Multiple Dirac particles in AA-stacked graphite and multilayers of graphene
I Lobato, B Partoens - Physical Review B—Condensed Matter and Materials …, 2011 - APS
Physical Review B—Condensed Matter and Materials Physics, 2011•APS
Using the tight-binding formalism we show that in the recently experimentally realized AA-
stacked graphite in essence two types of massless relativistic Dirac particles are present
with a different effective speed of light. We also investigate how the electronic structure
evolves from a single graphene sheet into AA-stacked graphite. It is shown that in contrast to
AB-stacked graphene layers, the spectrum of AA-stacked graphene layers can be
considered as a superposition of single-layer spectra and only particles with a linear …
stacked graphite in essence two types of massless relativistic Dirac particles are present
with a different effective speed of light. We also investigate how the electronic structure
evolves from a single graphene sheet into AA-stacked graphite. It is shown that in contrast to
AB-stacked graphene layers, the spectrum of AA-stacked graphene layers can be
considered as a superposition of single-layer spectra and only particles with a linear …
Using the tight-binding formalism we show that in the recently experimentally realized AA-stacked graphite in essence two types of massless relativistic Dirac particles are present with a different effective speed of light. We also investigate how the electronic structure evolves from a single graphene sheet into AA-stacked graphite. It is shown that in contrast to AB-stacked graphene layers, the spectrum of AA-stacked graphene layers can be considered as a superposition of single-layer spectra and only particles with a linear spectrum at the Fermi energy around the point are present. From the evolution of the band overlap we show that 6 multilayers of AA-stacked graphene already behave as AA-stacked graphite. The evolution of the effective speeds of light of the Dirac particles to their bulk values shows exactly the same behavior. The tight-binding parameters we use to describe AA-stacked graphite and multilayers of graphene are obtained by ab initio calculations.
American Physical Society