Arpita Rakshit

Publications (5)2.88 Total impact

• Source

  Available from: ArXiv

  Article: Vacuum-Induced Coherence in Ultracold Photoassociative Ro-Vibrational Excitations

  Sumanta Das, Arpita Rakshit, Bimalendu Deb
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  ABSTRACT: We show that coherence between two excited ro-vibrational states belonging to the same molecular electronic configuration arises quite naturally due to their interaction with electromagnetic vacuum. For initial preparation of a molecule in the desired ro-vibrational states, we propose to employ the method of ultracold photoassociation. Spontaneous decay of the excited molecule then gives rise to vacuum induced coherence between the excited ro-vibrational states. We demonstrate theoretically an interesting interplay of effects due to vacuum induced coherence and photoassociation. We apply our theory to photoassociation of bosonic Ytterbium (^{174}Yb) atoms which appear to be a promising system for exploring such interplay. The effects discussed here can be important for controlling decoherence and dissipation in molecular systems.
  09/2011;
• Article: Formation of cold molecular ions by radiative processes in cold ion-atom collisions

  Arpita Rakshit, Bimalendu Deb
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  ABSTRACT: We discuss theoretically ion-atom collisions at low energy and predict the possibility of the formation of a cold molecular ion by photoassociation. We present results from radiative homo- and heteronuclear atom-ion cold collisions that reveal threshold behavior of atom-ion systems.
  Physical Review A 01/2011; 83(2):22703. · 2.88 Impact Factor
• Source

  Available from: ArXiv

  Article: Ion-atom cold collision: Formation of cold molecular ion by radiative processes

  Arpita Rakshit, Bimalendu Deb
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  ABSTRACT: We discuss theoretically ion-atom collisions at low energy and predict the possibility of formation of cold molecular ion by photoassociation. We present results on radiative homo- and hetero-nuclear atom-ion cold collisions that reveal threshold behaviour of atom-ion systems.
  09/2010;
• Source

  Available from: ArXiv

  Article: Suppression of power-broadening in strong-coupling photoassociation in the presence of a Feshbach resonance

  Bimalendu Deb, Arpita Rakshit
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  ABSTRACT: Photoassociation (PA) spectrum in the presence of a magnetic Feshbach resonance is analyzed. Nonperturbative solution of the problem yields analytical expressions for PA linewidth and shift which are applicable for arbitrary PA laser intensity and magnetic field tuning of Feshbach Resonance. We show that by tuning magnetic field close to Fano minimum, it is possible to suppress power broadening at increased laser intensities. This occurs due to quantum interference of PA transitions from unperturbed and perturbed continuum. Line narrowing at high laser intensities is accompanied by large spectral shifts. We briefly discuss important consequences of line narrowing in cold collisions. Comment: 12 pages, 5 figures
  08/2009;
• Article: Vacuum-induced coherence in ultracold photoassociative rovibrational excitations

  Sumanta Das, Arpita Rakshit, Bimalendu Deb
  [show abstract] [hide abstract]
  ABSTRACT: We show that coherence between two excited rovibrational states belonging to the same molecular electronic configuration arises quite naturally due to their interaction with electromagnetic vacuum. For initial preparation of a molecule in the desired rovibrational states, we propose to employ the method of ultracold photoassociation. Spontaneous decay of the excited molecule then gives rise to vacuum-induced coherence between the excited ro-vibrational states. We demonstrate theoretically an interesting interplay of effects due to vacuum-induced coherence and photoassociation. We apply our theory to photoassociation of bosonic ytterbium (174Yb) atoms, which appear to be a promising system for exploring such interplay. The effects discussed here can be important for controlling decoherence and dissipation in molecular systems.
  Phys. Rev. A. 85(1).