The Ising-Anisotropic Kondo Lattice in a transverse field: EDMFT study and implications for the global phase diagram

Heavy-fermion materials exhibit a rich variety of phase transitions. Of particular interest are quantum phase transitions and the associated breakdown of the Fermi liquid picture. A theoretical example of this is the Kondo destruction effect in the context of local quantum criticality [1]. To capture this effect and others, a zero-temperature global phase diagram for heavy-fermion materials has been proposed [1]. It incorporates the competition between the Kondo effect (promoted by exchange coupling $J_K$) and the variable quantum fluctuations of the local-moment magnetism (parameterized by $G$). We investigate this competition in the Ising-anisotropic Kondo lattice with a transverse magnetic field, where the field serves to tune $G$. We determine a zero-temperature phase diagram of this model within the extended dynamical mean-field theory (EDMFT), and discuss the implications of our results for the global phase diagram of heavy-fermion systems. \\[4pt] [1] Q. Si et al., J. Phys. Soc. Jpn. \textbf{83}, 061005 (2014).