Negative differential conductance in quantum dots in theory and experiment

Abstract

Experimental results for sequential transport through a lateral quantum dot in the regime of spin blockade induced by spin dependent tunneling are compared with theoretical results obtained by solving a master equation for independent electrons. Orbital and spin effects in electron tunneling in the presence of a perpendicular magnetic field are identified and discussed in terms of the Fock-Darwin spectrum with spin. In the nonlinear regime, a regular pattern of negative differential conductances is observed. Electrical asymmetries in tunnel rates and capacitances must be introduced in order to account for the experimental findings. Fast relaxation of the excited states in the quantum dot have to be assumed, in order to explain the absence of certain structures in the transport spectra.

4 pages, 4 figures

References in corpus (14)

• Spin relaxation in semiconductor quantum dots
• The Addition Spectrum of a Lateral Dot from Coulomb and Spin Blockade Spectroscopy
• Spin relaxation and anticrossing in quantum dots: Rashba versus Dresselhaus spin-orbit coupling
• The Collapse of the Spin-Singlet Phase in Quantum Dots
• Super-poissonian noise, negative differential conductance, and relaxation effects in transport through molecules, quantum dots and nanotubes
• Selection Rules for Transport Excitation Spectroscopy of Few-Electron Quantum Dots
• Transport in multilevel quantum dots: from the Kondo effect to the Coulomb blockade regime
• Shot noise of coupled semiconductor quantum dots
• Tunable Negative Differential Resistance controlled by Spin Blockade in Single Electron Transistors
• Negative differential conductance induced by spin-charge separation
• Spin blockade in ground state resonance of a quantum dot
• Signatures of electron correlations in the transport properties of quantum dots
• Spin Blockade in Capacitively Coupled Quantum Dots
• Combined atomic force microscope and electron-beam lithography used for the fabrication of variable-coupling quantum dots

Cited by in corpus (8)

• Coherent Transport through an interacting double quantum dot: Beyond sequential tunneling
• Spin projected unrestricted Hartree-Fock ground states for harmonic quantum dots
• Interaction-Induced Spin Polarization in Quantum Dots
• Spin and rotational symmetries in unrestricted Hartree Fock states of quantum dots
• Time-dependent magnetotransport of a wave packet in a quantum wire with embedded quantum dots
• Dark channels in resonant tunneling transport through artificial atoms
• Negative Differential Spin Conductance by Population Switching
• Universal Statistics of Charges Exchanges in Non-Abelian Quantum Transport