Chaudhuri Pinaki, Das Chinmay, Dasgupta Chandan, Krishnamurthy H R, Sood A K
Department of Physics, Indian Institute of Science, Bangalore, India.
Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Dec;72(6 Pt 1):061404. doi: 10.1103/PhysRevE.72.061404. Epub 2005 Dec 20.
The effects of an externally applied one-dimensional periodic potential on the freezing and melting behavior of two-dimensional systems of colloidal particles with a short-range attractive interaction are studied using Monte Carlo simulations. In such systems, incommensuration results when the periodicity of the external potential does not match the length scale at which the minimum of the attractive potential occurs. To study the effects of this incommensuration, we consider two different models for the system. Our simulations for both these models show the phenomenon of reentrant freezing as the strength of the periodic potential is varied. Our simulations also show that different exotic phases can form when the strength of the periodic potential is high, depending on the length scale at which the minimum of the attractive pair potential occurs.
利用蒙特卡罗模拟研究了外部施加的一维周期性势对具有短程吸引相互作用的二维胶体颗粒系统冻结和熔化行为的影响。在这样的系统中，当外部势的周期性与吸引势最小值出现的长度尺度不匹配时，就会产生失配。为了研究这种失配的影响，我们考虑了该系统的两种不同模型。我们对这两种模型的模拟都表明，随着周期性势强度的变化，会出现再入冻结现象。我们的模拟还表明，当周期性势强度较高时，根据吸引对势最小值出现的长度尺度不同，可以形成不同的奇异相。
