Tunable 0.7 conductance plateau in quantum dots

Abstract

A consistent approach in forming the 0.7 structure by using a quantum dot rather than a quantum point contact is demonstrated. With this scheme, it was possible to tune on and off the 0.7 structure. The 0.7 structure continuously evolved into a normal integer conductance plateau by varying the tuning condition. Unlike the conventional 0.7 plateau, the new 0.7 structure was observed even at low electron temperatures down to 100 mK, with unprecedented flatness. From our results, it is concluded that electron interference should be taken into consideration to explain the 0.7 structure.

References in corpus (12)

• Kondo Physics in a Single Electron Transistor
• 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
• Kondo model for the "0.7 anomaly" in transport through a quantum point contact
• Density dependent spin polarisation in ultra low-disorder quantum wires
• Spontaneous spin polarization in quantum point contacts
• Spin Properties of Low Density One-Dimensional Wires
• Fano factor reduction on the 0.7 structure in a ballistic one-dimensional wire
• Spin-dependent transport in a quasiballistic quantum wire
• Electron transport through quantum wires and point contacts
• Multiple Particle Scattering in Quantum Point Contacts
• Anomalous spin-dependent behaviour of one-dimensional subbands

Cited by in corpus (5)

• Possible origin of the 0.5 plateau in the ballistic conductance of quantum point contacts
• On the relation between the 0.7-anomaly and the Kondo effect: Geometric Crossover between a Quantum Point Contact and a Kondo Quantum Dot
• Spin fluctuations in the 0.7-anomaly in quantum point contacts
• Conductance Anomaly and Fano Factor Reduction in Quantum Point Contacts
• Finite shot noise and electron heating at quantized conductance in high-mobility quantum point contacts