{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"f8bc5f425c11fb1ab7c170fece174a9d66b492715bf65bb18146ecee2d9c046d","created":"2026-10-03T07:17:53Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["183e79026db85b21406f5df4c36a6c7d3635be9ca1f4246146875d83810df5d8","5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"17b6ee1dedf382800617ca2aad46c4a0fd55759ddecee846340459312a863c90","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"amo.attosecond-electron-dynamics.hhg-dephasing-time","kind":"phenomenon","literature_status":"contested","n":"1","parents":[{"note":"","parent_revision":"183e79026db85b21406f5df4c36a6c7d3635be9ca1f4246146875d83810df5d8","relation":"special_case"}],"plain":"Computer models of harmonic light from crystals only match experiments if the electrons lose their quantum phase within about a femtosecond. That is much faster than measured loss of phase in the same materials, and the cause is not agreed.","posed_since":"","precise":"Semiconductor Bloch equation fits to solid HHG spectra require an interband dephasing time $T_2$ of roughly 1 to a few fs to produce clean harmonic peaks, while carrier dephasing measured by other ultrafast methods in the same crystals is much longer. Question: which physical process (spatial averaging over the focal intensity distribution, propagation, electron-electron scattering at high excitation, real-space trajectory interference) produces the apparent short $T_2$. An answer is a calculation with $T_2$ set by independent data that reproduces measured spectra, or the identification of the process that mimics short dephasing.","problem_ref":null,"references":"","settled_by":"A simulation with no fitted dephasing, including macroscopic propagation and focal averaging, that reproduces measured harmonic spectra and their contrast.","status_note":"Kilen et al. (Physical Review Letters 2020) showed that propagation effects can mimic fs dephasing; whether propagation, focal averaging or real-space trajectory interference accounts for the short $T_2$ in general is not agreed.","title":"Why solid-state harmonic models need femtosecond dephasing 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