210 citations · 2.2k across the 74 of their papers we have counts for
73 papers
Tuneable terahertz transitions in zigzag graphene nanoribbons
R. R. Hartmann, M. E. Portnoi
We show that a transverse electric field applied to a zigzag graphene nanoribbon opens a band gap whose energy can be tuned through the terahertz (THz) range. The field breaks the…
Designer gapped and tilted Dirac cones in lateral graphene superlattices
A. Wild, R. R. Hartmann, E. Mariani +1
We show that a planar array of bipolar waveguides in graphene can be used to engineer gapped and tilted two-dimensional Dirac cones within the electronic band structure. The presen…
Valley separation of photoexcited carriers in bilayer graphene
T. J. Osborne, M. E. Portnoi, E. Mariani
We derive the angular generation density of photoexcited carriers in gapless and gapped Bernal bilayer graphene. Exploiting the strong anisotropy of the band structure of bilayer g…
Bipolar electron waveguides in two-dimensional materials with tilted Dirac cones
R. R. Hartmann, M. E. Portnoi
We show that the (2+1)-dimensional massless Dirac equation, which includes a tilt term, can be reduced to the biconfluent Heun equation for a broad range of scalar confining potent…
Failure of the Mott's formula for the Thermopower in Carbon Nanotubes
A. V. Kavokin, M. E. Portnoi, A. A. Varlamov +1
Well-known Mott's formula links the thermoelectric power characterised by Seebeck coefficient to conductivity. We calculate analytically the thermoelectric current and Seebeck coef…
Quantum confinement in Dirac-like nanostructures
C. A. Downing, M. E. Portnoi
In Westminster Abbey, in a nave near to Newton's monument, lies a memorial stone to Paul Dirac. The inscription on the stone includes the relativistic wave equation for an electron…