Multiple magneto-phonon resonances in graphene. (27th January 2016)

• Record Type: Journal Article
• Authors: Basko, D M; Leszczynski, P; Faugeras, C; Binder, J; Nicolet, A A L; Kossacki, P; Orlita, M; Potemski, M
• Is Part Of: 2D materials. Volume 3:Number 1(2016)
• Publication Date: 2016-01-27
• Subjects: magnetophonon resonance -- electron–phonon coupling -- magneto-Raman spectroscopy; 73.22.Lp -- 63.20.Kd -- 78.30.Na -- 78.67.-n; Graphene -- Periodicals; Materials science -- Periodicals; Nanostructured materials -- Periodicals; 620.115
• DOI: 10.1088/2053-1583/3/1/015004
• Languages: English
• ISSNs: 2053-1583

Abstract

Abstract: Our low-temperature magneto-Raman scattering measurements performed on graphene-like locations on the surface of bulk graphite, carries the energyite reveal a new series of magneto-phonon resonances involving both K point and Γ point phonons. These are resonances between a purely electronic excitation, an electronic excitation accompanied by one phonon, and a two-phonon excitation. In particular, we observe the resonant splitting of three crossing excitation branches. We give a detailed theoretical analysis of these multi-excitation resonances. Our results highlight the role of combined excitations and the importance of multi-phonon processes (from both K and Γ points) for the relaxation of hot carriers in graphene.