Pseudo-field effects in type-II Weyl semi-metals: design principles and transport probes for over-tilted Weyl cones

  Daniel Sabsovich [1]  ,  Tobias Meng [2]  ,  Raquel Queiroz [3]  ,  Dmitry Pikulin [4]  ,  Roni Ilan [1]  
[1] Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel
[2] Institute of Theoretical Physics, Technische Universitat Dresden, 01062 Dresden, Germany
[3] Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel
[4] Station Q, Microsoft Research, Santa Barbara, California 93106-6105, USA

Weyl semi-metals exhibit low energy excitations in their band structure for which the effective Hamiltonian resembles that of Weyl fermions. In condensed matter, the effective Weyl Hamiltonian can be tilted in momentum space, and when it's over-tilted the system is called a type II Weyl semi-metal. In this talk we describe the response of such a system to a magnetic or axial pseudo-magnetic field. We then predict that due to the nature of the chiral Landau level resulting from either a magnetic or a pseudo-magnetic field, the optical conductivity can be utilized to detect a type II phase in the semi-metal, and deduce the direction of the tilt.