Van der Waals torque induced by external magnetic fields
Por:
Esquivel-Sirvent R., Cocoletzi G.H., Palomino-Ovando M.
Publicada:
1 dic 2010
Categoría:
Physics and Astronomy (miscellaneous)
Resumen:
We present a method for inducing and controlling van der Waals torques between two parallel slabs using a constant magnetic field. The torque is calculated using the Barash theory of dispersive torques. In III-IV semiconductors such as InSb, the effect of an external magnetic field is to induce an optical anisotropy, in an otherwise isotropic material, that will in turn induce a torque. The calculations of the torque are done in the Voigt configuration, with the magnetic field parallel to the surface of the slabs. As a case study we consider a slab made of calcite and a second slab made of InSb. In the absence of magnetic field there is no torque. As the magnetic field increases, the optical anisotropy of InSb increases and the torque becomes different from zero, increasing with the magnetic field. The resulting torque is of the same order of magnitude as that calculated using permanent anisotropic materials when the magnetic fields is close to 1 T. (C) 2010 American Institute of Physi
Filiaciones:
Esquivel-Sirvent R.:
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico
Cocoletzi G.H.:
Instituto de Física, Universidad Autónoma de Puebla, Apartado Postal J-48, Puebla 72570, Mexico
Palomino-Ovando M.:
Facultad de Ciencias Fisico-Matemáticas, Universidad Autónoma de Puebla, Apartado Postal 5214, Puebla 72000, Mexico
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