NCTS (South)


DATE2019-02-25

TIME12:10

PLACER203, 2F, NCTS, NCKU

FIELDQuantum Information Science

SPEAKER Dr. Sheng-Chin Ho(何昇晉) - 成功大學物理系

TITLEZero-magnetic-field anomalous Hall effect in strained graphene systems

ABSTRACTGraphene systems have received growing attention as it can manifest itself in insulating, metallic, and even superconducting states by the band structure engineering. Here, we demonstrate a new approach to create non-trivial band structure from conventional two-dimensional materials such as graphene via patterned lattice deformation. We observe the linear and non-linear Hall effects under time-reversal symmetry in an artificially corrugated graphene system. This strain is engineered to induce pseudo-magnetic fields and break the spatial inversion symmetry, which results in the distorted Dirac cones with Rashba-like valley-orbit coupling and the momentum-space Berry curvature dipole. This new technique provides a unique platform to modify the band structure and warp the Fermi circles in van der Waal materials via patterned mechanical deformation.