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Pragna Das

As seen in: MDPI, Physical Review B
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Articles

Travel Time Estimation for Optimal Planning in Internal Transportation

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By Pragna Das, Lluís Ribas-Xirgo
| MDPI
All articles published by MDPI are made immediately available worldwide under an open access license. No special permission is required to reuse all or part of the article published by MDPI, including figures and tables. For articles published under an open access Creative Common CC BY license, any part of the article may be reused without permission provided that the original article is clearly cited. For more information, please refer to https://www.mdpi.com/openaccess.
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Dicke model with disordered spin-boson couplings

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By Pragna Das, Sebastian Wüster, Auditya Sharma
| Physical Review B
We introduce and study the disordered Dicke model in which the spin-boson couplings are drawn from a random distribution with some finite width. Regarding the quantum phase transition, we show that, when the standard deviation σ of the coupling strength gradually increases, the critical value of the mean coupling strength μ gradually decreases, and after a certain σ there is no quantum phase transition at all; the system always lies in the superradiant phase.
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Phase transitions of the anisotropic Dicke model

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By Pragna Das, Devendra Singh Bhakuni, Auditya Sharma
| Physical Review B
Abstract We systematically analyze the various phase transitions of the anisotropic Dicke model that is endowed with both rotating and counterrotating light-matter couplings. In addition to the ground-state quantum phase transition (QPT) from the normal to the superradiant phase, the anisotropic Dicke model also exhibits other transitions, namely, the excited state quantum phase transition (ESQPT), ergodic to nonergodic transition (ENET), and the temperature-dependent phase transition.
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