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						<h1 itemprop="headline">AMO Seminar - David Petrosyan: Correlations of Rydberg excitations in optically driven atomic ensembles</h1>
						
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														Torsdag 28. november 2013,
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														&nbsp;kl. 15:15 -  16:00
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													<p class="news-event__info__item__ical-link"><a href="/aktuelt/nyhed/artikel/amo-seminar-david-petrosyan-correlations-of-rydberg-excitations-in-optically-driven-atomic-ensemb?tx_news_pi1%5Bformat%5D=ical&amp;type=9819&amp;cHash=c4b0a2df6740e9b7d2bcaab59a5befd1">Tilføj til kalender</a></p>
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														<p>Phys. Aud.</p>
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														<span itemprop="name">Grete Flarup</span>
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									<p><strong>Title:</strong> Correlations of Rydberg excitations in optically driven atomic ensembles<br><br><strong>Speaker:</strong> David Petrosyan, Institute of Electronic Structure &amp; Laser, Heraklion<br><br><strong>Time and place:</strong> Thursday 28/11, 15:15, Phys. Aud.<br><br><strong>Abstract:</strong><br>I will discuss resonant optical excitation of Rydberg states of atoms in the presence of relaxations. Atoms in high-lying Rydberg states strongly interact with each other via long-range potentials [1,2]. These interactions translate into the level shifts of multiple Rydberg excitations which are therefore strongly suppressed. Collection of atoms within a certain "blockade" volume can then accommodate at most a single Rydberg excitation [3,4].<br>Perhaps counterintuitively, dephasing of atomic polarization increases the steady-state excitation probability of such a Rydberg "superatom". Larger atomic ensembles can accommodate more Rydberg excitations which effectively repel each other. The Rydberg superatoms behave as soft spheres resulting in highly sub-Poissonian probability distribution of the number of excitations. In the finite size one- and two-dimensional systems, the boundary effects mediate quasi-crystallization of Rydberg excitations [5], while the density-density correlations exhibit damped spatial oscillations. <br>Similar to a single superatom, dephasing and larger atom density lead to stronger density-density correlations of Rydberg excitations [6].<br><br>[1] T.F. Gallagher, Rydberg Atoms (Cambridge University Press, Cambridge, 1994) [3] M. Saffman, T.G. Walker, K. Molmer, Rev. Mod. Phys. 82, 2313 (2010) [3] M.D. Lukin et al., Phys. Rev. Lett. 87, 037901 (2001) [4] Y.O. Dudin, L. Li, F. Bariani, and A. Kuzmich, Nature Phys. 8, 790<br>(2012)<br>[5] P. Schauss et al., Nature 491, 87 (2012) [6] D. Petrosyan, J. Phys. B 46, 141001 (2013); Phys. Rev. A 88, 043431 (2013); Phys. Rev. A 87, 053414 (2013).<br><br><em>Coffee, tea and cake will be served at 15:05</em>.<br><br>Annette Svendsen, Jacob Sherson and Aurelien Dantan</p>
								
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