کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5495841 1529826 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Topological end states and Zak phase of rectangular armchair ribbon
ترجمه فارسی عنوان
پایان های توپولوژیکی و فاز زک روبان صندلی مستطیلی
کلمات کلیدی
نانوسیستم گرافن، شارژ مکرر، مغناطیسی لبه، وضعیت نهایی، قطبش، فاز زک،
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک و نجوم (عمومی)
چکیده انگلیسی
We consider the end states of a half-filled rectangular armchair graphene ribbon (RAGR) in a staggered potential. Taking electron-electron interactions into account we find that, as the strength of the staggered potential varies, three types of couplings between the end states can occur: antiferromagnetic without or with spin splitting, and paramagnetic without spin-splitting. We find that a spin-splitting is present only in the staggered potential region 0<Δ<Δc. The transition from the antiferromagnetic state at Δ=0 to the paramagnetic state goes through an intermediate spin-split antiferromagnetic state, and this spin-splitting disappears suddenly at Δc. For small and large values of Δ the end charge of a RAGR can be connected to the Zak phase of the periodic armchair graphene ribbon (PARG) with the same width, and it varies continuously as the strength of the potential changes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Annals of Physics - Volume 385, October 2017, Pages 688-694
نویسندگان
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