Physics of Arbitrary Doped Kondo Lattices: from a Commensurate Insulator to a Heavy Luttinger Liquid and a Protected Helical Metal
arXiv:1812.11507 · doi:10.1103/PhysRevB.100.165110
Abstract
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 róle 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 first-ever comprehensive analytical theory of such KL at an arbitrary doping and predict a variety of regimes with different electronic phases. They range from commensurate insulators (at filling factors 1/2, 1/4 and 3/4) to metals with strongly interacting conduction electrons (close to these three special cases) to an exotic phase of a helical metal. The helical metals can provide a unique platform for realization of an emergent protection of ballistic transport in quantum wires. We compare out theory with previously obtained numerical results and discuss possible experiments where the theory could be tested.
v.2 has been substantially re-written: 9+7 pages, 3 figures; this paper is complementary to the preprint arXiv:1902.01787 and is focused mainly on the phase diagram of the 1D dense Kondo Lattice
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Cited by in corpus (11)
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- Matrix Product Study of Spin Fractionalization in the 1D Kondo Insulator
- Universal conductance dips and fractional excitations in a two-subband quantum wire
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