99 citations · 267 across the 15 of their papers we have counts for
8 papers · 1 filter
Heavy antiferromagnetic phases in Kondo lattices
L. Isaev, I. Vekhter
We propose a microscopic physical mechanism that stabilizes coexistence of the Kondo effect and antiferromagnetism in heavy-fermion systems. We consider a two-dimensional quantum K…
Frustrated magnets and quantum paramagnetic phases at finite temperature
L. Isaev, G. Ortiz
We develop a general framework, which combines exact diagonalization in small clusters with a density matrix variational principle, to study frustrated magnets at finite temperatur…
Comment on "Quantum phase transition in the four-spin exchange antiferromagnet" by V. N. Kotov, D.-X. Yao, A. H. Castro-Neto, and D. K. Campbell
L. Isaev, G. Ortiz, J. Dukelsky
In a recent paper [Phys. Rev. {\bf B80}, 174403 (2009)] Kotov {\it et al.} studied the paramagnetic-to-antiferromagnetic transition in the - model. Their findings were claime…
Local physics of magnetization plateaux in the Shastry-Sutherland model
L. Isaev, G. Ortiz, J. Dukelsky
We address the physical mechanism responsible for the emergence of magnetization plateaux in the Shastry-Sutherland model. By using a hierarchical mean-field approach we demonstrat…
Phase diagram of the Heisenberg antiferromagnet with four-spin interactions
L. Isaev, G. Ortiz, J. Dukelsky
We study the quantum phase diagram of the Heisenberg planar antiferromagnet with a subset of four-spin ring exchange interactions, using the recently proposed heirarchical mean-fie…
Hierarchical mean-field approach to the - Heisenberg model on a square lattice
L. Isaev, G. Ortiz, J. Dukelsky
We study the quantum phase diagram and excitation spectrum of the frustrated - spin-1/2 Heisenberg Hamiltonian. A hierarchical mean-field approach, at the heart of which…