Effective mass of electrons and holes in bilayer graphene: Electron-hole asymmetry and electron-electron interaction

Effective mass of electrons and holes in bilayer graphene: Electron-hole asymmetryand electron-electron interaction

ELECTRON III: Effective mass theorem, dynamics of electrons and holes

Band structure basically tells us the exact quantum mechanical description of the electrons, and in principle all properties of solids can be calculated from it. The quantum mechanical solution is nothing but the wave functions of the ‘allowed’ electronic eiganstates. So, an electron in an eiganstate will ideally extend throughout the sample. In another words, the electron is everywhere in spac...

Electron-electron and electron-hole pairing in graphene structures.

The superconducting pairing of electrons in doped graphene owing to in-plane and out-of-plane phonons is considered. It is shown that the structure of the order parameter in the valley space substantially affects conditions of the pairing. Electron-hole pairing in a graphene bilayer in the strong coupling regime is also considered. Taking into account retardation of the screened Coulomb pairing...

Chemical doping and electron-hole conduction asymmetry in graphene devices.

We investigate poly(ethylene imine) and diazonium salts as stable, complementary dopants on graphene. Transport in graphene devices doped with these molecules exhibits asymmetry in electron and hole conductance. The conductance of one carrier is preserved, while the conductance of the other carrier decreases. Simulations based on nonequilibrium Green's function formalism suggest that the origin...

Bilayer graphene. Electron-hole asymmetric integer and fractional quantum Hall effect in bilayer graphene.

The nature of fractional quantum Hall (FQH) states is determined by the interplay between the Coulomb interaction and the symmetries of the system. The distinct combination of spin, valley, and orbital degeneracies in bilayer graphene is predicted to produce an unusual and tunable sequence of FQH states. Here, we present local electronic compressibility measurements of the FQH effect in the low...