Graphene Quantum Dots Probed by Scanning Tunneling Microscopy

Resonant tunneling in graphene pseudomagnetic quantum dots.

Realistic relaxed configurations of triaxially strained graphene quantum dots are obtained from unbiased atomistic mechanical simulations. The local electronic structure and quantum transport characteristics of y-junctions based on such dots are studied, revealing that the quasi-uniform pseudomagnetic field induced by strain restricts transport to Landau level- and edge state-assisted resonant ...

Generalized effective mass theory of sub-surface scanning tunneling microscopy: application to cleaved quantum dots

An effective mass theory of sub-surface STM is developed. Sub-surface structures such as quantum dots embedded into a semiconductor slab are considered. States localised around sub-surface structures match on to a tail that decays into the vacuum above the surface. It is shown that the lateral variation of this tail may be found from a surface envelope function provided that the effects of the ...

Graphene Manipulation on 4H-SiC(0001) Using Scanning Tunneling Microscopy

Atomic-scale topography of epitaxial multilayer graphene grown on 4H-SiC(0001) was investigated using scanning tunneling microscopy (STM). Bunched nano-ridges ten times smaller than previously recorded were observed throughout the surface, the morphology of which was systematically altered using a relatively new technique called electrostatic-manipulation scanning tunneling microscopy. Transfor...

Bias asymmetry in the conductance profile of magnetic ions on surfaces probed by scanning tunneling microscopy

The conductance profiles of magnetic transition-metal atoms, such as Fe, Co, and Mn, deposited on surfaces and probed by a scanning tunneling microscope (STM), provide detailed information on the magnetic excitations of such nanomagnets. In general, the profiles are symmetric with respect to the applied bias. However, a set of recent experiments has shown evidence for inherent asymmetries when ...

Microscopy, Scanning Tunneling