Publication: Universal Signatures of Fractionalized Quantum Critical Points
All
 By Area
 By Year
Title 
Universal Signatures of Fractionalized Quantum Critical Points

Authors/Editors* 
Sergei V. Isakov, Roger G. Melko, Matthew B. Hastings

Where published* 
Nature 
How published* 
Journal 
Year* 
2012 
Volume 
335 
Number 

Pages 
193 
Publisher 

Keywords 

Link 

Abstract

Groundstates of certain materials can support exotic excitations with a charge that's a fraction of the fundamental electron charge. The condensation of these fractionalized particles has been predicted to drive novel quantum phase transitions, which haven't yet been observed in realistic systems. Through numerical and theoretical analysis of a physical model of interacting lattice bosons, we establish the existence of such an exotic critical point, called XY*. We measure a highly nonclassical critical exponent eta = 1.49(2), and construct a universal scaling function of winding number distributions that directly demonstrates the distinct topological sectors of an emergent Z_2 gauge field. The universal quantities used to establish this exotic transition can be used to detect other fractionalized quantum critical points in future model and material systems. 
Go to Condensed Matter Theory
Back to page 3 of list
