Electronic transport through ballistic chaotic cavities: Reflection symmetry, direct processes, and symmetry breaking - art. no. 016205

Citation
M. Martinez et Pa. Mello, Electronic transport through ballistic chaotic cavities: Reflection symmetry, direct processes, and symmetry breaking - art. no. 016205, PHYS REV E, 6302(2), 2001, pp. 6205
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW E
ISSN journal
1063-651X → ACNP
Volume
6302
Issue
2
Year of publication
2001
Part
2
Database
ISI
SICI code
1063-651X(200101)6302:2<6205:ETTBCC>2.0.ZU;2-H
Abstract
We extend previous studies on transport through ballistic chaotic cavities with spatial left-right (LR) reflection symmetry to include the presence of direct processes. We first analyze fully LR-symmetric systems in the prese nce of direct processes and compare the distribution w(T) Of the transmissi on coefficient T with that for an asymmetric cavity with the same ''optical " S matrix. We then study the problem of ''external mixing" of the symmetry caused by an asymmetric coupling of the cavity to the outside. We first co nsider the case where symmetry breaking arises because two symmetrically po sitioned waveguides are coupled to the cavity by means of asymmetric tunnel barriers. Although this system is asymmetric with respect to the LR operat ion, there is an effect of the symmetry of the cavity it was constructed fr om. Second, we break LR symmetry in the absence of direct processes by asym metrically positioning the two waveguides and compare the results with thos e fur the completely asymmetric case.