Rights statement: © 2010 The American Physical Society
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Spectral features due to inter-Landau-level transitions in the Raman spectrum of bilayer graphene
AU - Mucha-Kruczynski, Marcin
AU - Kashuba, Oleksiy
AU - Falko, Vladimir
N1 - © 2010 The American Physical Society
PY - 2010/7/8
Y1 - 2010/7/8
N2 - We investigate the contribution of the low-energy electronic excitations toward the Raman spectrum of bilayer graphene for the incoming photon energy Omega greater than or similar to 1 eV. Starting with the four-band tight-binding model, we derive an effective scattering amplitude that can be incorporated into the commonly used two-band approximation. Due to the influence of the high-energy bands, this effective scattering amplitude is different from the contact interaction amplitude obtained within the two-band model alone. We then calculate the spectral density of the inelastic light scattering accompanied by the excitation of electron-hole pairs in bilayer graphene. In the absence of a magnetic field, due to the parabolic dispersion of the low-energy bands in a bilayer crystal, this contribution is constant and in doped structures has a threshold at twice the Fermi energy. In an external magnetic field, the dominant Raman-active modes are the n(-) -> n(+) inter-Landau-level transitions with crossed polarization of in/out photons. We estimate the quantum efficiency of a single n(-) -> n(+) transition in the magnetic field of 10 T as In- (n+) similar to 10(-12).
AB - We investigate the contribution of the low-energy electronic excitations toward the Raman spectrum of bilayer graphene for the incoming photon energy Omega greater than or similar to 1 eV. Starting with the four-band tight-binding model, we derive an effective scattering amplitude that can be incorporated into the commonly used two-band approximation. Due to the influence of the high-energy bands, this effective scattering amplitude is different from the contact interaction amplitude obtained within the two-band model alone. We then calculate the spectral density of the inelastic light scattering accompanied by the excitation of electron-hole pairs in bilayer graphene. In the absence of a magnetic field, due to the parabolic dispersion of the low-energy bands in a bilayer crystal, this contribution is constant and in doped structures has a threshold at twice the Fermi energy. In an external magnetic field, the dominant Raman-active modes are the n(-) -> n(+) inter-Landau-level transitions with crossed polarization of in/out photons. We estimate the quantum efficiency of a single n(-) -> n(+) transition in the magnetic field of 10 T as In- (n+) similar to 10(-12).
U2 - 10.1103/PhysRevB.82.045405
DO - 10.1103/PhysRevB.82.045405
M3 - Journal article
VL - 82
JO - Physical review B
JF - Physical review B
SN - 1098-0121
IS - 4
M1 - 045405
ER -