Titlebook: Quantum Many-Body Physics in Open Systems: Measurement and Strong Correlations; Yuto Ashida Book 2020 The Editor(s) (if applicable) and Th

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Quantum Particle in a Magnetic Environment,ent. The ultimate building block of such a system is the formation of a polarization cloud of collective excitations around an impurity, which is known as a polaron cloud. Yet, ever since the original paper by Landau and Pekar [.], it has long remained a fundamental challenge to measure it in an una

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Conclusions and Outlook,ver on quantum many-body phenomena. We discuss several intriguing open questions such as possible thermalization of integrable or many-body localized systems under measurement or dissipation, and effects of quantum jumps on many-body dynamics in long-time regimes. The second part is concerned with o

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Quantum Critical Phenomena,underlying quantum critical behavior. In the second part, we study how the measurement backaction influences on quantum phase transitions in higher dimensions by focusing on the Bose-Hubbard model. For all the theoretical considerations, we discuss possible experimental implementations in ultracold atomic gases.

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Conclusions and Outlook,pen quantum systems correlated with an external many-body environment. We discuss how the versatile variational approaches developed in this thesis can be applied to address important open questions in various fields such as condensed matter physics and AMO physics.

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Yuto AshidaNominated as an outstanding Ph.D. thesis by the University of Tokyo, Japan.Demonstrates the emergence of qualitatively new quantum many-body phenomena in nonunitary open and out-of-equilibrium systems