Zero-bias anomaly and Kondo-assisted quasi-ballistic 2D transport

Abstract

Nonequilibrium transport measurements in mesoscopic quasi-ballistic 2D electron systems show an enhancement in the differential conductance around the Fermi energy. At very low temperatures, such a zero-bias anomaly splits, leading to a suppression of linear transport at low energies. We also observed a scaling of the nonequilibrium characteristics at low energies which resembles electron scattering by two-state systems, addressed in the framework of two-channel Kondo model. Detailed sample-to-sample reproducibility indicates an intrinsic phenomenon in unconfined 2D systems in the low electron-density regime.

arXiv comment4+ pages, accepted for publication in PRL

References in corpus (21)

• Kondo Physics in a Single Electron Transistor
• A Tunable Kondo Effect in Quantum Dots
• The Low-Temperature Fate of the 0.7 Structure in a Point Contact: A Kondo-like Correlated State in an Open System
• Interaction corrections at intermediate temperatures: I. Longitudinal conductivity and kinetic equation
• Coulomb blockade at almost perfect transmission
• Conformal Field Theory Approach to the 2-Impurity Kondo Problem: Comparison with Numerical Renormalization Group Results
• Spin-orbit coupling effects on quantum transport in lateral semiconductor dots
• Spin Susceptibility of an Ultra-Low Density Two Dimensional Electron System
• Direct Coulomb and Exchange Interaction in Artificial Atoms
• Kondo effect in real quantum dots
• Two-stage Kondo effect in a quantum dot at high magnetic field
• Quantum Phase Transition in a Multi-Level Dot
• Quantum phase transitions in models of coupled magnetic impurities
• Parallel magnetic field induced giant magnetoresistance in low density {\it quasi}-two dimensional layers
• Spin polarization and g-factor of a dilute GaAs two-dimensional electron system
• Hole-Hole Interaction Effect in the Conductance of the Two-Dimensional Hole Gas in the Ballistic Regime
• Kondo tunneling through real and artificial molecules
• Spin Degeneracy and Conductance Fluctuations in Open Quantum Dots
• Spin-Polarization transition in the two dimensional electron gas
• Possible evidence of a spontaneous spin-polarization in mesoscopic 2D electron systems
• Spin-polarized stable phases of the 2-D electron fluid at finite temperatures

Cited by in corpus (6)

• Non-Kondo zero-bias anomaly in quantum wires
• Magnetotransport in disordered delta-doped heterostructures
• Highly enhanced thermopower in two-dimensional electron systems at milliKelvin temperatures
• Origins of conductance anomalies in a p-type GaAs quantum point contact
• Field-tunable magnetic phases in a semiconductor-based two-dimensional Kondo lattice
• Sensitivity of the magnetic state of a spin lattice on itinerant electron orbital phase