LDA energy bands, low-energy hamiltonians, t′, t″, t⊥ (k), and J⊥
نویسندگان
چکیده
منابع مشابه
Low-energy spectra in t-J-type models at low doping levels.
Based on a variational approach, we propose that there are two kinds of low-energy states in the t-J-type models at low doping. In a quasiparticle state an unpaired spin bound to a hole with a well-defined momentum can be excited with spin waves. The resulting state shows a suppression of antiferromagnetic order around the hole with the profile of a spin bag. These spin-bag states with spin and...
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آویشن (Thymus) از تیره Lamiaceae گیاهی است چند ساله که به‌دلیل خاصیت دارویی از اهمیت بالایی برخوردار است. بذرهای پنج جمعیت متعلق به چهار گونه T. Lancifolius،T. daenensis subsp. daenensis (دو نمونه)، T. fedtschenkoiو pubescens .Tکشت گردید و پس از جوانه‌زنی بذرها از مریستم انتهایی ریشه برای مطالعات کاریوتیپی استفاده شد. نتایج نشان داد که تعداد کروموزوم پایه در تمام جمعیت‌های مورد بررسی 15= x اس...
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متن کاملLow Energy Effective Action of Lightly Doped Two-Leg t-J Ladders
We derive the low energy effective action of lightly doped two-leg t-J ladders with the help of slave fermion technique. Because of the underlying spin liquid state, we can assume the existence of a short-ranged antiferromagnetic order for some range of parameters in the lightly doped case. This leads to the usual t ′ − J model. The continum limit of this model consists of two kinds of Dirac fe...
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ژورنال
عنوان ژورنال: Journal of Physics and Chemistry of Solids
سال: 1995
ISSN: 0022-3697
DOI: 10.1016/0022-3697(95)00269-3