Fractional plateaus in the Coulomb blockade of coupled quantum dots

Abstract

Ground-state properties of a double-large-dot sample connected to a reservoir via a single-mode point contact are investigated. When the interdot transmission is perfect and the dots controlled by the same dimensionless gate voltage, we find that for any finite backscattering from the barrier between the lead and the left dot, the average dot charge exhibits a Coulomb-staircase behavior with steps of size e/2 and the capacitance peak period is halved. The interdot electrostatic coupling here is weak. For strong tunneling between the left dot and the lead, we report a conspicuous intermediate phase in which the fractional plateaus get substantially altered by an increasing slope.

6 pages, 4 figures, final version

References in corpus (4)

• Electron transport through double quantum dots
• Capacitance of a quantum dot from the channel-anisotropic two-channel Kondo model
• Zeeman smearing of the Coulomb blockade
• Coulomb blockade of strongly coupled quantum dots studied via bosonization of a channel with a finite barrier

Cited by in corpus (4)

• Maximized Orbital and Spin Kondo effects in a single-electron transistor
• Seebeck effect on a weak link between Fermi and non-Fermi liquids
• Thermoelectric transport across a tunnel contact between two charge Kondo circuits: beyond perturbation theory
• Tunneling in multi-site mesoscopic quantum Hall circuits