Physics

Possible permanent Dirac- to Weyl-semimetal phase transition by ion implantation

W. J. Lee, Y. A. Salawu, et al.

This groundbreaking research led by Won Jun Lee and colleagues unveils the first potential permanent transition from a Dirac to a Weyl-semimetal phase in a single topological semimetal via ion implantation. The team discovered this transformative effect by implanting nonmagnetic Au ions, as evidenced by dramatic changes in Raman spectra and magnetoresistance measurements, highlighting a unique method to achieve this phase transition.

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Abstract

This paper reports the first possible permanent Dirac- to Weyl-semimetal phase transition in a single TSM (topological semimetal) by ion implantation. Inversion-symmetry breaking, induced by implanting nonmagnetic Au ions into a Bi0.96Sb0.04 Dirac semimetal (DSM) at fluences ≥ 3.2 × 10¹⁶ Au cm⁻², resulted in this transition. This was evidenced by changes in Raman spectra and quantum-oscillation parameters from magnetoresistance measurements. Negative magnetoresistance (NMR), indicating a chiral anomaly in Weyl fermions, further supports the transition. In contrast, implantation with magnetic Mn ions showed no such effect. This demonstrates a simple method for achieving a permanent DSM-to-WSM phase transition using nonmagnetic elements.

Publisher

NPG Asia Materials

Published On

May 12, 2022

Authors

Won Jun Lee, Yusuff Adeyemi Salawu, Heon-Jung Kim, Chan Wook Jang, Sung Kim, Thomas Ratcliff, Robert G. Elliman, Zengji Yue, Xiaolin Wang, Sang-Eon Lee, Myung-Hwa Jung, Jong-Soo Rhyee, Suk-Ho Choi

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