Triangular and honeycomb lattices of cold atoms in optical cavities
| Autor: | Christian Miniatura, Shabnam Safaei, Benoît. Grémaud |
|---|---|
| Přispěvatelé: | Institute of Advanced Studies |
| Rok vydání: | 2015 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Optical lattice Cavity quantum electrodynamics FOS: Physical sciences Physics::Optics Superradiance Laser pumping Crystal structure Laser Atomic and Molecular Physics and Optics law.invention Quantum Gases (cond-mat.quant-gas) law Lattice (order) Hexagonal lattice Physics::Atomic Physics Atomic physics Condensed Matter - Quantum Gases |
| Zdroj: | Physical Review A. 92 |
| ISSN: | 1094-1622 1050-2947 |
| DOI: | 10.1103/physreva.92.043810 |
| Popis: | We consider a two-dimensional homogeneous ensemble of cold bosonic atoms loaded inside two optical cavities and pumped by a far-detuned external laser field. We examine the conditions for these atoms to self-organize into triangular and honeycomb lattices as a result of superradiance. By collectively scattering the pump photons, the atoms feed the initially empty cavity modes. As a result, the superposition of the pump and cavity fields creates a space-periodic light-shift external potential and atoms self-organize into the potential wells of this optical lattice. Depending on the phase of the cavity fields with respect to the pump laser, these minima can either form a triangular or a hexagonal lattice. By numerically solving the dynamical equations of the coupled atom-cavity system, we have shown that the two stable atomic structures at long times are the triangular lattice and the honeycomb lattice with equally populated sites. We have also studied how to drive atoms from one lattice structure to another by dynamically changing the phase of the cavity fields with respect to the pump laser. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version |
| Databáze: | OpenAIRE |
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