Effects of short-range interactions on transport through quantum point contacts: A numerical approach

Abstract

We study electronic transport through a quantum point contact, where the interaction between the electrons is approximated by a contact potential. Our numerical approach is based on the non-equilibrium Green function technique which is evaluated at Hartree-Fock level. We show that this approach allows us to reproduce relevant features of the so-called "0.7 anomaly" observed in the conductance at low temperatures, including the characteristic features in recent shot noise measurements. This is consistent with a spin-splitting interpretation of the process, and indicates that the "0.7 anomaly" should also be observable in transport experiments with ultracold fermionic atoms.

12 pages, 10 figures

References in corpus (26)

• Shot Noise in Mesoscopic Conductors
• Quantum Transport in Semiconductor Nanostructures
• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Possible Spin Polarization in a One-Dimensional Electron Gas
• Bose-Einstein condensation in quasi2D trapped gases
• 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
• Density dependent spin polarisation in ultra low-disorder quantum wires
• Magnetic impurity formation in quantum point contacts
• Many-body spin related phenomena in ultra-low-disorder quantum wires
• Spontaneous spin polarization in quantum point contacts
• Local moment formation in quantum point contacts
• Ferromagnetic transition and phase diagram of the one-dimensional Hubbard model with next-nearest-neighbor hopping
• Phenomenological model for the 0.7 conductance feature in quantum wires
• 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
• The anomalous 0.5 and 0.7 conductance plateaus in quantum point contacts
• A quantum point contact for neutral atoms
• Aharonov-Bohm Physics with Spin II: Spin-Flip Effects in Two-dimensional Ballistic Systems
• Electron-phonon scattering in quantum point contacts
• Spontaneous Spin Polarization in Quantum Wires
• Suppression of Shot Noise in Quantum Point Contacts in the "0.7" Regime
• Magnetic Moment Formation in Quantum Point Contacts
• Phenomenology of the 0.7 conductance feature

Cited by in corpus (26)

• All-Electric Quantum Point Contact Spin Valve
• What lurks below the last plateau: Experimental studies of the 0.7 x 2e^2/h conductance anomaly in one-dimensional systems
• Electron density and transport in top-gated graphene nanoribbon devices: First-principles Green function algorithms for systems containing large number of atoms
• Optimal block-tridiagonalization of matrices for coherent charge transport
• Possible origin of the 0.5 plateau in the ballistic conductance of quantum point contacts
• Electron-electron interaction effects in quantum point contacts
• Non-Kondo zero-bias anomaly in quantum wires
• Zeeman ratchets: pure spin current generation in mesoscopic conductors with non-uniform magnetic fields
• Conductance Anomaly and Fano Factor Reduction in Quantum Point Contacts
• Gate-modulated thermopower in disordered nanowires: I. Low temperature coherent regime
• Noise of Kondo dot with ac gate: Floquet-Green's function and Noncrossing Approximation Approach
• Fractional quantization of ballistic conductance in 1D hole systems
• Direct observation of non-equilibrium spin population in quasi-one-dimensional nanostructures
• Evidence for Charging Effects in CdTe/CdMgTe Quantum Point Contacts
• Theory of NMR in semiconductor quantum point contact devices
• Detection of interaction-induced nonlocal effects using perfectly transmitting nanostructures
• Dependence of the 0.5(2e2/h) conductance plateau on the aspect ratio of InAs quantum point contacts with in-plane side gates
• Tunable All Electric Spin Polarizer
• Tracking the energies of one-dimensional subband edges in quantum point contacts using dc conductance measurements
• Dephasing in a quantum dot coupled to a quantum point contact
• Chiral Surface Modes in Three-Dimensional Topological Insulators
• Hysteresis in the Conductance of Asymmetrically Biased GaAs Quantum Point Contacts with in-plane Side Gates
• Resonant tunneling-based spin ratchets
• Intrinsic Bistability In Quantum Point Contacts with in-plane Side Gates
• Thermal transport in disordered harmonic chains revisited: Formulation of thermal conductivity and local temperatures
• On-chip quantum sensing of Kondo spins in a high-mobility quasi-one-dimensional nanoconstriction