TY - JOUR
T1 - Dipole crystals in two-dimensional systems
AU - Olivares-Robles, M. A.
AU - Ulloa, S. E.
PY - 2002/9
Y1 - 2002/9
N2 - A two-dimensional (2D) interacting gas of excitons in a system with spatially separated electron-hole layers crystallizes at low densities into a 2D crystal. In this work, we study the properties of such a lattice for a gas of polarized excitons in the classical regime. The dipoles are assumed to be in the xy plane, while being constrained or 'polarized' in the z direction. We calculate the groundstate energy of the 2D dipole crystal, at a constant number density, for all 2D Bravais lattices. We find that, similarly to the case of point charges, the hexagonal lattice has the lowest energy.
AB - A two-dimensional (2D) interacting gas of excitons in a system with spatially separated electron-hole layers crystallizes at low densities into a 2D crystal. In this work, we study the properties of such a lattice for a gas of polarized excitons in the classical regime. The dipoles are assumed to be in the xy plane, while being constrained or 'polarized' in the z direction. We calculate the groundstate energy of the 2D dipole crystal, at a constant number density, for all 2D Bravais lattices. We find that, similarly to the case of point charges, the hexagonal lattice has the lowest energy.
UR - http://www.scopus.com/inward/record.url?scp=0036742494&partnerID=8YFLogxK
U2 - 10.1002/1521-3951(200209)233:2<280::AID-PSSB280>3.0.CO;2-Q
DO - 10.1002/1521-3951(200209)233:2<280::AID-PSSB280>3.0.CO;2-Q
M3 - Artículo
SN - 0370-1972
VL - 233
SP - 280
EP - 285
JO - physica status solidi (b)
JF - physica status solidi (b)
IS - 2
ER -