Quantum effects at low-energy atom–molecule interface

Deb, Bimalendu; Rakshit, Arpita; Hazra, Jisha; Chakraborty, Debashree

doi:10.1007/s12043-012-0473-4

Cited by 3 publications

(2 citation statements)

References 74 publications

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“…Laser dressing of continuumbound coupled systems in the context of autoionization and photoionization had been extensively studied earlier demonstrating many interesting effects such as 'confluence of coherences' [25], population trapping with laser-induced continuum structure [26], non-decaying dressed-states in continuum [27], line-narrowing of autoionizing states [28], etc. Our model can be extended to explore analogous effects in a new parameter regime at the photoassociatve interface [29] of ultracold atoms and molecules.…”

Section: Discussionmentioning

confidence: 99%

Decay dynamics in a strongly driven atom–molecule coupled system

Rakshit¹,

Ghosh²,

Deb³

2014

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. Within the framework of master equation, we study decay dynamics of an atommolecule system strongly coupled by two photoassociation lasers. Summing over the infinite number of electromagnetic vacuum modes that are coupled to the system, we obtain an integrodifferential master equation for the the system's reduced density matrix. We use this equation to describe correlated spontaneous emission from a pair of electronically excited diatomic ro-vibrational states. The temporal evolution of emitted radiation intensity shows quantum beats that result from the laser-induced coherence between the two excited states. The phase difference between the two driving fields is found to significantly affect the decay dynamics and the beats. Our results demonstrate the possibility to control decay and decoherence in the system by tuning the relative intensity and the phase between the two lasers. We further show that, if the ground-state continuum has a shape resonance at a low energy, then the quantum beats show two distinctive time scales of oscillations in the strong coupling regime. One of the time scales originates from the energy gap between the two excited states while the other time scale corresponds to the collision energy at which free-bound Franck-Condon overlap is resonantly peaked due to the shape resonance.

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Section: Discussionmentioning

confidence: 99%

Decay dynamics in a strongly driven atom–molecule coupled system

Rakshit¹,

Ghosh²,

Deb³

2014

J. Phys. B: At. Mol. Opt. Phys.

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“…For instance, analysis of the two-colour PA system has been carried out in the light of quantum scattering theory [20,21,39,40]. A number of works have resorted to semiclassical treatment based on the Schrödinger wave equation [36,[41][42][43][44][45][46][47] without taking into account any dissipation process. Quasi-continuum modelling on the basis of box quantisation of the continuum [49,50] has been introduced to deal with continuum-bound coupled problems in a Bose-Einstein condensate.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetically induced transparency in two-colour ultracold photoassociation

Naskar

Saha

Dey

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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We show how to apply the density matrix approach, including radiative relaxation processes, to calculate the linear optical susceptibility due to a probe laser beam propagated through a photoassociation (PA) system of ultracold atoms. We describe the absorptive and dispersive properties of a two-colour PA system where one laser drives a continuum–bound photoassociative transition and the other laser a bound–bound transition. Taking either of the lasers as a probe and the other one as a control field, we discuss the physical conditions under which electromagnetically induced transparency is possible in such continuum systems. We illustrate our numerical results using two-colour PA in ultracold 174Yb as an example.

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Dynamical quantum phase transitions in an atom-molecule system

Huang,

Yin,

et al. 2024

AIP Advances

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We conduct an investigation on the dynamical quantum phase transition within an atom-molecule Bose–Einstein condensate. We explore the dynamics of atom-molecule conversion and utilize the fraction population of the atom as an order parameter for probing dynamical quantum phase transitions. It is shown that the quench dynamics of the atom presents a non-analytical change regarding the atom binding energy, and it is demonstrated that this dynamics can detect both the quantum phase transition at the ground state and at the highest energy level. Furthermore, we analyze the dynamics of the Loschmidt echo and present its connection with the dynamical quantum phase transitions.

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Quantum effects at low-energy atom–molecule interface

Cited by 3 publications

References 74 publications

Decay dynamics in a strongly driven atom–molecule coupled system

Decay dynamics in a strongly driven atom–molecule coupled system

Electromagnetically induced transparency in two-colour ultracold photoassociation

Dynamical quantum phase transitions in an atom-molecule system

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