Graphene at Very High Magnetic Fields

QUEST Center event
No
Speaker
Ganpathy Murthy, University of Kentucky
Date
05/06/2019 - 15:15Add to Calendar 2019-06-05 15:15:00 2019-06-05 15:15:00 Graphene at Very High Magnetic Fields In the Hofstadter problem, an orbital flux of the order of a flux quantum goes through each unit cell. There are some special features when one considers a honeycomb lattice. For a certain class of hopping problems obeying a nonunitary "chiral " symmetry, when 1/q quanta of flux penetrate each unit cell, the central two bands touch at 2q Dirac points. These touchings are protected by lattice symmetries and the "chiral" symmetry. When simple short-range interactions are introduced, we find a plethora of phases which have charge,  magnetic, and/or bond order. I will compare this to Kharitonov's phase diagram in the continuum limit for tiny fields.   Resnick seminar room - 2nd floor Department of Physics physics.dept@mail.biu.ac.il Asia/Jerusalem public
Place
Resnick seminar room - 2nd floor
Abstract

In the Hofstadter problem, an orbital flux of the order of a flux quantum goes through each unit cell. There are some special features when one considers a honeycomb lattice. For a certain class of hopping problems obeying a nonunitary "chiral " symmetry, when 1/q quanta of flux penetrate each unit cell, the central two bands touch at 2q Dirac points. These touchings are protected by lattice symmetries and the "chiral" symmetry. When simple short-range interactions are introduced, we find a plethora of phases which have charge,  magnetic, and/or bond order. I will compare this to Kharitonov's phase diagram in the continuum limit for tiny fields.  

Last Updated Date : 03/06/2019