Impurity dephasing in a Bose–Hubbard model
Impurity dephasing in a Bose–Hubbard model
复制标题
BoseâHubbard 模型中的杂质相移
DOI:
10.1088/1367-2630/abe080
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发表时间:
2021
影响因子:
3.3
通讯作者:
Alessio Recati
中科院分区:
文献类型:
--
作者:
Fabio Caleffi;Massimo Capone;Inés de Vega;Alessio Recati
We study the dynamics of a two-level impurity embedded in a two-dimensional Bose–Hubbard (BH) model at zero temperature from an open quantum system perspective. Results for the decoherence across the whole phase diagram are presented, with a focus on the critical region close to the transition between superfluid and Mott insulator. In particular we show how the decoherence and the deviation from a Markovian behaviour are sensitive to whether the transition is crossed at commensurate or incommensurate densities. The role of the spectrum of the BH environment and its non-Gaussian statistics, beyond the standard independent boson model, is highlighted. Our analysis resorts on a recently developed method (2020 Phys. Rev. Res. 2 033276)–closely related to slave boson approaches–that enables us to capture the correlations across the whole phase diagram. This semi-analytical method provides us with a deep insight into the physics of the spin decoherence in the superfluid and Mott phases as well as close to the phase transitions.
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影响因子:
2.3
作者:
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通讯作者:
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影响因子:
8.6
作者:
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作者:
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通讯作者:
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DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
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影响因子:
8.6
作者:
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