Ultrafast valley polarization in bilayer graphene
arXiv:2007.13480 · doi:10.1063/5.0060138
Abstract
We study theoretically interaction of a bilayer graphene with a circularly polarized ultrafast optical pulse of a single oscillation at an oblique incidence. The normal component of the pulse breaks the inversion symmetry of the system and opens up a dynamical band-gap, due to which a valley-selective population of the conduction band becomes sensitive to the angle of incident of the pulse. We show that the magnitude of the valley polarization can be controlled by the angle of incidence, the amplitude, and the angle of in-plane polarization of the chiral optical pulse. Subsequently, a sequence of a circularly polarized pulse followed by a linearly polarized femtosecond-long pulse can be used to control the valley polarization created by the preceding pulse. Generally, the linearly polarized pulse depolarizes the system. The magnitude of such a depolarization depends on the amplitude, and the in-plane polarization angle of the linearly polarized pulse. Our protocol provides a favorable platform for applications in valleytronics.
arXiv admin note: text overlap with arXiv:2004.09732
References in corpus (19)
- The electronic properties of graphene
- Valley polarization in MoS2 monolayers by optical pumping
- Biased bilayer graphene: semiconductor with a gap tunable by electric field effect
- Unconventional quantum Hall effect and Berry's phase of 2pi in bilayer graphene
- Valley filter and valley valve in graphene
- Gate-induced insulating state in bilayer graphene devices
- Asymmetry gap in the electronic band structure of bilayer graphene
- Manipulating infrared photons using plasmons in transparent graphene superlattices
- Quantum interference and Klein tunneling in graphene heterojunctions
- Valley Dependent Optoelectronics from Inversion Symmetry Breaking
- The electronic properties of bilayer graphene
- Graphene valley filter using a line defect
- Single particle relaxation time versus transport scattering time in a 2D graphene layer
- Valleytronics in merging Dirac cones: All-electric-controlled valley filter, valve and universal reversible logic gate
- Topological resonance and single-optical-cycle valley polarization in gapped graphene
- Efficient generation of extreme terahertz harmonics in 3D Dirac semimetals
- Valley-polarization in biased bilayer graphene using circularly polarized light
- Bilayer graphene in strong ultrafast laser fields
- Single-photon transfer using levitated cavityless optomechanics