Interaction-driven capacitance in graphene electron-hole double layer in strong magnetic fields

Enhancement of electron-hole superfluidity in double few-layer graphene

We propose two coupled electron-hole sheets of few-layer graphene as a new nanostructure to observe superfluidity at enhanced densities and enhanced transition temperatures. For ABC stacked few-layer graphene we show that the strongly correlated electron-hole pairing regime is readily accessible experimentally using current technologies. We find for double trilayer and quadlayer graphene sheets...

Orbital-dependent Electron-Hole Interaction in Graphene and Associated Multi-Layer Structures

We develop an orbital-dependent potential to describe electron-hole interaction in materials with structural 2D character, i.e. quasi-2D materials. The modulated orbital-dependent potentials are also constructed with non-local screening, multi-layer screening, and finite gap due to the coupling with substrates. We apply the excitonic Hamiltonian in coordinate-space with developed effective elec...

Superfluorescence from dense electron-hole plasmas in high magnetic fields

Cooperative spontaneous recombination (superfluorescence) of electron-hole plasmas in semiconductors has been a challenge to observe due to ultrafast decoherence. We argue that superfluorescence can be achieved in quantum-confined semiconductor systems and present experimental evidence for superfluorescence from high-density photoexcited electronhole plasmas in magnetized quantum wells. At a cr...

Quantum capacitance measurements of electron-hole asymmetry and next-nearest-neighbor hopping in graphene

A. Kretinin,1 G. L. Yu,2 R. Jalil,1 Y. Cao,1 F. Withers,2 A. Mishchenko,2 M. I. Katsnelson,3 K. S. Novoselov,2 A. K. Geim,1,2 and F. Guinea4,5 1Manchester Centre for Mesoscience and Nanotechnology, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom 2School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom 3Theory of Cond...

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