Probing Enhanced Electron-Phonon Coupling in Graphene by Infrared Resonance Raman Spectroscopy

被引：12

作者：

Venanzi, Tommaso ^{[1
]}

Graziotto, Lorenzo ^{[1
]}

Macheda, Francesco ^{[2
]}

Sotgiu, Simone ^{[1
]}

Ouaj, Taoufiq ^{[3
,4
]}

Stellino, Elena ^{[5
]}

Fasolato, Claudia ^{[6
]}

Postorino, Paolo ^{[1
]}

Miseikis, Vaidotas ^{[2
,7
]}

Metzelaars, Marvin ^{[8
]}

Koegerler, Paul ^{[8
]}

Beschoten, Bernd ^{[3
,4
]}

Coletti, Camilla ^{[2
,7
]}

Roddaro, Stefano ^{[9
]}

Calandra, Matteo ^{[10
]}

Ortolani, Michele ^{[1
]}

Stampfer, Christoph ^{[3
,4
]}

Mauri, Francesco ^{[1
,2
]}

Baldassarre, Leonetta ^{[1
]}

机构：

[1] Sapienza Univ Rome, Dept Phys, Piazzale Aldo Moro 5, I-00185 Rome, Italy

[2] Ist Italiano Tecnol, Graphene Labs, Via Morego 30, I-16163 Genoa, Italy

[3] Rhein Westfal TH Aachen, JARA FIT, D-52074 Aachen, Germany

[4] Rhein Westfal TH Aachen, Inst Phys 2, D-52074 Aachen, Germany

[5] Univ Perugia, Dept Phys & Geol, via Alessandro Pascoli, I-06123 Perugia, Italy

[6] Inst Complex Syst, Natl Res Council ISC CNR, I-00185 Rome, Italy

[7] Ist Italiano Tecnol, Ctr Nanotechnol Innovat NEST, Piazza San Silvestro 12, I-56126 Pisa, Italy

[8] Rhein Westfal TH Aachen, Inst Inorgan Chem, D-52074 Aachen, Germany

[9] Univ Pisa, Dept Phys, Largo B Pontecorvo 3, I-56127 Pisa, Italy

[10] Univ Trento, Dept Phys, Via Sommar 14, I-38123 Povo, Italy

来源：

PHYSICAL REVIEW LETTERS | 2023年 / 130卷 / 25期

关键词：

APPROXIMATION; TOOL;

D O I：

10.1103/PhysRevLett.130.256901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on resonance Raman spectroscopy measurements with excitation photon energy down to 1.16 eV on graphene, to study how low-energy carriers interact with lattice vibrations. Thanks to the excitation energy close to the Dirac point at K, we unveil a giant increase of the intensity ratio between the double-resonant 2D and 2D' peaks with respect to that measured in graphite. Comparing with fully ab initio theoretical calculations, we conclude that the observation is explained by an enhanced, momentum -dependent coupling between electrons and Brillouin zone-boundary optical phonons. This finding applies to two-dimensional Dirac systems and has important consequences for the modeling of transport in graphene devices operating at room temperature.

引用

页数：7