Analytical models describing a colloidal particle conﬁned in a harmonic well, e.g. provided by an optical trap, and driven by shear ﬂows are presented. Violation of both static and dynamic ﬂuctuation-dissipation theorem (FDT) is clearly seen, thus clarifyingthe connection between such FDT violation and the breakdown of the detailed balance. The simple shear and Taylor-Couette velocity ﬁelds are studied in detail, showing that loosening conﬁnement enhances FDT violations. In addition, cases violatingFDT but not energy equipartition are presented. For the cases under study, an eﬀective temperature is deﬁned via the static FDT, which appears to be more physically sound than the one deﬁned via the time-dependent FDT. Conﬁning sheared colloidal particles by optical tweezers yields considerable FDT violation.
|Autori:||MAURI R; LEPORINI D|
|Titolo:||Violation of the Fluctuation-Dissipation Theorem in Confined Driven Colloids|
|Anno del prodotto:||2006|
|Digital Object Identifier (DOI):||10.1209/epl/i2006-10386-y|
|Appare nelle tipologie:||1.1 Articolo in rivista|