Quench dynamics of two interacting atoms in a one-dimensional anharmonic trap
Ishmukhamedov I.S.
August 2022Elsevier B.V.
Physica E: Low-Dimensional Systems and Nanostructures
2022#142
A temporal response of two interacting particles to a quench of the coupling strength in one-dimensional harmonic and anharmonic traps is explored. The coupling strength is changed from repulsive to attractive interactions and vice versa. The time evolution of the fidelity, one-body reduced density matrix and momentum distributions is analyzed in details. It was found that impacts of the pre- and postquench states interchange during the dynamics. In the case of the anharmonic trap additional contribution of the center-of-mass excited states comes into play and the whole evolution becomes significantly altered. Yet the impact of the pre- and postquench states in some cases can still be identified. The quench dynamics of the ground and excited states are considered.
Anharmonic oscillator , Delocalization , Density-matrix , Interatomic potentials , Nonequilibrium physics , Quench dynamics
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Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Moscow Region, Dubna, 141980, Russian Federation
Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
The Institute of Nuclear Physics, Ministry of Energy of the Republic of Kazakhstan, Almaty, 050032, Kazakhstan
Bogoliubov Laboratory of Theoretical Physics
Al-Farabi Kazakh National University
The Institute of Nuclear Physics
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