APS Logo

Exploring broken time-reversal symmetry in Cd<sub>3</sub>As<sub>2</sub>/(Ga,Mn)Sb Dirac semimetal/ferromagnetic semiconductor heterostructures

ORAL

Abstract

Cd3As2 has attracted attention as a canonical Dirac semimetal. We aim to break time reversal symmetry (TRS) in Cd3As2 by interfacing with a ferromagnetic semiconductor (Ga,Mn)Sb.We have grown epitaxial Cd3As2 /(Ga,Mn)Sb bilayers by molecular beam epitaxy on GaSb(111) buffer layer using GaAs(111)B substrates.High-resolution XRD shows good crystalline quality of Cd3As2 layers with full width half maximum of rocking curves ~0.11°.AFM shows smooth surface of Cd3As2 with root mean square roughness ~1.2 nm.SQUID magnetometry reveals weak ferromagnetism in (Ga,Mn)Sb films,while low temperature magnetoresistance (MR) data show that they are highly resistive for the Mn composition used.We report the temperature dependent magneto-transport properties in Cd3As2/(Ga,Mn)Sb bilayers and investigate the magnetic proximity effect at the interface.The observation of hysteretic MR and a planar Hall effect suggest proximity-induced ferromagnetic ordering in Cd3As2.We have performed polarised neutron reflectivity measurements to get an indication of the proximity effect at the interface.We are exploring interfacing Cd3As2 with other ferromagnetic insulators in order to find an efficient material for breaking TRS in Cd3As2.

–

Presenters

  • Arpita Mitra

    Pennsylvania State University

Authors

  • Arpita Mitra

    Pennsylvania State University

  • Run Xiao

    Pennsylvania State University, Physics, Pennsylvania State University

  • Alexander Grutter

    National Institute of Standards and Technology, Center for Neutron Research, National Institute of Standards and Technology, NIST Center for Neutron Research, NIST, NIST Gaithersburg

  • Julie Borchers

    National Institute of Standards and Technology, NIST Center for Neutron Research, National Institute of Standards and Technology, NIST, Center for Neutron Research, National Institute of Standards and Technology, NCNR, National Institute of Standards and Technology

  • Brian Kirby

    National Institute of Standards and Technology, National Institute of Standards and Technology, Gaithersburg, MD, Center for Neutron Research, National Institute of Standards and Technology

  • Patrick Quarterman

    National Institute of Standards and Technology, Center for Neutron Research, National Institute of Standards and Technology, NIST Center for Neutron Research, NIST

  • NITIN SAMARTH

    Pennsylvania State University, Department of Physics, Pennsylvania State University