Strong-coupling Bose polarons in one dimension: Condensate deformation and modified Bogoliubov phonons
Strong-coupling Bose polarons in one dimension: Condensate deformation and modified Bogoliubov phonons
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一维强耦合玻色极化子:凝聚态变形和改进的 Bogoliubov 声子
DOI:
10.1103/physrevresearch.2.033142
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发表时间:
2020
影响因子:
4.2
通讯作者:
Jager J
中科院分区:
文献类型:
--
作者:
Jager J
We discuss the interaction of a quantum impurity with a one-dimensional degenerate Bose gas forming a Bose polaron. In three spatial dimension, the quasiparticle is typically well described by the extended Fröhlich model, in full analogy with the solid-state counterpart. This description, which assumes an undepleted condensate, fails, however, in 1D, where the backaction of the impurity on the condensate leads to a self-bound mean-field polaron for arbitrarily weak impurity-boson interactions. We present a model that takes into account this backaction and describes the impurity-condensate interaction as coupling to phononlike excitations of a deformed condensate. A comparison of polaron energies and masses to diffusion quantum Monte Carlo simulations shows very good agreement already on the level of analytical mean-field solutions and is further improved when taking into account quantum fluctuations.
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DOI:
--
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期刊:
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