Evidence for Flat Bands near the Fermi Level in Epitaxial Rhombohedral Multilayer Graphene

被引：82

作者：

Pierucci, Debora ^{[1
]}

Sediri, Haikel ^{[1
]}

Hajlaoui, Mahdi ^{[1
,2
]}

Girard, Jean-Christophe ^{[1
]}

Brumme, Thomas ^{[3
]}

Calandra, Matteo ^{[3
]}

Velez-Fort, Emilio ^{[1
,3
]}

Patriarche, Gilles ^{[1
]}

Silly, Mathieu G. ^{[2
]}

Ferro, Gabriel ^{[4
]}

Souliere, Veronique ^{[4
]}

Marangolo, Massimiliano ^{[5
,6
]}

Sirotti, Fausto ^{[2
]}

Mauri, Francesco ^{[3
]}

Ouerghi, Abdelkarim ^{[1
]}

机构：

[1] CNRS, LPN, F-91460 Marcoussis, France

[2] Synchrotron SOLEIL, F-91192 Gif Sur Yvette, France

[3] Univ Paris 06, Sorbonne Univ, CNRS,IRD, Inst Mineral Phys Mat & Cosmochim,UMR 7590,MNHN, F-75005 Paris, France

[4] Univ Lyon 1, UMR 5615, Lab Multimat & Interfaces, F-69100 Villeurbanne, France

[5] Univ Paris 06, Univ Paris 04, INSP, UMR 7588, F-75005 Paris, France

[6] CNRS, UMR 7588, Inst Nanosci Paris, F-75005 Paris, France

来源：

ACS NANO | 2015年 / 9卷 / 05期

关键词：

rhombohedral multilayer graphene; flat band; density functional theory; angle-resolved photoemission spectroscopy; STM/STS; STEM; TRILAYER GRAPHENE; GRAPHITE; LAYERS;

D O I：

10.1021/acsnano.5b01239

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The stacking order of multilayer graphene has a profound influence on its electronic properties. In particular, it has been predicted that a rhombohedral stacking sequence displays a very flat conducting surface state: the longer the sequence, the flatter the band. In such a flat band, the role of electron electron correlation is enhanced, possibly resulting in high T-c superconductivity, magnetic order, or charge density wave order. Here we demonstrate that rhombohedral multilayers are easily obtained by epitaxial growth on 3C-S1C(111) on a 2 degrees off-axis 6H-SiC(0001). The resulting samples contain rhombohedral sequences of five layers on 70% of the surface. We confirm the presence of the flat band at the Fermi level by scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy, in close agreement with the predictions of density functional theory calculations.

引用

页码：5432 / 5439

页数：8

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