Splitting of conductance resonance through a magnetic quantum dot in graphene

Cited 0 time in webofscience Cited 0 time in scopus
12 Viewed 4 Downloaded
Title
Splitting of conductance resonance through a magnetic quantum dot in graphene
Author(s)
Myoung, N; Jung-Wan Ryu; Hee Chul Park; Lee, SJ; Sungjong Woo
Publication Date
2019-07
Journal
PHYSICAL REVIEW B, v.100, no.4, pp.045427 -
Publisher
AMER PHYSICAL SOC
Abstract
We report a dual resonance feature in the ballistic conductance through a quantum Hall graphene nanoribbon with a magnetic quantum dot. Such a magnetic quantum dot localizes Dirac fermions exhibiting anisotropic eigenenergy spectra with broken time-reversal symmetry. Interplay between the localized states and quantum Hall edge states is found to be twofold, showing Breit-Wigner and Fano resonances, which is reminiscent of a double quantum dot system. By fitting the numerical results with the Fano-Breit-Wigner line shape from the double quantum dot model, we demonstrate that the twofold resonance is due to the valley mixing that comes from the coupling of the magnetic quantum dot with quantum Hall edge channels; an effective double quantum dot system emerges from a single magnetic quantum dot in virtue of the valley degree of freedom. It is further confirmed that the coupling is weaker for the Fano resonance and stronger for the Breit-Wigner resonance. ©2019 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/6149
ISSN
2469-9950
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
Files in This Item:
PhysRevB.100.045427.pdfDownload

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse