Excitonic giant-dipole potentials in cuprous oxide

Abstract

In this work we predict the existence of a novel species of Wannier excitons when exposed to crossed electric and magnetic fields. In particular, we present a theory of giant-dipole excitons in ${\text{Cu}}_2\mathrm{O}$ in crossed fields. Within our theoretical approach we perform a pseudoseparation of the center-of-mass motion for the field-dressed excitonic species, thereby obtaining an effective single-particle Hamiltonian for the relative motion. For arbitrary gauge fields we exactly separate the gauge-dependent kinetic energy terms from the effective single-particle interaction potential. Depending on the applied field strengths and the specific field orientation, the potential for the relative motion of electron and hole exhibits an outer well at spatial separations up to several micrometers and depths up to $380\mu \mathrm{eV}$, leading to possible permanent excitonic electric dipole moments of around three million Debye.

11 pages, 6 figures, 1 table, only minor changes compared to the first version, accepted for publication in Phys. Rev. B (in print)

References in corpus (7)

• Ultracold atomic gases in optical lattices: mimicking condensed matter physics and beyond
• Giant Rydberg Excitons in Cuprous Oxide
• Observation of high angular momentum excitons in cuprous oxide
• Deviations of the exciton level spectrum in cuprous oxide from the hydrogen series
• Impact of the valence band structure of Cu${}_2$O on excitonic spectra
• High resolution study of the yellow excitons in Cu${}_2$O subject to an electric field
• Magnetoexcitons in cuprous oxide

Cited by in corpus (8)

• Interaction of charged impurities and Rydberg excitons in cuprous oxide
• Exciton-polaritons in cuprous oxide: Theory and comparison with experiment
• Interseries transitions between Rydberg excitons in Cu${}_2$O
• Magneto-Stark-effect of yellow excitons in cuprous oxide
• Crossover between the Gaussian orthogonal ensemble, the Gaussian unitary ensemble, and Poissonian statistics
• Observation of the motional Stark shift in low magnetic fields
• A Green's function approach to giant-dipole systems
• Eigenenergies of excitonic giant-dipole states in cuprous oxide