Two-level parabolic model with phase-jump coupling



: Lehto JMS, Suominen KA

Publisher: AMER PHYSICAL SOC

: 2016

: Physical Review A

: PHYSICAL REVIEW A

: PHYS REV A

: ARTN 013404

: 94

: 1

: 7

: 2469-9926

DOI: https://doi.org/10.1103/PhysRevA.94.013404


We study the coherent dynamics of a two-level parabolic model and ways to enhance population transfer and even to obtain complete population inversion in such models. Motivated by the complete population inversion effect of zero-area pulses found in [Phys. Rev. A 73, 023416 (2006)], we consider a scheme where a given coupling function is transformed to a zero-area coupling by performing a phase jump in the middle of the evolution. With a phase-jump coupling, complete population inversion can be achieved with relatively small coupling. In the case of Zener tunneling, complete population inversion is obtained for strong-enough coupling regardless of the height of the tunneling barrier. We also derive a universal formula for the effect of the phase jump.



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