Coulomb Charging Effects in an Open Quantum Dot

Abstract

Low-temperature transport properties of a lateral quantum dot formed by overlaying finger gates in a clean one-dimensional channel are investigated. Continuous and periodic oscillations superimposed upon ballistic conductance steps are observed, when the conductance G of the dot changes within a wide range 0<G<6e^2/h. Calculations of the electrostatics confirm that the measured periodic conductance oscillations correspond to successive change of the total charge of the dot by $e$. By modelling the transport it is shown that the progression of the Coulomb oscillations into the region G>2e^2/h may be due to suppression of inter-1D-subband scattering. Fully transmitted subbands contribute to coherent background of conductance, while sequential tunneling via weakly transmitted subbands leads to Coulomb charging of the dot.

12 pages, RevTeX, 15 eps figures included, submitted to Phys. Rev. B

References in corpus (6)

• Coulomb Blockade without Tunnel Junctions
• Mesoscopic charge quantization
• Experimental Evidence for Coulomb Charging Effects in an Open Quantum Dot at Zero Magnetic Field
• Spin-charge separation and Kondo effect in an open quantum dot
• Mesoscopic Coulomb Blockade in One-channel Quantum Dots
• Spin-dependent transport in a clean one-dimensional channel

Cited by in corpus (5)

• Controlling charge quantization with quantum fluctuations
• Symmetry causes a huge conductance peak in double quantum dots
• Coulomb Blockade in an Open Quantum Dot
• Interacting electrons in the Aharonov-Bohm interferometer
• Evidence for Charging Effects in CdTe/CdMgTe Quantum Point Contacts