Aug 26 

Computational Exploration of Fermion-Exciton Condensate

Abstract: Phenomena such as superconductivity and superfluidity arise due to a Bose-Einstein-like condensation of pairs of fermions into a single quantum state with large non-classical off-diagonal long-range order. Fermion pair condensates (FPCs)—the most-familiar of which involve the condensation of Cooper (electron) pairs—results in the superfluidity of their constituent electrons, which cause the material through which they flow to be both a perfect conductor and a perfect diamagnet. However, all currently-known superconductors condense at either too-low of temperatures or too-high of pressures to be viable. Similarly, exciton condensates (ECs) involve the condensation of particle-hole pairs (excitons) into a single quantum state to create a superfluid. This superfluidity of these relatively-light quasiparticles with comparatively-high binding energies are expected to condense at higher temperatures and involve the non-dissipative transfer of energy; however, exciton condensates often have too-short a lifetime to be easily observed in experiment. In this talk, I will introduce fermion-exciton condensates (FECs) — novel quantum states that simultaneously exhibit the character of superconducting states and exciton condensates and may demonstrate hybrid properties of both. The computational and theoretical prediction of these FECs as well as a model Hamiltonian that describes them will be introduced along with a state preparation for an FEC on a quantum device.