Influência de campo magnético e rotação no espectro energético de Nanotubos de Carbono.

Abstract

Currently, the study of the physical properties of nanomaterials has been a vast field of study in Condensed Matter Physics and Materials Science and Engineering. Such objects have various applications like making electronic devices smaller and more efficient, for example. Carbon nanotubes are an interesting class in this regard due to their experimental synthesis and theoretical description well established in the literature. A carbon nanotube can be viewed as a rolled up graphene sheet. In 2002, Kral and Sadeghpoura investigated the rotation of nanotubes by applying lasers. Motivated by this achievement, in this work we focus the description of the dynamics of the charge carriers in a spinning nanotube , but this time also considering a magnetic field . For this, we begin with an effective Dirac Hamiltonian for massless fermions, as done for the case of graphene, but in this case using coordinates z and f.The vector potentials associated to the magnetic field and to rotation(Coriolis field) enter Dirac equation via the usual minimal coupling.The Coriolis vector potential comes from the idea of the Aharonov-Carmi, an "rotational"analog the celebrated Aharonov-Bohm effect. Finally, we analyze the influence of the presence of the field and the rotation in the energy spectrum.