Evidence for the Formation of Quasi-Bound-State in an Asymmetrical Quantum Point Contact
arXiv:1007.0150 · doi:10.1103/PhysRevB.85.085305
Abstract
Features below the first conductance plateau in ballistic quantum point contacts (QPCs) are often ascribed to electron interaction and spin effects within the single mode limit. In QPCs with a highly asymmetric geometry, we observe sharp resonance peaks when the point contacts are gated to the single mode regime, and surprisingly, under certain gating conditions, a complete destruction of the 2e^2/h, first quantum plateau. The temperature evolution of the resonances suggest non-Fermi liquid behavior, while the overall nonlinear characterizations reveal features reminiscent of the 0.7 effect. We attribute these unusual behaviors to the formation of a quasi bound state, which is stabilized by a momentum-mismatch accentuated by asymmetry.
5 pages, 5 figures
References in corpus (8)
- Magnetic impurity formation in quantum point contacts
- Incipient Formation of an Electron Lattice in a Weakly-Confined Quantum Wire
- Probing the microscopic structure of bound states in quantum point contacts
- Row coupling in an interacting quasi-one-dimensional quantum wire investigated using transport measurements
- Coherent electronic transport in a multimode quantum channel with Gaussian-type scatterers
- Transport through a quantum ring, a dot and a barrier embedded in a nanowire in magnetic field
- Detector Backaction on the Self-Consistent Bound State in Quantum Point Contacts
- Ferromagnetically coupled magnetic impurities in a quantum point contact
Cited by in corpus (10)
- What lurks below the last plateau: Experimental studies of the 0.7 x 2e^2/h conductance anomaly in one-dimensional systems
- Odd and even Kondo effects from emergent localisation in quantum point contacts
- Many-body effects in a quasi-one-dimensional electron gas
- Extreme sensitivity of the spin-splitting and 0.7 anomaly to confining potential in one-dimensional nanoelectronic devices
- Tuning the Fano Resonance with an Intruder Continuum
- Thermoelectric Scanning Gate Interferometry on a Quantum Point Contact
- Evidence for Charging Effects in CdTe/CdMgTe Quantum Point Contacts
- Detecting weak coupling in mesoscopic systems with a nonequilibrium Fano resonance
- Quasibound States and Evidence for a Spin 1 Kondo Effect in Asymmetric Quantum Point Contacts
- Novel Differential Conductance Oscillations in Asymmetric Quantum Point Contacts