20 citations · 136 across the 35 of their papers we have counts for
7 papers · 2 filters
Quantum phase transition in one dimensional extended Kondo lattice model away from half filling
Ki-Seok Kim
We study one dimensional {\it extended} Kondo lattice model, described by the Hamiltonian for conduction electrons away from half filling and the Heisenberg Hamiltonian for l…
Role of non-magnetic disorder in a doped U(1) spin liquid
Ki-Seok Kim
Recently we investigated a role of non-magnetic disorder on the stability of a U(1) spin liquid () [cond-mat/0407151; Phys. Rev. B (R) accepted]. In the present paper we exam…
Role of doped holes in a U(1) spin liquid
Ki-Seok Kim
In the context of the SU(2) slave boson theory we show that condensation of holons can result in the zero mode of a nodal spinon in a single instanton potential. Instanton contribu…
Critical field theory of the Kondo lattice model in two dimensions
Ki-Seok Kim
In the context of the U(1) slave boson theory we derive a critical field theory near the quantum critical point of the Kondo lattice model in two spatial dimensions. First we argue…
Role of non-magnetic disorder on the stability of U(1) spin liquid : A renormalization group study
Ki-Seok Kim
Recently Hermele et. al claimed that the infrared (IR) fixed point of non-compact is stable against instanton excitations in the limit of large flavors of massless Dirac fe…
Deconfined quantum criticality of the O(3) nonlinear model in two spacial dimensions: A renormalization group study
Ki-Seok Kim
We investigate the quantum phase transition of the O(3) nonlinear model {\it without Berry phase} in two spacial dimensions. Utilizing the representation of the nonlin…