Symmetry Classes in Graphene Quantum Dots: Universal Spectral Statistics, Weak Localization, and Conductance Fluctuations

Simple item page
dc.creatorWurm, J.
dc.creatorRycerz, A.
dc.creatorAdagideli, I.
dc.creatorWimmer, M.
dc.creatorRichter, K.
dc.creatorBaranger, H. U.
dc.date2008-08-07
dc.date.accessioned2026-07-07T12:38:43Z
dc.date.available2026-07-07T12:38:43Z
dc.descriptionWe study the symmetry classes of graphene quantum dots, both open and closed, through the conductance and energy level statistics. For abrupt termination of the lattice, these properties are well described by the standard orthogonal and unitary ensembles. However, for smooth mass confinement, special time-reversal symmetries associated with the sublattice and valley degrees of freedom are critical: they lead to block diagonal Hamiltonians and scattering matrices with blocks belonging to the unitary symmetry class even at zero magnetic field. While the effect of this structure is clearly seen in the conductance of open dots, it is suppressed in the spectral statistics of closed dots, because the intervalley scattering time is shorter than the time required to resolve a level spacing in the closed systems but longer than the escape time of the open systems.
dc.description4 pages, 4 figures, RevTex, submitted to Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/0808.1008
dc.identifierhttp://arxiv.org/abs/0808.1008
dc.identifierPhys. Rev. Lett. 102, 056806 (2009)
dc.identifierdoi:10.1103/PhysRevLett.102.056806
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/218859
dc.subjectMesoscale and Nanoscale Physics
dc.titleSymmetry Classes in Graphene Quantum Dots: Universal Spectral Statistics, Weak Localization, and Conductance Fluctuations
dc.typetext

Files

Collections

arXiv