Discovery: Self-assembly
of 1/3 monolayer of bromine on Si(111) surface leads to formation of an
anisotropic surface Dirac band, which can be used to excite a tunable THz
plasmon.
Approach: Predictive
first-principles band
structure and plasmon
calculations.
Results
and Significance: We have demonstrated a novel approach to
design substrate-supported 2D materials whose electronic bands are completely
isolated from the underlying substrate bands, so that they behave
electronically like freestanding 2D materials, but are structurally stable. Our
findings ease the way for applications of 2D materials due to the inherent
compatibility with the current semiconductor technology.
