Magnetic-barrier-induced conductance fluctuations in quantum wires

2008/05/31 by Stefan Hugger, S. Hugger, Hengyi Xu +9 · 8 citations
Physics and Astronomy · #Amplitude #Condensed matter physics #Conductance #Magnetic field #Physics #Quantum #Quantum and electron transport phenomena #Quantum mechanics #Scattering #Semiconductor Quantum Structures and Devices #Surface and Thin Film Phenomena #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.78.165307

published in Physical Review B 78(16) (American Physical Society) · 4 pages, 4 figures

arxiv created 2008/09/19 · openalex publication_date 2008/10/06 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Quasiballistic semiconductor quantum wires are exposed to localized perpendicular magnetic fields, also known as magnetic barriers. Pronounced, reproducible conductance fluctuations as a function of the magnetic barrier amplitude are observed. The fluctuations are strongly temperature dependent and remain visible up to temperatures of \ensuremath≈10 K. Simulations based on recursive Green's functions suggest that the conductance fluctuations originate from parametric interferences of the electronic wave functions, which experience scattering between the magnetic barrier and the electrostatic potential landscape.

Citations

• Self-consistent simulation of quantum wires defined by local oxidation of Ga(Al)As heterostructures
• Magnetic Confinement of Massless Dirac Fermions in Graphene
• Transport in a two-dimensional electron-gas narrow channel with a magnetic-field gradient
• Conductance and conductance fluctuations of narrow disordered quantum wires