کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1855454 1529961 2006 18 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ground-state phases and quantum phase transitions in a two-dimensional spin-1/2 XY model with four-spin interactions
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک و نجوم (عمومی)
پیش نمایش صفحه اول مقاله
Ground-state phases and quantum phase transitions in a two-dimensional spin-1/2 XY model with four-spin interactions
چکیده انگلیسی

We discuss the ground state phase transition between an antiferromagnet and a valence-bond solid in a two-dimensional spin-1/2 XY model with a four-spin interaction. This transition has been proposed as a candidate for a deconfined quantum-critical point. We analyze quantum Monte Carlo data in order to accurately characterize the transition. The central question that remains to be answered is whether the transition really is continuous, or whether it is actually weakly first-order. We present the current status of both ground state and finite-temperature calculations. Based on the results, we discuss possible scenarios for the transition, none of which is consistent with deconfined quantum-criticality. However, we argue that a deconfined quantum-critical point may be located nearby in an extended parameter space.We also discuss the staggered Ising phase obtaining in the limit of strong four-spin coupling.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Annals of Physics - Volume 321, Issue 7, July 2006, Pages 1651–1668
نویسندگان
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