کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
974696 | 932995 | 2009 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Two-time Green's function treatment of field-induced quantum criticality of a d-dimensional easy-plane ferromagnet with longitudinal uniform interactions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
فیزیک ریاضی
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![عکس صفحه اول مقاله: Two-time Green's function treatment of field-induced quantum criticality of a d-dimensional easy-plane ferromagnet with longitudinal uniform interactions Two-time Green's function treatment of field-induced quantum criticality of a d-dimensional easy-plane ferromagnet with longitudinal uniform interactions](/preview/png/974696.png)
چکیده انگلیسی
The two-time Green's function equation of motion method is employed to explore the low-temperature properties and crossovers close to the field-induced quantum critical point of a d-dimensional spin- 1/2 easy-plane ferromagnet with longitudinal uniform interactions. This is performed, on the ground of an exact mapping into an effective XY model in a transverse field, using the Tyablikov decoupling procedure, which is shown to provide, at zero temperature, the exact results recently obtained for the same model with arbitrary d and spin S. We determine the full structure of the phase diagram for different values of d and S=1/2. Some peculiarities emerge for dâ¤2 where only an isolated quantum critical point exists. For d>2 the phase boundary and crossover lines are determined and the physics of the various regions of the phase diagram is found to be consistent with recent renormalization group results. Moreover, for 2
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica A: Statistical Mechanics and its Applications - Volume 388, Issue 8, 15 April 2009, Pages 1446-1462
Journal: Physica A: Statistical Mechanics and its Applications - Volume 388, Issue 8, 15 April 2009, Pages 1446-1462
نویسندگان
L.S. Campana, L. De Cesare, U. Esposito, M.T. Mercaldo,