TY - RPRT TI - Strong ultrafast nonlinear optical response from megaelectronvolt electrons in semiconductors AU - Jeong, D. [Stanford Univ., CA (United States)] (ORCID:0000000211390118) AU - Hopper, T. R. [Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)] (ORCID:0000000150841914) AU - Kim, Y. [Stanford Univ., CA (United States)] AU - Shen, X. [SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)] (ORCID:000000026844608X) AU - Kramer, P. L. [SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)] AU - Hoffmann, M. C. [SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)] (ORCID:0000000235969853) AU - Coffee, R. [SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)] (ORCID:0000000226198823) AU - Fejer, M. [Stanford Univ., CA (United States)] (ORCID:0000000255121905) AU - Lindenberg, A. M. [Stanford Univ., CA (United States)] (ORCID:0000000332337161) AU - Levin, C. S. [Stanford Univ., CA (United States)] PY - 2026 DO - 10.1038/s41566-026-01894-3 UR - https://www.osti.gov/biblio/3355801 ID - 3355801 ER -