2009/10/15 by Christopher R. Jamell, Changhua Zhang, Chang-hua Zhang +4
Engineering · Physics and Astronomy · #FOS: Physical sciences #Molecular Junctions and Nanostructures #Semiconductor Quantum Structures and Devices #Spectroscopy and Quantum Chemical Studies #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.0910.2993
4 pages, 4 figures
arxiv created 2009/10/15 · openalex publication_date 2009/10/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Double layer systems where one layer has electrons and the holes are in a parallel layer a distance d away are expected to undergo excitonic condensation at low temperature. This excitonic condensate is traditionally described by a many-body wavefunction that encodes the coherence between electron and hole bands. Here we compare the mean-field ground state in the limit of dilute electron (hole) density with the ground state of a single electron-hole pair in double-layer system. As the interlayer distance d increases, we find that the excitonic size, characterized by the width of the momentum-space wavefunction, also increases. By comparing the single-exciton wavefunction with the mean-field analysis, we determine the d-dependence of the "diluteness" of the exciton gas in a balanced double-layer system with given electron (or hole) density.