(Left, above) Schematic diagram describing the process of the Au implantation into the Dirac semimetal (DSM) Bi0.96Sb0.04. (Left, below) Positive longitudinal magnetic resistance (LMR) is observed in the crystal without ion implantation, but negative LMR behavior becomes apparent for ϕG ≥ 3.2 × 1016 Au cm−2 (≡ ϕC, critical implant fluence), and reaches a maximum for ϕG = 8.0 × 1016 Au cm−2. (Middle) Quantum oscillation parameters for the β Fermi pockets showing abrupt changes near ϕC, typical of phase transition. No such behavior is observed for the α Fermi pockets. (Right) A drastic change in the Raman spectra is observed for ϕG ≥ ϕC. In particular, a new peak appears at 85.7 cm−1, between the well-known Raman modes, suggesting that the inversion symmetry breaking in the crystal occurred for ϕG ≥ ϕC, resulting in the transition of the DSM to a Weyl semimetal.
- Won Jun Lee
- Yusuff Adeyemi Salawu
- Suk-Ho Choi
