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DOE OSTI · 3399019

Strong-field Driven Sub-cycle Band Structure Modulation and Dephasing Control

Walz, Francis [Purdue Univ., West Lafayette, IN (United States)]·Kumar, Shashank [Purdue Univ., West Lafayette, IN (United States)]·Sharifi Olounabadi, Amirali [Purdue Univ., West Lafayette, IN (United States)]·Zhong, Yuyan [Purdue Univ., West Lafayette, IN (United States)]·Zimmerman, Russell [Purdue Univ., West Lafayette, IN (United States)]·Pandey, Siddhant [Purdue Univ., West Lafayette, IN (United States)]·Liu, Eric [Purdue Univ., West Lafayette, IN (United States)]·Tan, Liang [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)]·Shivaram, Niranjan [Purdue Univ., West Lafayette, IN (United States); Purdue Univ., West Lafayette, IN (United States). Purdue Quantum Science and Engineering Institute]
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Abstract

In this work, we present measurements of ultrafast electric-field observables in magnesium oxide using a non-resonant nonlinear optical interaction. Using field observables, we show that strong laser fields modulate the band structure on sub-cycle timescales, thereby altering the material’s nonlinear optical response. We perform time-dependent perturbation theory calculations using a field-dependent dispersion relation and semiconductor Bloch equation calculations, both of which agree with experimental observations. Furthermore, we extract pulse decay times from the real-time signal electric field envelope and show sub-cycle control of dephasing times. Our work offers a new perspective on strong-field-driven electron dynamics in solids through electric-field observables. The demonstrated attosecond modulation of the nonlinear response could have important implications for quantum light generation and quantum spectroscopy using nonlinear optical processes.

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71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS74 ATOMIC AND MOLECULAR PHYSICSSub-cycle, nonlinear response, band structure, dephasing, ultrafast dynamics, strong-field, electric field observables

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Walz, Francis [Purdue Univ., West Lafayette, IN (United States)], Kumar, Shashank [Purdue Univ., West Lafayette, IN (United States)], Sharifi Olounabadi, Amirali [Purdue Univ., West Lafayette, IN (United States)], Zhong, Yuyan [Purdue Univ., West Lafayette, IN (United States)], Zimmerman, Russell [Purdue Univ., West Lafayette, IN (United States)], Pandey, Siddhant [Purdue Univ., West Lafayette, IN (United States)], Liu, Eric [Purdue Univ., West Lafayette, IN (United States)], Tan, Liang [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Shivaram, Niranjan [Purdue Univ., West Lafayette, IN (United States); Purdue Univ., West Lafayette, IN (United States). Purdue Quantum Science and Engineering Institute]. 2026-07-15. Strong-field Driven Sub-cycle Band Structure Modulation and Dephasing Control. https://doi.org/10.1126/sciadv.aeg3966

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