Fabio Lingua — Politecnico di Torino #
Quantum Phase Transitions in mixtures of two identical Bosonic Species #

We investigate the Quantum Phase transitions of two-component bosonic systems within the framework of Quantum 
Monte Carlo simulations. Our work is performed by considering two identical bosonic species in a square lattice 
and half-filling conditions. We study the formation of different quantum phases depending on the interplay 
between species' interactions, showing the presence of demixed Superfluid and demixed Mott insulator phases 
when the interspecies potential becomes greater than the intraspecies repulsion. An interesting relationship 
between the the topography of the demixed regions and the demixed quantum phase has been found, revealing 
interesting scenarios in terms of possible experimental detection. <br/>

We finally reconstruct the corresponding 
phase diagram emphasizing that, for large enough (but finite) intra-species interaction, one can observe the 
presence of the transition from the demixed Mott Insulator to the super-counterflow (SCF) state.