Abstract
Recently it was argued that quantum phase transitions can be radically different from classical phase transitions with, as a highlight, the "deconfined critical points" exhibiting fractionalization of quantum numbers due to Berry phase effects. Such transitions are supposed to occur in frustrated ("J(1)-J(2)") quantum magnets. We have developed a novel renormalization approach for such systems which is fully respecting the underlying lattice structure. According to our findings, another profound phenomenon is around the corner: a fluctuation-induced (order-out-of-disorder) first-order transition. This has to occur for large spin and we conjecture that it is responsible for the weakly first-order behavior recently observed in numerical simulations for frustrated S = 1/2 systems.
Original language | English |
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Pages (from-to) | 896-902 |
Number of pages | 7 |
Journal | EPL |
Volume | 74 |
Issue number | 5 |
DOIs | |
Publication status | Published - Jun 2006 |
Keywords
- GROUND-STATES
- VALENCE-BOND
- SPIN-PEIERLS
- LATTICE