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Condensed Matter > Materials Science
Title: Roles of band gap and Kane electronic dispersion in the THz-frequency nonlinear optical response in HgCdTe
(Submitted on 16 Apr 2024 (v1), last revised 17 Apr 2024 (this version, v2))
Abstract: Materials with linear electronic dispersion often feature high carrier mobilities and unusually strong nonlinear optical interactions. In this work, we investigate the THz nonlinear dynamics of one such material, HgCdTe, with an electronic band dispersion heavily dependent on both temperature and stoichiometry. We show how the band gap, carrier concentration and band shape together determine the nonlinear response of the system. At low temperatures, carrier generation from Zener tunneling dominates the nonlinear response with a reduction in the overall transmission. At room temperature, quasi-ballistic electronic dynamics drive the largest observed nonlinear optical interactions, leading to a transmission increase. Our results demonstrate the sensitivity of these nonlinear optical properties of narrow-gap materials to small changes in the electronic dispersion and carrier concentration.
Submission history
From: Davide Soranzio [view email][v1] Tue, 16 Apr 2024 14:06:27 GMT (12405kb,D)
[v2] Wed, 17 Apr 2024 22:47:47 GMT (12409kb,D)
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