The power of vortices – dual perspectives on exotic quantum phases

QUEST Center event
No
Speaker
David Mross (Weizmann)
Date
25/10/2018 - 16:30 - 15:30Add to Calendar 2018-10-25 15:30:00 2018-10-25 16:30:00 The power of vortices – dual perspectives on exotic quantum phases The analysis of topological excitations in interacting many-body systems often provides important insights into quantum phases and phase transitions. Seminal examples are the (thermal) BKT transition as well as the (quantum) superfluid-Mott insulator transition, which are naturally described in terms of vortices. More recently, such a ‘dual’ formulation has proven extremely illuminating in the study of exotic phases of matter that host fractional excitations, e.g., in topological phases and quantum magnets. In my talk, I will review the dual description of conventional phases of matter and explain how exotic, fractionalized phases are captured within this approach. I will then generalize these dualities to fermionic systems, and discuss the implications for the half-filled Landau level and strongly interacting surfaces of topological insulators. Finally, I will describe how two-dimensional Dirac fermions (and their symmetries) can be mapped onto interacting bosons. Resnick (#209) - room 210 המחלקה לפיזיקה physics.dept@mail.biu.ac.il Asia/Jerusalem public
Place
Resnick (#209) - room 210
Abstract

The analysis of topological excitations in interacting many-body systems often provides important insights into quantum phases and phase transitions. Seminal examples are the (thermal) BKT transition as well as the (quantum) superfluid-Mott insulator transition, which are naturally described in terms of vortices. More recently, such a ‘dual’ formulation has proven extremely illuminating in the study of exotic phases of matter that host fractional excitations, e.g., in topological phases and quantum magnets. In my talk, I will review the dual description of conventional phases of matter and explain how exotic, fractionalized phases are captured within this approach. I will then generalize these dualities to fermionic systems, and discuss the implications for the half-filled Landau level and strongly interacting surfaces of topological insulators. Finally, I will describe how two-dimensional Dirac fermions (and their symmetries) can be mapped onto interacting bosons.

תאריך עדכון אחרון : 17/10/2018