منابع مشابه
Asymmetry in shape causing absolute negative mobility.
We propose a simple classical concept of nanodevices working in an absolute negative mobility (ANM) regime: the minimal spatial asymmetry required for ANM to occur is embedded in the geometry of the transported particle, rather than in the channel design. This allows for a tremendous simplification of device engineering, thus paving the way toward practical implementations of ANM. Operating con...
متن کاملBrownian motion exhibiting absolute negative mobility.
We consider a single Brownian particle in a spatially symmetric, periodic system far from thermal equilibrium. This setup can be readily realized experimentally. Upon application of an external static force F, the average particle velocity is negative for F>0 and positive for F<0 (absolute negative mobility).
متن کاملInconsistent thermostatistics and negative absolute temperatures
A considerable body of experimental and theoretical work claims the existence of negative absolute temperatures in spin systems and ultra-cold quantum gases. Here, we clarify that such findings can be attributed to the use of a popular yet inconsistent entropy definition, which violates fundamental thermodynamic relations and fails to produce sensible results for simple analytically tractable c...
متن کاملThe Physics of Negative Absolute Temperatures
Negative absolute temperatures were introduced into experimental physics by Purcell and Pound, who successfully applied this concept to nuclear spins; nevertheless the concept has proved controversial : a recent article aroused considerable interest by its claim, based on a classical entropy formula (the ‘volume entropy’) due to Gibbs, that negative temperatures violated basic principles of sta...
متن کاملBinary Liquids under Absolute Negative Pressure
We would like to give a brief review concerning liquid-liquid equilibrium in binary liquid mixtures under absolute negative pressure. Although negative pressure states are metastable ones, they can be maintained long enough to make phase equilibrium measurements. Several phenomena concerning liquid-liquid equilibrium can be seen only – or can be seen better – under negative pressure; these are ...
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ژورنال
عنوان ژورنال: Physik Journal
سال: 1957
ISSN: 0031-9279
DOI: 10.1002/phbl.19570130902