Pseudo electric field and pumping valley current in graphene nanobubbles

Naif Hadadi (1) , Adel Belayadi (2) , Ahmed Alrabiah (1, 3) , Ousmane Ly (4) , Collins Ashu Akosa (5) , Michael Vogl (1) , Hocine Bahlouli (1) , Aurelien Manchon (6) , Adel Abbout (1)

1 KFUPM - King Fahd University of Petroleum and Minerals
2 USTHB - Université des Sciences et de la Technologie Houari Boumediene = University of Sciences and Technology Houari Boumediene [Alger]
3 Northwestern University [Evanston]
4 UNA - Université de Nouakchott Al-Aasriya
5 Waseda University [Tokyo, Japan]
6 CINaM - Centre Interdisciplinaire de Nanoscience de Marseille

The extremely high pseudo-magnetic field emerging in strained graphene suggests that an oscillating nano-deformation will induce a very high current even without electric bias. In this paper, we demonstrate the sub-terahertz (THz) dynamics of a valley-current and the corresponding charge pumping with a periodically excited nano-bubble. We discuss the amplitude of the pseudo-electric field and investigate the dependence of the pumped valley current on the different parameters of the system. Finally, we report the signature of extraharmonics generation in the valley current that might lead to potential modern devices development operating in the nonlinear regime.

Domaines: Matière Condensée [cond-mat]; Science des matériaux [cond-mat.mtrl-sci]

Naif Hadadi, Adel Belayadi, Ahmed Alrabiah, Ousmane Ly, Collins Ashu Akosa, et al.. Pseudo electric field and pumping valley current in graphene nanobubbles. Physical Review B, 2023, 108 (19), pp.195418. ⟨10.1103/PhysRevB.108.195418⟩. ⟨hal-04364031⟩