Scanning Probe and Electronic Transport Studies of Band-gap Opening in Graphene

2015 Fiscal Year Final Research Report

• Project/Area Number: 25800191
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: Matsui Tomohiro 東京大学, 理学(系)研究科(研究院), 助教 (40466793)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: グラフェン / 走査トンネル顕微・分光法 / 電気伝導特性 / バンド・ギャップ

Outline of Final Research Achievements

This project was started aiming to induce a band-gap to graphene and to elucidate the mechanism of it. Two methods were employed in this study, one is to adsorb atoms or molecules on graphene and the other is to engineer graphene by making nanopits. For the first method, though a band-gap is expected by breaking the chiral symmetry of graphene by adsorbate, any sign of band gap opening could be observed. For the latter method, on the other hand, we succeeded to make hexagonal nanopits with zigzag edges and monatomic depth. By using a scanning tunneling microscopy and spectroscopy techniques at low temperatures, band gap opening in graphene nanoribbon were observed. In addition, the relation between quantum hall edge state and zigzag edge state in graphene were shown clearly in real space.

Free Research Field

低温電子物性