Engineering superfluidity in electron-hole double layers

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...

F Ur Mathematik in Den Naturwissenschaften Leipzig Engineering Superruidity in Electron-hole Double Layers

Drag in paired electron-hole layers.

We investigate transresistance effects in electron-hole double-layer systems with an excitonic condensate. Our theory is based on the use of a minimum dissipation premise to fix the current carried by the condensate. We find that the drag resistance jumps discontinuously at the condensation temperature and diverges as the temperature approaches zero. PACS number: 73.50.Dn Typeset using REVTEX 1...

Tunneling current bistability of correlated 2D electron±hole layers

We study the low-temperature vertical tunneling current (TC) of a system of coupled 2D electron and hole gases (2DEG, 2DHG) of equal density realized in a single-barrier GaAs/AlAs/GaAs p±i±n heterostructure under conditions of forward bias. The density can be tuned by external voltage and the in-plane inter-particle distance can be made comparable to the layer separation (25 nm), the GaAs Bohr ...

High-temperature superfluidity in double-bilayer graphene.

Exciton bound states in solids between electrons and holes are predicted to form a superfluid at high temperatures. We show that by employing atomically thin crystals such as a pair of adjacent bilayer graphene sheets, equilibrium superfluidity of electron-hole pairs should be achievable for the first time. The transition temperatures are well above liquid helium temperatures. Because the sampl...