Macroscopic Self-Trapping and Dynamical Phase Transition in Momentum Space Bose-Einstein Condensates
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911211024547840 |
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| author | Schimelfenig, Colby Serrano, Federico Halverson, Corey Mukhopadhyay, Annesh Guan, Qingze Engels, Peter |
| author_facet | Schimelfenig, Colby Serrano, Federico Halverson, Corey Mukhopadhyay, Annesh Guan, Qingze Engels, Peter |
| contents | Self-trapping is a hallmark phenomenon of nonlinear dynamics. It has significant applications in modern physics, including band structure engineering, phase transition dynamics, quantum metrology, and more. Dilute-gas Bose-Einstein condensates (BECs), in which self-trapping can arise from interatomic interactions, are a prime testbed for probing nonlinear dynamics. In this Letter, we report the observation of self-trapping in a spin-orbit coupled BEC subjected to a stationary optical lattice. We employ Raman-induced spin-orbit coupling, complemented by a matching optical lattice that facilitates coupling between momentum eigenstates of the spin-orbit coupled system. By ramping the Raman detuning, we probe atomic current flow between these eigenstates and identify a clear distinction between a delocalized mixed state and a self-trapped regime. Following a quench of the Raman detuning, the time-averaged atomic current exhibits non-analytic behavior across the transition between these two regimes in certain parameter ranges, signaling a dynamical phase transition in the system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_13056 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Macroscopic Self-Trapping and Dynamical Phase Transition in Momentum Space Bose-Einstein Condensates Schimelfenig, Colby Serrano, Federico Halverson, Corey Mukhopadhyay, Annesh Guan, Qingze Engels, Peter Quantum Gases Atomic Physics Quantum Physics Self-trapping is a hallmark phenomenon of nonlinear dynamics. It has significant applications in modern physics, including band structure engineering, phase transition dynamics, quantum metrology, and more. Dilute-gas Bose-Einstein condensates (BECs), in which self-trapping can arise from interatomic interactions, are a prime testbed for probing nonlinear dynamics. In this Letter, we report the observation of self-trapping in a spin-orbit coupled BEC subjected to a stationary optical lattice. We employ Raman-induced spin-orbit coupling, complemented by a matching optical lattice that facilitates coupling between momentum eigenstates of the spin-orbit coupled system. By ramping the Raman detuning, we probe atomic current flow between these eigenstates and identify a clear distinction between a delocalized mixed state and a self-trapped regime. Following a quench of the Raman detuning, the time-averaged atomic current exhibits non-analytic behavior across the transition between these two regimes in certain parameter ranges, signaling a dynamical phase transition in the system. |
| title | Macroscopic Self-Trapping and Dynamical Phase Transition in Momentum Space Bose-Einstein Condensates |
| topic | Quantum Gases Atomic Physics Quantum Physics |
| url | https://arxiv.org/abs/2510.13056 |