|Emergent Bloch Excitations in Mott Matter|
Location：Room 616,Physics Building
We develop a unified theoretical picture for excitations in Mott systems, portraying both the heavy quasiparticle excitations and the Hubbard bands as features of an emergent Fermi liquid state formed in an extended Hilbert space, which is non-perturbatively connected to the physical system. This observation sheds light on the fact that even the incoherent excitations in strongly correlated matter often display a well defined Bloch character, with pronounced momentum dispersion. Furthermore,it indicates that the Mott point can be viewed as a topological transition, where the number of distinct dispersing bands displays a sudden change at the critical point. Our results, obtained from an appropriate variational principle, show remarkable quantitative agreement with available numerically-exact approaches. This opens an exciting avenue for fast realistic modeling of strongly correlated materials.
Reference: Lanata et. al, arXiv:1701.05444 (2017)
Nicola Lanatà obtained his PhD in “Theory and Numerical Simulation in Condensed Matter Systems” at the International School for Advanced Studies (SISSA-ISAS) (Italy) in October 2009, under the supervision of Prof. Michele Fabrizio. He subsequently worked for two years as a postdoc at the Gothenburg University (Sweden), and for another three years at Rutgers University (USA), under the supervision of Prof. Gabriel Kotliar. In September 2015, he joined the National High Magnetic Field Laboratory (MagLab) as a Dirac Postdoctoral Fellow. His research activity has been mainly concerned with the physics of Strongly Correlated Materials, Materials Science and the development of new theoretical and computational methods, including an open-source code for which he was awarded the “Ames Laboratory Patent Award” in March 2014.