Many-body spin related phenomena in ultra-low-disorder quantum wires

Abstract

Zero length quantum wires (or point contacts) exhibit unexplained conductance structure close to 0.7 X 2e^2/h in the absence of an applied magnetic field. We have studied the density- and temperature-dependent conductance of ultra-low-disorder GaAs/AlGaAs quantum wires with nominal lengths l=0 and 2 mu m, fabricated from structures free of the disorder associated with modulation doping. In a direct comparison we observe structure near 0.7 X 2e^2/h for l=0 whereas the l=2 mu m wires show structure evolving with increasing electron density to 0.5 X 2e^2/h in zero magnetic field, the value expected for an ideal spin-split sub-band. Our results suggest the dominant mechanism through which electrons interact can be strongly affected by the length of the 1D region.

5 Pages, 4 figures

References in corpus (8)

• Possible Spin Polarization in a One-Dimensional Electron Gas
• Interaction Effects in a One-Dimensional Constriction
• Spin Properties of Low Density One-Dimensional Wires
• Temperature dependence of the ``0.7'' 2(e^2)/h quasi plateau in strongly confined quantum point contacts
• Coulomb Blockade Resonances in Quantum Wires
• Quantum ballistic transport in in-plane-gate transistors showing onset of a novel ferromagnetic phase transition
• Quantum ballistic transport in constrictions of n-PbTe
• Realistic Electron-Electron Interaction in a Quantum Wire

Cited by in corpus (80)

• The Low-Temperature Fate of the 0.7 Structure in a Point Contact: A Kondo-like Correlated State in an Open System
• Conductance of a quantum wire in the Wigner crystal regime
• Density dependent spin polarisation in ultra low-disorder quantum wires
• Conductance of a quantum wire at low electron density
• Local moment formation in quantum point contacts
• Wigner crystal physics in quantum wires
• What lurks below the last plateau: Experimental studies of the 0.7 x 2e^2/h conductance anomaly in one-dimensional systems
• Junction of several weakly interacting quantum wires: a renormalization group study
• Phenomenological model for the 0.7 conductance feature in quantum wires
• Incipient Formation of an Electron Lattice in a Weakly-Confined Quantum Wire
• Shot-Noise Signatures of 0.7 Structure and Spin in a Quantum Point Contact
• Fano factor reduction on the 0.7 structure in a ballistic one-dimensional wire
• Odd and even Kondo effects from emergent localisation in quantum point contacts
• Transition from a one-dimensional to a quasi-one-dimensional state in interacting quantum wires
• Effects of short-range interactions on transport through quantum point contacts: A numerical approach
• Spin-dependent thermoelectric transport coefficients in near-perfect quantum wires
• Ballistic transport in induced one-dimensional hole systems
• Conductance anomalies in a one-dimensional quantum contact
• Filtering and analyzing mobile qubit information via Rashba-Dresselhaus-Aharonov-Bohm interferometers
• Electron-phonon scattering in quantum point contacts
• Transport properties of partially equilibrated quantum wires
• Electron transport through quantum wires and point contacts
• Spin coupling in zigzag Wigner crystals
• Renormalization group study of the conductances of interacting quantum wire systems with different geometries
• Conductance of a quantum point contact based on spin-density-functional theory
• Asymmetric Zero-Bias Anomaly for Strongly Interacting Electrons in One Dimension
• Conductance of fully equilibrated quantum wires
• Resistivity of inhomogeneous quantum wires
• Restricted and unrestricted Hartree-Fock calculations of conductance for a quantum point contact
• Bosonization of strongly interacting electrons
• Exchange Coupling in a One-Dimensional Wigner Crystal
• Transport in partially equilibrated inhomogeneous quantum wires
• Charge transport in a Tomonaga-Luttinger liquid: effects of pumping and bias
• Electronic magnetization of a quantum point contact measured by nuclear magnetic resonance
• Statistical study of conductance properties in one-dimensional quantum wires focussing on the 0.7 anomaly
• On the relation between the 0.7-anomaly and the Kondo effect: Geometric Crossover between a Quantum Point Contact and a Kondo Quantum Dot
• Transport through quasi-ballistic quantum wires: the role of contacts
• Conductance quantization in etched Si/SiGe quantum point contacts
• Extreme sensitivity of the spin-splitting and 0.7 anomaly to confining potential in one-dimensional nanoelectronic devices
• Equilibration of Luttinger liquid and conductance of quantum wires
• Quantum phase transition in quantum wires controlled by an external gate
• Suppression of Shot Noise in Quantum Point Contacts in the "0.7" Regime
• Length-Dependent Conductance of a Spin-Incoherent Hubbard chain; Monte Carlo Calculations
• Interference as a Probe of Spin Incoherence in Strongly Interacting Quantum Wires
• On the Magnetic Nature of Quantum Point Contacts
• Electronic transport in inhomogeneous quantum wires
• Conductance of quantum wires: a numerical study of the effects of an impurity and interactions
• Quantum point contact with large localized spin: fractional quantization of the ballistic conductance
• Dependence of the 0.7 anomaly on the curvature of the potential barrier in quantum wires
• Quantum LC circuits with charge discreteness: normal and anomalous spectrum
• Shot noise free conductance reduction in quantum wires
• Conductance of Tomonaga-Luttinger liquid wires and junctions with resistances
• Ground state structure and conductivity of quantum wires of infinite length and finite width
• The effect of split gate size on the electrostatic potential and 0.7 anomaly within one-dimensional quantum wires on a modulation doped GaAs/AlGaAs heterostructure
• Fractional quantization of ballistic conductance in 1D hole systems
• Conductance through contact barriers of a finite length quantum wire
• Magnetic Moment Formation in Quantum Point Contacts
• Temperature Dependent Suppression of Conductance in Quantum Wires: Anomalous Activation Energy from Pinning of the Band Edge
• Thermal transport and quench relaxation in nonlinear Luttinger liquids
• Kaluza-Klein theory of electron-plasmon interaction in a thin cylindrical wire
• Cylindrical surface plasmon mode coupling as a three-dimensional Kaluza- Klein theory
• Magnetic Field Inducing Zeeman Splitting and Anomalous Conductance Reduction of Half-integer Quantized Plateaus in InAs Quantum Wires
• Phenomenology of the 0.7 conductance feature
• Electron transmission through a short interacting wire: 0.7 conductance anomaly
• Non-adiabatic single-electron pump in a dopant-free GaAs/AlGaAs 2DEG
• Valley splitting in a Si/SiGe quantum point contact
• Fabry-Pérot interference in a triple-gated quantum point contact
• Influence of assisted hopping interaction on the linear conductance of quantum dot
• The Effect of Interactions on the Conductance of Graphene Nanoribbons
• Model of resistances in systems of Tomonaga-Luttinger liquid wires
• Influence of Magnetic Moment Formation on the Conductance of Coupled Quantum Wires
• Tunable All Electric Spin Polarizer
• Mesoscopic transport revisited
• Dephasing in a quantum dot coupled to a quantum point contact
• Charge and spin transport in nanoscopic structures with spin-orbit coupling
• Conductance quantization and shot noise of a double-layer quantum point contact
• Nuclear magnetic resonance probes for the Kondo scenario for the 0.7 feature in semiconductor quantum point contact devices
• Electron-electron interaction effects on transport through mesoscopic superconducting hybrid junctions
• 0.7-anomaly and magnetotransport of disordered quantum wires
• Transport in quantum wires