|Location||IFW Dresden D2E.27|
|Topic||Non-linear and anomalous planar Hall effect in Dirac materials|
It has been recently established that Hall-like transverse currents can appear as a second-order response to an external electric field in a wide class of time-reversal symmetric and inversion-symmetry broken materials . This non-linear Hall effect possesses a quantum contribution directly arising from the dipole moment of the Berry curvature, and has been recently observed in two-dimensional materials with strong spin-orbit coupling where the low-energy Dirac quasiparticles form tilted Dirac cones. In this talk I will show that this topological effect can appear even in the complete absence of spin-orbit coupling . In these systems, it is the warping of the Fermi surface that triggers sizeable Berry curvature dipoles. As a prominent example, I will show that uniaxially strained bilayer graphene with gate-induced band gaps is characterized by dipoles comparable in strength to those observed in bilayer transition metal dichalcogenides . In the second part of the talk, I will show that the Berry curvature in two-dimensional trigonal crystals can yield an anomalous planar Hall effect  producing a transverse current even in a configuration where the driving electric field is aligned with the external magnetic field.
 C. Ortix Advanced Quantum Technologies 2100056 (2021).
 R. Battilomo, N. Scopigno, C. Ortix, Physical Review Letters 123, 196403 (2019).
 S.-C. Ho, ….., C. Ortix, T.-M. Chen, Nature Electronics 4, 116 (2021).
 R. Battilomo, N. Scopigno, C. Ortix, Physical Review Research 3, L012006 (2021).
|Invited by||Prof. Dr. Jeroen van den Brink|