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5 papers · 2 filters
Non-perturbative stochastic method for driven spin-boson model
Peter P. Orth, Adilet Imambekov, Karyn Le Hur
We introduce and apply a numerically exact method for investigating the real-time dissipative dynamics of quantum impurities embedded in a macroscopic environment beyond the weak-c…
Hall effect in heavy-fermion metals
Sunil Nair, S. Wirth, S. Friedemann +3
The heavy fermion systems present a unique platform in which strong electronic correlations give rise to a host of novel, and often competing, electronic and magnetic ground states…
Orbital-selective Mott Phase in Multiorbital Models for Alkaline Iron Selenides K(1-x)Fe(2-y)Se2
Rong Yu, Qimiao Si
We study a multiorbital model for the alkaline iron selenides K(1-x)Fe(2-y)Se2 using a slave-spin method. With or without ordered vacancies, we identify a metal-to-Mott-insulator t…
β-YbAlB4: a critical nodal metal
Aline Ramires, Piers Coleman, Andriy H. Nevidomskyy +1
We propose a model for the intrinsic quantum criticality of β-YbAlB4, in which a vortex in momentum space gives rise to a new type of Fermi surface singularity. The unquenched angu…
U(1) Slave-spin theory and its application to Mott transition in a multi-orbital model for iron pnictides
Rong Yu, Qimiao Si
A U(1) slave-spin representation is introduced for multi-orbital Hubbard models. As with the form of L. de'Medici et al. (Phys. Rev. B 72, 205124 (2005)), this approach repre…