Theory of 2 δ-kicked quantum rotors
We examine the quantum dynamics of cold atoms subjected to pairs of closely spaced kicks from standing waves of light and find behavior quite unlike the well-studied quantum kicked rotor QKR. We show that the quantum phase space has a periodic, cellular structure arising from a unitary matrix with o...
| Authors: | ; ; |
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| Format: | Article |
| Publication date: | 2006 |
| Country: | España |
| Institution: | Universidad Complutense de Madrid (UCM) |
| Repository: | Docta Complutense |
| Language: | English |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/51582 |
| Online Access: | https://hdl.handle.net/20.500.14352/51582 |
| Access Level: | Open access |
| Keyword: | 538.9 Delta-kicked rotor Spectral statistics Disordered-systems Chaotic systems Eigenfunctions Transition Dynamics Barriers Cantori Models Física de materiales Física del estado sólido 2211 Física del Estado Sólido |
| Summary: | We examine the quantum dynamics of cold atoms subjected to pairs of closely spaced kicks from standing waves of light and find behavior quite unlike the well-studied quantum kicked rotor QKR. We show that the quantum phase space has a periodic, cellular structure arising from a unitary matrix with oscillating bandwidth. The corresponding eigenstates are exponentially localized, but scale with a fractional power L~ħ_(-0.75), in contrast to the QKR for which L~ħ_(-1). The effect of intercell (and intracell) transport is investigated by studying the spectral fluctuations with both periodic as well as “open” boundary conditions. |
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