{"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 times","topic_ref":"0df42c165abe2c701f655081b1ae2c457e3434bf87099b8b980410a52274fe98"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"c80ac135a11fe45f9aa121f312add180c97a51a81f0a600de9ffa9a3fab6628b","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"fe37e02cfff3c03ae2264d68789fbb1ec93ce383633592eeea936e35ed8667e7","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"lH3sULXM8BoMpmAvDmFUtBuL9hxB7mkgJMZRX8JRtIvEvDcRamfxY7T5IPFdmfzvoHbZzPbBgi9GuxPBEIMmBw"},"schema":"pubphys.envelope/1"},"record_hash":"c80ac135a11fe45f9aa121f312add180c97a51a81f0a600de9ffa9a3fab6628b","leaf_index":371}