Local moment formation in quantum point contacts

Abstract

Spin-density-functional theory of quantum point contacts (QPCs) reveals the formation of a local moment with a net of one electron spin in the vicinity of the point contact - supporting the recent report of a Kondo effect in a QPC. The hybridization of the local moment to the leads decreases as the QPC becomes longer, while the onsite Coulomb-interaction energy remains almost constant.

10 pages, 3 figures, accepted for publication in Physical Review Letters

References in corpus (11)

• Possible Spin Polarization in a One-Dimensional Electron Gas
• The Low-Temperature Fate of the 0.7 Structure in a Point Contact: A Kondo-like Correlated State in an Open System
• Interaction Effects in a One-Dimensional Constriction
• Kondo model for the "0.7 anomaly" in transport through a quantum point contact
• Bias and temperature dependence of the 0.7 conductance anomaly in Quantum Point Contacts
• Many-body spin related phenomena in ultra-low-disorder quantum wires
• The anomalous 0.5 and 0.7 conductance plateaus in quantum point contacts
• Ferromagnetic correlations in quasi-one-dimensional conducting channels
• Coulomb Blockade Resonances in Quantum Wires
• Possible mechanism of the fractional conductance quantization in a one-dimensional constriction
• Temperature Dependent Suppression of Conductance in Quantum Wires: Anomalous Activation Energy from Pinning of the Band Edge

Cited by in corpus (55)

• Spin-charge separation and localization in one-dimension
• A review of progress in the physics of open quantum systems: theory and experiment
• Magnetic impurity formation in quantum point contacts
• What lurks below the last plateau: Experimental studies of the 0.7 x 2e^2/h conductance anomaly in one-dimensional systems
• Phenomenological model for the 0.7 conductance feature in quantum wires
• 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
• Effects of short-range interactions on transport through quantum point contacts: A numerical approach
• Possible evidence of a spontaneous spin-polarization in mesoscopic 2D electron systems
• Probing the microscopic structure of bound states in quantum point contacts
• Electron transport through quantum wires and point contacts
• Theory of momentum resolved tunneling into a short quantum wire
• Conductance of a quantum point contact based on spin-density-functional theory
• Detection of local-moment formation using the resonant interaction between coupled quantum wires
• Self-consistent calculation of the electron distribution near a Quantum-Point Contact in the integer Quantum Hall Effect
• 0.7 Structure and Zero Bias Anomaly in Ballistic Hole Quantum Wires
• Wigner Crystallization in inhomogeneous one dimensional wires
• Ferromagnetic Spin Coupling as the Origin of 0.7 Anomaly in Quantum Point Contacts
• Statistical study of conductance properties in one-dimensional quantum wires focussing on the 0.7 anomaly
• Evidence for localization and 0.7 anomaly in hole quantum point contacts
• Spin fluctuations in the 0.7-anomaly in quantum point contacts
• Detector Backaction on the Self-Consistent Bound State in Quantum Point Contacts
• Extreme sensitivity of the spin-splitting and 0.7 anomaly to confining potential in one-dimensional nanoelectronic devices
• Conductance quantization in etched Si/SiGe quantum point contacts
• Evidence for the Formation of Quasi-Bound-State in an Asymmetrical Quantum Point Contact
• Conductance Anomaly and Fano Factor Reduction in Quantum Point Contacts
• Tuning the Fano Resonance with an Intruder Continuum
• The theory of the "0.7 anomaly" in quantum point contacts
• Suppression of Shot Noise in Quantum Point Contacts in the "0.7" Regime
• Long-range spin-coherence in a strongly-coupled all electronic dot-cavity system
• Ferromagnetically coupled magnetic impurities in a quantum point contact
• On the Magnetic Nature of Quantum Point Contacts
• Charge rearrangement and screening in a quantum point contact
• Dependence of the 0.7 anomaly on the curvature of the potential barrier in quantum wires
• Functional Renormalization Group Approach for Inhomogeneous One-Dimensional Fermi Systems with Finite-Ranged Interactions
• 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
• Magnetic Moment Formation in Quantum Point Contacts
• Thermoelectric Scanning Gate Interferometry on a Quantum Point Contact
• Evidence for Charging Effects in CdTe/CdMgTe Quantum Point Contacts
• Electron transmission through a short interacting wire: 0.7 conductance anomaly
• Temperature Modulation of the Transmission Barrier in Quantum Point Contacts
• Formation mechanism of bound states in graphene point contacts
• Influence of Magnetic Moment Formation on the Conductance of Coupled Quantum Wires
• Detecting weak coupling in mesoscopic systems with a nonequilibrium Fano resonance
• Dephasing in a quantum dot coupled to a quantum point contact
• 0.4 and 0.7 conductance anomalies in quantum point contacts
• Intersubband Electron Interaction in 1D-2D Junctions
• A Scaling Approach for Interacting Quantum Wires -a Possible Explanation for the 0.7 Anomalous Conductance
• Conductance Phases in Aharonov-Bohm Ring Quantum Dots
• Hysteresis in the Conductance of Asymmetrically Biased GaAs Quantum Point Contacts with in-plane Side Gates
• Nuclear magnetic resonance probes for the Kondo scenario for the 0.7 feature in semiconductor quantum point contact devices
• Mechanism of electron localization in a quantum wire
• Intrinsic Bistability In Quantum Point Contacts with in-plane Side Gates
• Electron Dynamics in a Coupled Quantum Point Contact Structure with a Local Magnetic Moment