Theoretical Nanophysics

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Incommensurate 2kF density wave quantum critical points in two dimensional metals

Johannes Halbinger

16.02.2019 at 14:00 

We study one-dimensional Kondo Lattices (KL) which consist of itinerant electrons interacting with Kondo impurities (KI) - localized quantum magnetic moments. We focus on KL with isotropic exchange interaction between electrons and KI and with a high KI density. The latter determines the principal role of the indirect interaction between KI for the low
energy physics. Namely, the Kondo physics becomes suppressed and all properties are governed by spin ordering. We present a rst-ever comprehensive analytical theory of such KL at an arbitrary doping and predict a variety of regimes with dierent electronic phases. They range from a commensurate insulators (at lling factors 1/2, 1/4 and 3/4) to the strongly interacting electrons (close to these three special cases) and to an exotic phase of a helical metal. The latter can provide a unique platform for realization of an emergent protection of ballistic transport in the spin-rotation invariant system. Finally we compare out theory with previously obtained numerical results and discuss possible experiments where the theory could be tested.

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