Violation of the fluctuation-dissipation theorem in confined driven colloids
Violation of the fluctuation-dissipation theorem in confined driven colloids
复制标题
约束驱动胶体中涨落耗散定理的违反
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
D. Leporini
中科院分区：
文献类型：
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作者：
R. Mauri;D. Leporini
分析模型描述了一个胶体粒子限制在一个谐波井，例如提供了一个光阱，并通过剪切流驱动。违反静态和动态波动耗散定理（FDT）是清楚地看到，从而澄清这种FDT违反和详细平衡的故障之间的联系。简单的剪切和泰勒-库埃特速度场进行了详细研究，松动约束增强FDT违规。此外，违反FDT，但不能量均分的情况下。对于所研究的情况下，一个有效的温度是通过静态FDT定义的，这似乎是更物理上的声音比一个通过时间依赖FDT定义。限制剪切胶体粒子的光镊产生相当大的FDT违反。
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 clarifying the 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 violating FDT 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.