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First-order phase transition in easy-plane quantum antiferromagnets.
S Kragset1, E Smørgrav, J Hove
1Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway.
Physical Review Letters
|February 7, 2007
Summary
Quantum phase transitions in Mott insulators challenge existing theories. Our study on 2D spin 1/2 antiferromagnets reveals a first-order transition, contradicting the deconfined quantum criticality conjecture.
Area of Science:
- Condensed Matter Physics
- Quantum Magnetism
Background:
- Quantum phase transitions in Mott insulators often defy conventional Landau-Ginzburg-Wilson theory.
- The deconfined quantum criticality scenario offers a new framework for understanding these transitions.
Purpose of the Study:
- To investigate the nature of quantum phase transitions in two-dimensional spin 1/2 quantum antiferromagnets in the easy-plane limit.
- To test the conjecture that a second-order phase transition occurs in this system.
Main Methods:
- Large-scale Monte Carlo simulations were employed.
- An effective gauge theory incorporating a Berry-phase term was used to project out the S=1/2 sector.
Main Results:
- The simulations indicated a first-order phase transition.
- This finding contradicts the proposed deconfined quantum criticality scenario for this specific system.
Conclusions:
- The study challenges the applicability of the deconfined quantum criticality scenario in this context.
- Understanding Mott insulator phase structure requires further theoretical and computational investigation.
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