{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"622561a44828ac187a6972270f5403faa836e3cf1782507986f84793fadb1421","created":"2026-10-03T07:17:51Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"b092a1d5175cbb140a991222b28d5ec625ba34483a1d9be56806fe2242d70cf7","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"cm.mit-2d-electrons","field":"cm","n":"1","review_cite":"S. V. Kravchenko and M. P. Sarachik, Metal-insulator transition in two-dimensional electron systems, Reports on Progress in Physics, 2004","review_link":"https://doi.org/10.1088/0034-4885/67/1/R01","review_verified":"true","summary":"Theory of non-interacting electrons predicts that any disorder turns a thin sheet of electrons into an insulator at absolute zero. Yet clean, dilute electron sheets in silicon and gallium arsenide devices act like metals whose resistance falls on cooling, and they become insulators only below a critical electron density.","title":"Metal-insulator transition in two-dimensional electron systems","topic_ref":null,"why":"It tests whether strong electron repulsion can stabilize a two-dimensional metal against disorder, which the scaling theory of localization for free electrons forbids."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"ee362e23da2342f193662a6035550f6f3c5b8e03f6ea05d358e6812125e46d7b","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"535921a251f0c798b1b281aa4dd726028783f5c3d887d4ab6f3afb5ac46a0d9f","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"hAEcyhINcbAkuzBjHezbaAEI2zU0MS6Nd07fH3dj7wuisdLq8mT8LUcW_D9ECx7D5zUqy-8HM6QlkppLtCqRDA"},"schema":"pubphys.envelope/1"},"record_hash":"ee362e23da2342f193662a6035550f6f3c5b8e03f6ea05d358e6812125e46d7b","leaf_index":155}