Statistical study of conductance properties in one-dimensional quantum wires focussing on the 0.7 anomaly

Abstract

The properties of conductance in one-dimensional (1D) quantum wires are statistically investigated using an array of 256 lithographically-identical split gates, fabricated on a GaAs/AlGaAs heterostructure. All the split gates are measured during a single cooldown under the same conditions. Electron many-body effects give rise to an anomalous feature in the conductance of a one-dimensional quantum wire, known as the `0.7 structure' (or `0.7 anomaly'). To handle the large data set, a method of automatically estimating the conductance value of the 0.7 structure is developed. Large differences are observed in the strength and value of the 0.7 structure [from $0.63$ to $0.84\times (2e^2/h)$], despite the constant temperature and identical device design. Variations in the 1D potential profile are quantified by estimating the curvature of the barrier in the direction of electron transport, following a saddle-point model. The 0.7 structure appears to be highly sensitive to the specific confining potential within individual devices.

References in corpus (19)

• 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
• Magnetic impurity formation in quantum point contacts
• Many-body spin related phenomena in ultra-low-disorder quantum wires
• Local moment 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
• Spin Properties of Low Density One-Dimensional Wires
• Phenomenological model for the 0.7 conductance feature in quantum wires
• Odd and even Kondo effects from emergent localisation in quantum point contacts
• Cryogenic on-chip multiplexer for the study of quantum transport in 256 split-gate devices
• On the Zero-Bias Anomaly in Quantum Wires
• Electron-electron interaction effects in quantum point contacts
• The Impact of Small-Angle Scattering on Ballistic Transport in Quantum Dots
• Resonant transmission through an open quantum dot
• Extreme sensitivity of the spin-splitting and 0.7 anomaly to confining potential in one-dimensional nanoelectronic devices
• Using a tunable quantum wire to measure the large out-of-plane spin splitting of quasi two-dimensional holes in a GaAs nanostructure

Cited by in corpus (7)

• On the relation between the 0.7-anomaly and the Kondo effect: Geometric Crossover between a Quantum Point Contact and a Kondo Quantum Dot
• Dependence of the 0.7 anomaly on the curvature of the potential barrier in quantum wires
• 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
• Cryogenic Multiplexing with Bottom-Up Nanowires
• Improving reproducibility of quantum devices with completely undoped architectures
• Dependence of the 0.5(2e2/h) conductance plateau on the aspect ratio of InAs quantum point contacts with in-plane side gates
• Statistical Reproducibility of Selective Area Grown InAs Nanowire Devices