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- W2073278322 abstract "The persistent current in a lattice model of a one-dimensional interacting electron system is systematically studied using a complex version of the density matrix renormalization group algorithm and the functional renormalization group method. We mainly focus on the situation where a single impurity is included in the ring penetrated by a magnetic flux. Due to the interplay of the electron-electron interaction and the impurity the persistent current in a system of N lattice sites vanishes faster then 1/N. Only for very large systems and large impurities our results are consistent with the bosonization prediction obtained for an effective field theory. The results from the density matrix renormalization group and the functional renormalization group agree well for interactions as large as the band width, even though as an approximation in the latter method the flow of the two-particle vertex is neglected. This confirms that the functional renormalization group method is a very powerful tool to investigate correlated electron systems. The method will become very useful for the theoretical description of the electronic properties of small conducting ring molecules." @default.
- W2073278322 created "2016-06-24" @default.
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- W2073278322 date "2003-01-15" @default.
- W2073278322 modified "2023-09-24" @default.
- W2073278322 title "Persistent currents in mesoscopic rings: A numerical and renormalization group study" @default.
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- W2073278322 doi "https://doi.org/10.1103/physrevb.67.035106" @default.
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