Excited-state quantum phase transitions in spin-orbit coupled Bose gases

Abstract

Excited-state quantum phase transitions depend on and reveal the structure of the whole spectrum of many-body systems. While they are theoretically well understood, finding suitable signatures and detect them in actual experiments remains challenging. For instance, in spinor gases, excited-state phases have been identified and characterized through a topological order parameter that is challenging to measure in experiments. Here, we propose the Raman-dressed spin-orbit coupled gas as a novel platform to explore excited-state quantum phase transitions. In a weakly-coupled regime, the dressed system is equivalent to a spinor gas with tunable spin-spin interactions. Through this equivalence we are able to define a new excited-state phase of the dressed gas. The phase is characterize by the the behavior of the spatial density modulations, or stripes, induced by spin-orbit coupling, and can in principle be measured in current state-of-the-art experiments with ultracold atoms. Conversely, we show that the properties of the excited phase can be exploited to prepare stripe states with large and stable density modulations.

10 pages, 8 figures

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Cited by in corpus (13)

• Encoding a one-dimensional topological gauge theory in a Raman-coupled Bose-Einstein condensate
• Dynamical quantum phase transitions in a spinor Bose-Einstein condensate and criticality enhanced quantum sensing
• Relative asymptotic oscillations of the out-of-time-ordered correlator as a quantum chaos indicator
• Probing supersolidity through excitations in a spin-orbit-coupled Bose-Einstein condensate
• Excited state quantum phase transition and Loschmidt echo spectra in a spinor Bose-Einstein condensate
• Dispersion engineering in spin-orbit coupled spinor $F=1$ condensates driven by negative masses
• Excited-State Phase Diagram of a Ferromagnetic Quantum Gas
• Relaxation time as a control parameter for exploring dynamical phase diagrams
• Controlling atomic spin-mixing via multiphoton transitions in a cavity
• Excited stated quantum phase transitions and the entropy of the work distribution in the anharmonic Lipkin-Meshkov-Glick model
• Multifractality and excited-state quantum phase transition in ferromagnetic spin-$1$ Bose-Einstein condensates
• Encoding a topological gauge theory on a ring-shaped Raman-coupled Bose gas
• Energy cat states induced by a parity-breaking excited-state quantum phase transition