کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1544058 1512878 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Weak-localization approach to a 2D electron gas with a spectral node
ترجمه فارسی عنوان
رویکرد محلی سازی ضعیف به یک گاز الکترون دو بعدی با یک گره طیفی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
چکیده انگلیسی

We study a weakly disordered 2D electron gas with two bands and a spectral node within the weak-localization approach and compare its results with those of Gaussian fluctuations around the self-consistent Born approximation. The appearance of diffusive modes depends on the type of disorder. In particular, we find for a random gap a diffusive mode only from ladder contributions, whereas for a random scalar potential the diffusive mode is created by ladder and by maximally crossed contributions. The ladder (maximally crossed) contributions correspond to fermionic (bosonic) Gaussian fluctuations. We calculate the conductivity corrections from the density–density Kubo formula and find a good agreement with the experimentally observed V-shape conductivity of graphene.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 71, July 2015, Pages 14–20
نویسندگان
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