Introducing ferromagnetism into Dirac semimetal Cd<sub>3</sub>As<sub>2</sub> thin films
ORAL
Abstract
Breaking time-reversal symmetry in a Dirac semimetal (DSM) via magnetic doping is expected to create a Weyl semimetal. This motivates us to study the doping of the DSM Cd3As2 using transition metals. Here, we attempt to introduce Mn into Cd3As2 thin films grown by molecular beam epitaxy on GaAs (111)B substrates with a GaSb buffer layer. Atomic force microscopy and X-ray diffraction show that the films have good crystalline quality (root mean square surface roughness ~ 1.5 nm and full-width half maximum of rocking curves ~ 0.12°). However, cross-sectional scanning transmission electron microscopy indicates constraints on Mn incorporation and the formation of magnetically inhomogeneous films with a near-surface Mn-rich compound. SQUID magnetometry shows the presence of weak ferromagnetism. We use low-temperature transport measurements in patterned devices as a function of gate voltage, temperature, and magnetic field angle to understand Shubnikov-de Haas oscillations and quantum transport in this hybrid Dirac material.
*Supported by the Institute for Quantum Matter under DOE EFRC grant DE-SC0019331 and by the nCORE/SMART Center.
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Presenters
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Run Xiao
- Pennsylvania State University
- Department of Physics, The Pennsylvania State University
- Physics, Pennsylvania State University
- Department of Physics, Pennsylvania State University