitz Materials Research Laboratory, University of Illinois Urbana-Champaign, 61801, USA.
¹⁰ 1] Joseph Henry Laboratory, Department of Physics, Princeton University, Princeton, New Jersey 08544, USA [2] Princeton Center for Complex Materials, Princeton University, Princeton, New Jersey 08544, USA.
¹¹ 1] Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan [2] National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan [3] Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, Taipei 10622, Taiwan.

Abstract

The three dimensional (3D) Dirac semimetal is a new quantum state of matter that has attracted much attention recently in physics and material science. Here, we report on the growth of large plate-like single crystals of Cd3As2 in two major orientations by a self-selecting vapor growth (SSVG) method, and the optimum growth conditions have been experimentally determined. The crystalline imperfections and electrical properties of the crystals were examined with transmission electron microscopy (TEM), scanning tunneling microscopy (STM), and transport property measurements. This SSVG method makes it possible to control the as-grown crystal compositions with excess Cd or As leading to mobilities near 5-10(5) cm(2)V(-1)s(-1). Zn-doping can effectively reduce the carrier density to reach the maximum residual resistivity ratio (RRRρ300K/ρ5K) of 7.6. A vacuum-cleaved single crystal has been investigated using angle-resolved photoemission spectroscopy (ARPES) to reveal a single Dirac cone near the center of the surface Brillouin zone with a binding energy of approximately 200 meV.

Publication types

Research Support, Non-U.S. Gov't