کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5492447 1525684 2016 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Duality in spin fluctuation in correlated electron systems
ترجمه فارسی عنوان
دوگانگی در نوسانات چرخشی در سیستم های الکترونی همبسته
کلمات کلیدی
ابررسانایی با درجه حرارت بالا، مدل هابارد منطقه همیشگی، روش متداول مونت کارلو، نوسان چرخش، وابستگی سینتیک-شارژ،
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
چکیده انگلیسی
An origin of high-temperature superconductivity for cuprate superconductors is investigated on the basis of the two-dimensional Hubbard model. The Coulomb interaction is a candidate that can bring about high-temperature superconductivity because its characteristic energy is of the order of eV. It is not trivial whether the on-site Coulomb interaction U leads to a pairing interaction between two electrons. We argue that the antiferromagnetic fluctuation and the kinetic charge fluctuation are responsible for high-temperature superconductivity. The kinetic charge fluctuation is induced by large U to get the kinetic energy gain in the strongly correlated region. We consider electron correlation beyond the Gutzwiller ansatz, by taking account of inter-site correlation such as doublon-holon correlation and kinetic correlation. We show that high-temperature superconductivity is possible in the strongly correlated region, where U is greater than the bandwidth, by using the variational Monte Carlo method.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity and its Applications - Volume 530, 15 November 2016, Pages 1-4
نویسندگان
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