Impurity scattering and size quantization effects in a single graphene nanoflake

被引：8

作者：

Tesch, Julia ^{[1
]}

Leicht, Philipp ^{[1
]}

Blumenschein, Felix ^{[1
]}

Gragnaniello, Luca ^{[1
]}

Bergvall, Anders ^{[2
]}

Lofwander, Tomas ^{[2
]}

Fonin, Mikhail ^{[1
]}

机构：

[1] Univ Konstanz, Fachbereich Phys, D-78457 Constance, Germany

[2] Chalmers, Dept Microtechnol & Nanosci MC2, SE-41296 Gothenburg, Sweden

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 07期

关键词：

EPITAXIAL GRAPHENE; ELECTRONIC-PROPERTIES; NANORIBBONS; FABRICATION; TRANSPORT; AG(111); STATE; FILMS;

D O I：

10.1103/PhysRevB.95.075429

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

By using Fourier-transform scanning tunneling spectroscopy we measure the interference patterns produced by the impurity scattering of confined Dirac quasiparticles in epitaxial graphene nanoflakes. Upon comparison of the experimental results with tight-binding calculations of realistic model flakes, we show that the characteristic features observed in the Fourier-transformed local density of states are related to scattering between different transverse modes (subbands) of a graphene nanoflake and allow direct insight into the gapped electronic spectrum of graphene. We also observe a strong reduction of quasiparticle lifetime which is attributed to the interaction with the underlying substrate. In addition, we show that the distribution of the on-site energies at flower defects leads to an effectively broken pseudospin selection rule, where intravalley backscattering is allowed.

引用

页数：5

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