Ferromagnetically coupled magnetic impurities in a quantum point contact

Abstract

We investigate the ground and excited states of interacting electrons in a quantum point contact using exact diagonalization method. We find that strongly localized states in the point contact appear when a new conductance channel opens due to momentum mismatch. These localized states form magnetic impurity states which are stable in a finite regime of chemical potential and excitation energy. Interestingly, these magnetic impurities have ferromagnetic coupling, which shed light on the experimentally observed puzzling coexistence of Kondo correlation and spin filtering in a quantum point contact.

References in corpus (2)

• Magnetic impurity formation in quantum point contacts
• Localization in an Inhomogeneous Quantum Wire

Cited by in corpus (7)

• What lurks below the last plateau: Experimental studies of the 0.7 x 2e^2/h conductance anomaly in one-dimensional systems
• Evidence for the Formation of Quasi-Bound-State in an Asymmetrical Quantum Point Contact
• Tuning the Fano Resonance with an Intruder Continuum
• Evidence for Charging Effects in CdTe/CdMgTe Quantum Point Contacts
• Temperature Modulation of the Transmission Barrier in 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