کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1841302 1031328 2011 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Quantum phase diagram of the half filled Hubbard model with bond-charge interaction
موضوعات مرتبط
مهندسی و علوم پایه ریاضیات فیزیک ریاضی
پیش نمایش صفحه اول مقاله
Quantum phase diagram of the half filled Hubbard model with bond-charge interaction
چکیده انگلیسی

Using quantum field theory and bosonization, we determine the quantum phase diagram of the one-dimensional Hubbard model with bond-charge interaction X in addition to the usual Coulomb repulsion U at half-filling, for small values of the interactions. We show that it is essential to take into account formally irrelevant terms of order X  . They generate relevant terms proportional to X2X2 in the flow of the renormalization group (RG). These terms are calculated using operator product expansions. The model shows three phases separated by a charge transition at U=UcU=Uc and a spin transition at U=Us>UcU=Us>Uc. For UUsU>Us, the system is in the spin-density wave phase as in the usual Hubbard model. For intermediate values Uc

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics B - Volume 843, Issue 3, 21 February 2011, Pages 767–783
نویسندگان
, ,