Two Distinct Phases of Bilayer Graphene Films on Ru(0001)

被引：20

作者：

Papagno, Marco ^{[1
,2
]}

Pacile, Daniela ^{[1
,2
]}

Topwal, Dinesh ^{[3
,4
]}

Moras, Paolo ^{[1
]}

Sheverdyaeva, Polina Makarovna ^{[1
]}

Natterer, Fabian Donat ^{[5
]}

Lehnert, Anne ^{[5
]}

Rusponi, Stefano ^{[5
]}

Dubout, Quentin ^{[5
]}

Calleja, Fabian ^{[5
]}

Frantzeskakis, Emmanouil ^{[5
]}

Pons, Stephane ^{[6
]}

Fujii, Jun ^{[7
]}

Vobornik, Ivana ^{[7
]}

Grioni, Marco ^{[5
]}

Carbone, Carlo ^{[1
]}

Brune, Harald ^{[5
]}

机构：

[1] CNR, Ist Struttura Mat, Trieste, Italy

[2] Univ Calabria, Dipartimento Fis, I-87036 Arcavacata Di Rende, Cs, Italy

[3] Abdus Salaam Int Ctr Theoret Phys, Trieste, Italy

[4] CSIR Cent Glass & Ceram Res Inst, Kolkata 700032, India

[5] Ecole Polytech Fed Lausanne, Inst Condensed Matter Phys, CH-1015 Lausanne, Switzerland

[6] Univ Paris 06, Inst NanoSci Paris, UMR 7588, CNRS, F-75252 Paris 05, France

[7] CNR IOM, TASC Lab, Trieste, Italy

来源：

ACS NANO | 2012年 / 6卷 / 10期

基金：

瑞士国家科学基金会;

关键词：

multilayer graphene; Ru; stacking sequence; photoemission; STM; ELECTRONIC-STRUCTURE; EPITAXIAL GRAPHENE;

D O I：

10.1021/nn303821w

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

By combining angle-resolved photoemission spectroscopy and scanning tunneling microscopy we reveal the structural and electronic properties of multilayer graphene on Ru(0001). We prove that large ethylene exposure allows the synthesis of two distinct phases of bilayer graphene with different properties. The first phase has Bernal AS stacking with respect to the first graphene layer and displays weak vertical interaction and electron doping. The long-range ordered moire pattern modulates the crystal potential and induces replicas of the Dirac cone and minigaps. The second phase has an AA stacking sequence with respect to the first layer and displays weak structural and electronic modulation and p-doping. The linearly dispersing Dirac state reveals the nearly freestanding character of this novel second-layer phase.

引用

页码：9299 / 9304

页数：6

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