2002/07/08 by Daniel Miller, Daniel L. Miller, Miller, Daniel L.
Physics and Astronomy · #Condensed Matter (cond-mat) #FOS: Physical sciences #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #Surface and Thin Film Phenomena #cond-mat
paper · pdf · doi:10.48550/arxiv.cond-mat/0207168
figures included
arxiv created 2002/07/08 · openalex publication_date 2002/07/08 · arxiv updated 2009/11/30 · openalex created_date 2022/09/30 · openalex updated_date 2026/07/28
This is a three step work: i) we explain why quantum point contacts are\nsimilar to ballistic quantum dots; ii) we introduce the virtual Kondo state in\nboth systems; iii-1st) this state explains 0.7 structure in point contacts;\niii-2nd) formation of the local moment on this state is described by the nearly\nsymmetric Anderson model, we solve it for finite size system having in mind\nquantum dots. We found one large level spacing \Δ^\∗ \∝\n(U\Γ)1/2\≫ \Δ, where U is the charging energy of the virtual\nstate, \Γ is the spectral width of this state and \Δ is the mean\nlevel spacing of whole system. The theory explains periodicity of abnormal\nlevel spacing vs gate potential. The theory is in agreement with many\nexperiments.\n