By Marcin Mucha-Kruczy?ski
This thesis provides the idea of 3 key components of optical spectroscopy of the digital excitations in bilayer graphene: angle-resolved photoemission spectroscopy (ARPES), obvious variety Raman spectroscopy, and far-infrared (FIR) magneto-spectroscopy. Bilayer graphene (BLG) is an atomic two-dimensional crystal including honeycomb monolayers of carbon, prepared based on Bernal stacking. The unperturbed BLG has a different band constitution, which beneficial properties chiral states of electrons with a attribute Berry part of 2$\pi$, and it has flexible houses that are managed by means of an externally utilized transverse electrical box and pressure. it truly is proven during this paintings how ARPES of BLG can be utilized to procure direct information regarding the chirality of electron states within the crystal. the writer is going directly to describe the impression of the interlayer asymmetry, which opens a spot in BLG, on ARPES and on FIR spectra in a powerful magnetic box. eventually, he offers a entire conception of inelastic Raman scattering leading to the electron-hole excitations in bilayer graphene, at 0 and quantizing magnetic fields. This predicts their polarization homes and weird choice principles when it comes to the inter-Landau-level transitions.
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Extra resources for Theory of Bilayer Graphene Spectroscopy
14, for (a) whole Brillouin zone; (b) and (c) valley K + ; (d) and (e) valley K − . Energy corresponding to each map is given with respect to the Dirac point. The length of the 8π side of the map in the reciprocal space is 10π 3a and 75a for (a) and (b)–(e), respectively. 46 Å The peculiar behaviour of the ARPES intensity as a function of the azimuthal angle ϕ around the valley K ξ has been noticed before for bulk graphite . As shown, its origins lie purely in the hexagonal symmetry of graphene.
H. Lui, J. F. Heinz, Observation of an electric-field-induced band gap in bilayer graphene by infrared spectroscopy. Phys. Rev. Lett. 102, 256405 (2009) 27. M. Mucha-Kruczy´nski, E. I. Fal’ko, Electron-hole asymmetry and energy gaps in bilayer graphene. Semicond. Sci. Technol. 25, 033001 (2010) 28. E. I. Fal’ko, Landau level degeneracy and quantum hall effect in a graphite bilayer. Phys. Rev. Lett. 96, 086805 (2006) 29. L. I. Fal’ko, Optical and magneto-optical far-infrared properties of bilayer graphene.
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Theory of Bilayer Graphene Spectroscopy by Marcin Mucha-Kruczy?ski