Chiral transport of hot carriers in graphene in the quantum Hall regime
arXiv:2110.01079 · doi:10.1021/acsnano.2c05502
Abstract
Photocurrent (PC) measurements can reveal the relaxation dynamics of photo-excited hot carriers beyond the linear response of conventional transport experiments, a regime important for carrier multiplication. In graphene subject to a magnetic field, PC measurements are able to probe the existence of Landau levels with different edge chiralities which is exclusive to relativistic electron systems. Here, we report the accurate measurement of PC in graphene in the quantum Hall regime. Prominent PC oscillations as a function of gate voltage on samples' edges are observed. These oscillation amplitudes form an envelope which depends on the strength of the magnetic field, as does the PCs' power dependence and their saturation behavior. We explain these experimental observations through a model using optical Bloch equations, incorporating relaxations through acoustic-, optical- phonons and Coulomb interactions. The simulated PC agrees with our experimental results, leading to a unified understanding of the chiral PC in graphene at various magnetic field strengths, and providing hints for the occurrence of a sizable carrier multiplication.
14 pages, 13 figures
References in corpus (22)
- The Raman Fingerprint of Graphene
- Landau Level Splitting in Graphene in High Magnetic Fields
- Detecting Topological Currents in Graphene Superlattices
- Photo-excitation Cascade and Multiple Carrier Generation in Graphene
- Spin Filtered Edge States and Quantum Hall Effect in Graphene
- Strongly Correlated Chern Insulators in Magic-Angle Twisted Bilayer Graphene
- Giant Nonlocality near the Dirac Point in Graphene
- Quantized Transport in Graphene p-n Junctions in Magnetic Field
- Dissipative Quantum Hall Effect in Graphene near the Dirac Point
- Hot carriers in graphene -- fundamentals and applications
- Photo-excited Carrier Dynamics and Impact Excitation Cascade in Graphene
- Josephson-junction infrared single-photon detector
- Charge and Spin Transport at the Quantum Hall Edge of Graphene
- Pseudo-magnetic field-induced ultra-slow carrier dynamics in periodically strained graphene
- Long-range nontopological edge currents in charge-neutral graphene
- Carrier multiplication in graphene under Landau quantization
- Experimental determination of the energy per particle in partially filled Landau levels
- Edge Channels of Broken-Symmetry Quantum Hall States in Graphene probed by Atomic Force Microscopy
- Accurate Measurement of the Gap of Graphene/hBN Moiré Superlattice through Photocurrent Spectroscopy
- Optical flux pump in the quantum Hall regime
- Observation of chiral photocurrent transport in the quantum Hall regime in graphene
- Giant intrinsic photoresponse in pristine graphene