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6 papers · 1 filter
Diffusion of Chiral Janus Particles in a Sinusoidal Channel
Xue Ao, Pulak Kumar Ghosh, Yunyun Li +3
We investigate the transport diffusivity of artificial microswimmers, a.k.a. Janus particles, moving in a sinusoidal channel in the absence of external biases. Their diffusion cons…
Geometric origin of negative Casimir entropies: A scattering-channel analysis
Gert-Ludwig Ingold, Stefan Umrath, Michael Hartmann +4
Negative values of the Casimir entropy occur quite frequently at low temperatures in arrangements of metallic objects. The physical reason lies either in the dissipative nature of…
Active Brownian motion in a narrow channel
Xue Ao, Pulak Kumar Ghosh, Yunyun Li +3
We review recent advances in rectification control of artificial microswimmers, also known as Janus particles, diffusing along narrow, periodically corrugated channels. The swimmer…
ESR evidence for partial melting of the orbital order in LaMnO below the Jahn-Teller transition
S. Schaile, H. -A. Krug von Nidda, J. Deisenhofer +3
We report on high-temperature electron spin resonance studies of a detwinned LaMnO single crystal across the Jahn-Teller transition at = 750 K. The anisotropy of t…
Giant enhancement of hydrodynamically enforced entropic trapping in thin channels
S. Martens, A. V. Straube, G. Schmid +2
Using our generalized Fick-Jacobs approach [Martens et al., PRL 110, 010601 (2013); Martens et al., Eur. Phys. J. Spec. Topics 222, 2453-2463 (2013)] and extensive Brownian dynamic…
Refinements of the Chern-Dold Character: Cocycle Additions in Differential Cohomology
Markus Upmeier
The Chern-Dold character of a cohomology theory E is a canonical transformation to ordinary cohomology. A spectrum representing E gives homotopy theoretic cocycle…