Europhys. Lett.
Volume 70, Number 5, June 2005
Page(s) 635 - 641
Section Condensed matter: structural, mechanical and thermal properties
Published online 29 April 2005
Europhys. Lett., 70 (5), pp. 635-641 (2005)
DOI: 10.1209/epl/i2005-10025-3

Probing disordered substrates by imaging the adsorbate in its fluid phase

A. Sengupta1, S. Sengupta1 and G. I. Menon2

1  S. N. Bose National Centre for Basic Sciences, Block JD, Sector III Salt Lake, Kolkata 700 098, India
2  The Institute of Mathematical Sciences, CIT Campus Taramani, Chennai 600 113, India

received 4 March 2005; accepted in final form 4 April 2005
published online 29 April 2005

Several recent imaging experiments access the equilibrium density profiles of a monolayer of interacting particles confined to a two-dimensional substrate. When these particles are in a fluid phase, we show that such data yields precise information regarding substrate disorder as reflected in one-point functions and two-point correlations of the fluid. Using Monte Carlo simulations and replica generalizations of liquid state theories, we extract unusual two-point correlations of time-averaged density inhomogeneities induced by disorder. Correlation functions such as these have not hitherto been measured but should be experimentally accessible.

68.43.De - Statistical mechanics of adsorbates.
61.20.-p - Structure of liquids.
79.60.Ht - Disordered structures.

© EDP Sciences 2005