Non-Kondo zero-bias anomaly in quantum wires

Abstract

It has been suggested that a zero-bias conductance peak in quantum wires signifies the presence of Kondo spin-correlations, which might also relate to an intriguing 1D spin-effect known as the 0.7 structure. These zero-bias anomalies (ZBA) are strongly temperature dependent, and have been observed to split into two peaks in magnetic field, both signatures of Kondo correlations in quantum dots. We present data in which ZBAs in general do not split as magnetic field is increased up to 10 T. A few of our ZBAs split in magnetic field but by significantly less than the Kondo splitting value, and evolve back to a single peak upon moving the 1D constriction laterally. The ZBA therefore does not appear to have a Kondo origin, and instead we propose a simple phenomenological model to reproduce the ZBA which is in agreement mostly with observed characteristics.

5 pages, 4 figures; the first two authors contributed equally to this work

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Cited by in corpus (14)

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• Odd and even Kondo effects from emergent localisation in quantum point contacts
• On the Zero-Bias Anomaly in Quantum Wires
• Possible origin of the 0.5 plateau in the ballistic conductance of quantum point contacts
• Observation of the Kondo Effect in a Spin-3/2 Hole Quantum Dot
• Zero-bias Anomaly of Quantum Point Contacts in the Low-Conductance Limit
• Extreme sensitivity of the spin-splitting and 0.7 anomaly to confining potential in one-dimensional nanoelectronic devices
• A new view on the origin of zero-bias anomalies of Co atoms atop noble metal surfaces
• Origins of conductance anomalies in a p-type GaAs quantum point contact
• Noise of Kondo dot with ac gate: Floquet-Green's function and Noncrossing Approximation Approach
• Anomalous excitations of atomically crafted quantum magnets
• Nuclear Polarization in Quantum Point Contacts in an In-Plane Magnetic Field
• Magnetic Splitting of the Zero Bias Peak in a Quantum Point Contact with a Variable Aspect Ratio
• The 0.7 anomaly in quantum point contact; many-body or single-electron effect?