Work Extraction and Quantum Phase Transitions in Field-Atom Interactions
RAUL AMAURY ROBLES ROBLES1*, Ray-Kuang Lee1,2
1Institute of Photonic Technologies, National Tsing Hua University, Hsinchu, Taiwan
2Depart. of Physics,, National Tsing-Hua University, Hsinchu, Taiwan
* Presenter:RAUL AMAURY ROBLES ROBLES
We study the conditions under which Work can be extracted in atomic-field quantum interaction scheme, mainly in the Dicke and Tavis-Cummings Hamiltonians. We show that the presence of the Quantum Phase Transitions (QPT) can facilitate work extraction. However, crossing the QPT does not ensure extraction of Work. In our research, we explored a cyclic protocol for work extraction, by means of a numerical approach for a finite number of atoms. Our result shows that the QPT can, certainly, enhance work extraction on such systems. However, we also found that the use of the rotating wave approximation, which is a common tool in studying atom-field dynamics, has a crucial role in the work extraction.


Keywords: Quantum Phase Transitions, Dicke Hamiltonian, Tavis-Cummings Hamiltonian, Work Extraction