Abstract
We proposed a mechanism to generate giant anisotropic second harmonic nonlinear response via double resonance effect, achieved through band nesting via electronic band-structure engineering. The ideal band setup would be a triplet of nested bands separated by the fundamental resonance energy h ω. We demonstrate theoretically that the proposed phenomenon can be realized in bilayer SnS by band tuning with perpendicular electrical bias, which maximizes the second harmonic susceptibility by several orders of magnitude. Moreover, the tunability of the polarization anisotropy can be useful for realizing novel polarization-sensitive devices.
Original language | English (US) |
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Article number | 115409 |
Journal | Physical Review B |
Volume | 107 |
Issue number | 11 |
DOIs | |
State | Published - Mar 15 2023 |
Externally published | Yes |
Bibliographical note
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