The built-in field helps guide photogenerated holes and electrons towards the graphene sheet and n-silicon, respectively. Although the efficiency of their graphene-on-silicon solar cell is ...

Graphene is many times more conductive than copper thanks, in part, to its two-dimensional structure. In most metals, conductivity is limited by crystal imperfections which cause electrons to ...

but also vortices formed by hole carriers. By applying an electric voltage from below the graphene, they changed the number of free electrons in such a way that the current flow was no longer ...

"Electrons in graphene move as if their 'effective' mass ... The laser light can free electrons to momentarily vacate a desk, or 'hole' as physicists call them. "Light can provide energy to ...

They then monitored its cooling with terahertz laser pulses, which are sensitive to the temperature of the graphene electrons. This technique is called optical pump–terahertz probe (OPTP) spectroscopy ...

In a five-layer graphene/ hexagonal boron nitride (hBN) moire superlattice, electrons (blue ball) interact with each other strongly and behave as if they are broken into fractional charges.

More information: M. Kravtsov et al, Viscous terahertz photoconductivity of hydrodynamic electrons in graphene, Nature Nanotechnology (2024). DOI: 10.1038/s41565-024-01795-y ...

The original bond energy of the detached electrons determines the velocity at which they hit the detector. In this way, the scientists were able to reconstruct the band structure of the graphene.

The slower moving electrons are thus more likely to interact with each other, becoming “strongly correlated”. The technique for measuring the properties of this new twisted graphene is ...