Swagata Acharya

Feasibility of a metamagnetic transition in correlated systems.

The long-standing issue of the competition between the magnetic field and the Kondo effect, favoring, respectively, triplet and singlet ground states, is addressed using a cluster slave-rotor mean-field theory for the Hubbard model and its spin-correlated, spin-frustrated extensions in two dimensions. The metamagnetic jump is established and compared with earlier results of dynamical mean-field theory. This approach also reproduces the emergent super-exchange energy scale in the insulating side. A scaling is found for the critical Zeeman field in terms of the intrinsic coherence scale just below the metal-insulator transition, where the critical spin fluctuations are soft. The conditions required for metamagnetism to appear at a reasonable field are also underlined. Gutzwiller analysis on the two-dimensional Hubbard model and a quantum Monte Carlo calculation on the Heisenberg spin system are performed to check the limiting cases of the cluster slave-rotor results for the Hubbard model. Low-field scaling features for magnetization are discussed.

Quantum criticality associated with dimensional crossover in the iso-electronic series Ca_{2-x}Sr_{x}RuO_{4}

The iso-electronic

A DMFT+CTQMC Investigation of Strange Metallicity in Local Quantum Critical Scenario

d^{4}

Self-energies in itinerant magnets: A focus on Fe and Ni

compounds of the

Self-assembly of correlated Kondo lattices: The Mott to Kondo transition in diluted superlattices.

4d

Emergent Strange Nodal Metallicity from Orbital-Selective Mott Physics.

series show rich phase diagrams due to competing spin, charge and orbital degrees of freedom in presence of strong correlations and structural distortions. One such iso-electronic series,

Metal-Insulator Transition in Copper Oxides Induced by Apex Displacements

Ca_{2-x}Sr_{x}RuO_{4}

Metal-insulator transition and enhanced superconducting pairing fluctuation in copper oxides induced by apex displacements

, is studied within the GGA (and spin-orbit coupled GGA) plus DMFT formalism using the hybridization expansion of continuous time Quantum Monte Carlo solver. While the local dynamical correlations make

Driving the tri-layer Nickelates to the proximity of a quantum critical point and superconductivity.

Sr_{2}RuO_{4}

Spin Nematic Phase in Iron-Oxychalcogenide Mott Insulators

a Hunds metal, they drive