2 papers
cond-mat.mes-hall2024
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…
cond-mat.mes-hall2023
Stark effect tunable terahertz transitions in finite carbon chains
R. A. Ng, M. E. Portnoi, R. R. Hartmann
We employ a tight-binding model to calculate the optical selection rules of gold-terminated carbyne chains in the presence of an applied electric field. We show that both the magni…