Formation mechanism of bound states in graphene point contacts

Hai Yao Deng, Katsunori Wakabayashi, Chi Hang Lam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)

Abstract

Electronic localization in narrow graphene constrictions is theoretically studied, and it is found that long-lived (∼1 ns) quasibound states (QBSs) can exist in a class of ultrashort graphene quantum point contacts (QPCs). These QBSs are shown to originate from the dispersionless edge states that are characteristic of the electronic structure of generically terminated graphene, in which pseudo-time-reversal symmetry is broken. The QBSs can be regarded as interface states confined between two graphene samples, and their properties can be modified by changing the sizes of the QPC and the interface geometry. In the presence of bearded sites, these QBSs can be converted into bound states. Experimental consequences and potential applications are discussed.
Original languageEnglish
Article number045423
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number4
DOIs
Publication statusPublished - 22 Jan 2014

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this