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We consider a Coulomb drag geometry with two coplanar TIs and short-ranged spin-flip inter-edge scattering. Current injected into one edge loop induces circulation in the second, which floats without leads. In the low-temperature ($T \\rightarrow 0$) perfect drag regime, the conductance is $(e^2/h)(2 K + 1)/(K + 1)$. At higher $T$ we predict a conductivity $\\sim T^{-4K+3}$. The conductivity for a sin"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1508.04433","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2015-08-18T20:09:21Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"409fd124e974e16eb655d45e65627d85daf619e181c1573e4b18f3eb6d50fa27","abstract_canon_sha256":"34d030e79a5d5270614d7a93dd8ec5ef33e8b667cf03b5c28abb0affe8903679"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:28:33.974798Z","signature_b64":"+x7Yq2/Jorre6BwmGANjJPT7NEGBPra8hg6YIcNvf0tC8d/IkyanwodP99n9PiNI9gOH+nodj2XNJDItNt/jBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"979389c97034e56aacfa9915af698fefd7808980108eb8867baaf4de3cca7847","last_reissued_at":"2026-05-18T01:28:33.974204Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:28:33.974204Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Helical Quantum Edge Gears in 2D Topological Insulators","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.str-el"],"primary_cat":"cond-mat.mes-hall","authors_text":"Alex Levchenko, Matthew S. 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