Origin of the 0.25-anomaly in the nonlinear conductance of a quantum point contact

Abstract

We calculate the non-linear conductance of a quantum point contact using the non-equilibrium Greens function technique within the Hartree approximation of spinless electrons. We quantitative reproduce the 0.25-anomaly in the differential conductance (i.e. the lowest plateau at 0.25-0.3*2e^2/h) as well as an upward bending of higher conductance half-integer plateaus seen in the experiments, and relate these features to the non-linear screening and pinning effects.

6 pages, 4 figures

References in corpus (4)

• Spin polarization of edge states and magnetosubband structure in quantum wires
• Energy-level pinning and the 0.7 spin state in one dimension: GaAs quantum wires studied using finite-bias spectroscopy
• Conductance of a quantum point contact based on spin-density-functional theory
• Effect of Electron Interaction on Statistics of Conductance Oscillations in Open Quantum Dots: Does the Dephasing Time Saturate?

Cited by in corpus (8)

• What lurks below the last plateau: Experimental studies of the 0.7 x 2e^2/h conductance anomaly in one-dimensional systems
• All-electrical injection and detection of a spin polarized current using 1D conductors
• Zero-bias Anomaly of Quantum Point Contacts in the Low-Conductance Limit
• Spin fluctuations in the 0.7-anomaly in quantum point contacts
• Evidence for Charging Effects in CdTe/CdMgTe Quantum Point Contacts
• Temperature Modulation of the Transmission Barrier in Quantum Point Contacts
• Nonlinear conductance quantization in graphene ribbons
• First-principles study of electron transport in few-electron open quantum dots by the Hartree-Fock approach