Collective Phenomena in Quasi-Two-Dimensional Fermionic Polar Molecules: Band Renormalization and Excitons
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Collective Phenomena in Quasi-Two-Dimensional Fermionic Polar Molecules: Band Renormalization and Excitons
| Title: | Collective Phenomena in Quasi-Two-Dimensional Fermionic Polar Molecules: Band Renormalization and Excitons |
| Author: |
Demler, Eugene A.; Babadi, Mehrtash
Note: Order does not necessarily reflect citation order of authors. |
| Citation: | Babadi, Mehrtash, and Eugene Demler. 2011. Collective phenomena in quasi-two-dimensional fermionic polar molecules: band renormalization and excitons. Physical Review A 84(3): 033636. |
| Full Text & Related Files: |
1106.4345v1.pdf (3.999Mb; PDF) 
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| Abstract: | We theoretically analyze a quasi-two-dimensional system of fermionic polar molecules in a harmonic transverse confining potential. The renormalized energy bands are calculated by solving the Hartree-Fock equation numerically for various trap and dipolar interaction strengths. The inter-subband excitations of the system are studied in the conserving time-dependent Hartree-Fock (TDHF) approximation from the perspective of lattice modulation spectroscopy experiments. We find that the excitation spectrum consists of both inter-subband particle-hole excitation continuums and anti-bound excitons, arising from the anisotropic nature of dipolar interactions. The excitonic modes capture the majority of the spectral weight. We also evaluate the inter-subband transition rates in order to investigate the nature of the excitonic modes and find that they are anti-bound states formed from particle-hole excitations arising from several subbands. Our results indicate that the excitonic effects are present for interaction strengths and temperatures accessible in current experiments with polar molecules. |
| Published Version: | doi://10.1103/PhysRevA.84.033636 |
| Other Sources: | http://arxiv.org/abs/1106.4345v1 |
| Terms of Use: | This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP |
| Citable link to this page: | http://nrs.harvard.edu/urn-3:HUL.InstRepos:13421136 |
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