This study demonstrates surface-specific optical nonlinearity in Dirac semimetal, suggesting a link to topological surface states.
We report anomalously strong, surface-specific, purely out-of-plane optical nonlinearity in PdTe 2 Dirac semimetal through polarization-dependent heterodyne-interferometric rotational-anisotropic second-harmonic generation. This strong nonlinearity is correlated to the topological surface states via surface and orbital-projected band calculations.
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Faizanuddin et al. (2025) studied this question.
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