Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 18: Correlated Electrons: Spin Systems and Itinerant Magnets – Frustrated Magnets 2 (jointly with MA)

TT 18.7: Vortrag

Montag, 16. März 2015, 16:30–16:45, H 3005

Monte-Carlo Study of Polarization Plateaux in Hexagonal Water Ice — •Matthias Gohlke, Frank Pollmann, and Roderich Moessner — Max Planck Institute for the Physics of Complex Systems, Dresden, Germany

We study the hexagonal phase Ih of water ice in an external electric field at low temperatures using a Worm Monte Carlo algorithm. We observe polarization plateaux when the field is aligned along the [001] and [1-10] directions. In each case, one plateau occurs at intermediate polarization with finite entropy. The remaining degrees of freedom can be mapped to dimer models on the honeycomb and the square lattice, respectively. Upon slightly tilting the external field, we observe a Kasteleyn transition to a plateau with saturated polarization and vanishing entropy. This transition is checked analytically using the Pfaffian method and compared to the Monte Carlo results.