11 April 2024 Thu 4 pm

Electron wave function in solids can change electron's trajectory in a non-trivial way. The chief example is the Berry curvature that leads to anomalous electron velocity. In this talk, we will explore several phenomena of such effects in optoelectronics and transport. Firstly, spatial gap inversion induces topological boundary states in bilayer graphene. We investigate the collective motion (plasmons) of the topological states [1]. Next, we show non-trivial optical responses of anomalous Hall materials such as cyclotron motion without magnetic field and dynamical Hall currents without breaking time reversal symmetry [2,3]. Finally, I will talk about the effect of wave functions in electron hydrodynamics [4,5].

[1] EHH & JCW Song, Long-lived domain wall plasmons in gapped bilayer graphene, Nano Letters 17, 7252 (2017).

[2] EHH, AJ Frenzel, JCW Song, Cyclotron motion without magnetic field, New Journal of Physics 21, 083026 (2019).

[3] JM Adhidewata, RWM Komalig, MS Ukhtary, ART Nugraha, BE Gunara, EHH, Trigonal warping effects on optical properties of anomalous Hall materials, Physical Review B 107, 155415 (2023).

[4] EHH, J Ekström, EG Idrisov, TL Schmidt, Electron hydrodynamics of two-dimensional anomalous Hall materials Physical Review B 103, 125106 (2021).

[5] EG Idrisov, EHH, BN Radhakrishnan, TL Schmidt, Hydrodynamic Navier-Stokes equations in two-dimensional systems with Rashba spin-orbit coupling, Low Temperature Physics 49, 1385 (2023).

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