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Driven dynamics of an attractive Bose polaron

  • Saptarshi Majumdar
  • Aleksandra Petković
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Abstract

We study the out-of-equilibrium dynamics of an impurity driven by a constant external force through a system of homogeneous weakly-interacting bosons in one spatial dimension. The impurity-boson interaction is assumed to be attractive. We show that the impurity exhibits drifted Bloch oscillations in a wide range of forces in the absence of a lattice. We characterize the dynamical response of the host bosons and explain the mechanism underlying the Bloch oscillations. We analyse the behavior of the drift velocity, the Bloch amplitude and the time period of oscillations in a wide range of forces and other system parameters. In contrast to the case of repulsive impurity-boson interaction, the drift velocity exhibits a sub-linear dependence on a weak applied force, Vd∼ Fα with a positive exponent α smaller than unity. The drift velocity monotonically increases with force, though the scaling behavior varies considerably across different regimes of F. Moreover, the amplitude of the velocity oscillations displays rich behavior: it first undergoes a decay with force, reaches a minimum, and then presents a revival, increasing with force.

Versions

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Cite

BibTeXRIS
BibTeX
@misc{majumdar2026driven,
  title = {{Driven dynamics of an attractive Bose polaron}},
  author = {Saptarshi Majumdar and Aleksandra Petković},
  howpublished = {arXiv},
  year = {2026},
  month = jun,
  doi = {10.48550/arxiv.2606.13645},
  eprint = {2606.13645},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.13645},
}
RIS
TY  - UNPB
TI  - Driven dynamics of an attractive Bose polaron
AU  - Saptarshi Majumdar
AU  - Aleksandra Petković
PY  - 2026
DA  - 2026/06/11
PB  - arXiv
DO  - 10.48550/arxiv.2606.13645
UR  - https://arxiv.org/abs/2606.13645
AB  - We study the out-of-equilibrium dynamics of an impurity driven by a constant external force through a system of homogeneous weakly-interacting bosons in one spatial dimension. The impurity-boson interaction is assumed to be attractive. We show that the impurity exhibits drifted Bloch oscillations in a wide range of forces in the absence of a lattice. We characterize the dynamical response of the host bosons and explain the mechanism underlying the Bloch oscillations. We analyse the behavior of the drift velocity, the Bloch amplitude and the time period of oscillations in a wide range of forces and other system parameters. In contrast to the case of repulsive impurity-boson interaction, the drift velocity exhibits a sub-linear dependence on a weak applied force, V_d∼ F^α with a positive exponent α smaller than unity. The drift velocity monotonically increases with force, though the scaling behavior varies considerably across different regimes of F. Moreover, the amplitude of the velocity oscillations displays rich behavior: it first undergoes a decay with force, reaches a minimum, and then presents a revival, increasing with force.
ER  -