Title: Dipolar exciton condensation in one-dimensional materials

 

Abstract: We demonstrate that spatially separated populations of one-dimensional electrons and holes may form a true condensate of dipolar excitons characterised by off-diagonal long range order and global phase coherence. This is unexpected, since the Mermin-Wagner theorem states that long range order should not exist in 1D systems. 

However, we show that adding a single particle hybridization between the electron and hole populations breaks a continuous symmetry and allows many body effects to dominate the ground state. The superfluid condensate may have important technological applications in transistor and thermoelectric devices.