Impurity dephasing in a Bose–Hubbard model
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 betwe...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2021-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/abe080 |
| _version_ | 1827872899325755392 |
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| author | Fabio Caleffi Massimo Capone Inés de Vega Alessio Recati |
| author_facet | Fabio Caleffi Massimo Capone Inés de Vega Alessio Recati |
| author_sort | Fabio Caleffi |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-12T16:31:03Z |
| format | Article |
| id | doaj.art-fff1c3b4e8dc4cfb886f6cc12038acca |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:31:03Z |
| publishDate | 2021-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-fff1c3b4e8dc4cfb886f6cc12038acca2023-08-08T15:32:11ZengIOP PublishingNew Journal of Physics1367-26302021-01-0123303301810.1088/1367-2630/abe080Impurity dephasing in a Bose–Hubbard modelFabio Caleffi0https://orcid.org/0000-0002-6573-5716Massimo Capone1Inés de Vega2Alessio Recati3International School for Advanced Studies (SISSA) , Via Bonomea 265, I-34136 Trieste, ItalyInternational School for Advanced Studies (SISSA) , Via Bonomea 265, I-34136 Trieste, Italy; CNR-IOM Democritos , Via Bonomea 265, I-34136 Trieste, ItalyDepartment of Physics and Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München , Theresienstr. 37, 80333 Munich, Germany; IQM Germany GmbH , Nymphenburgerstr. 86 80636 Munich, GermanyINO-CNR BEC Center, Dipartimento di Fisica, Università di Trento, Via Sommarive 14, 38123 Povo, Trento, Italy; Trento Institute for Fundamental Physics and Applications, INFN, Dipartimento di Fisica, Università di Trento, Via Sommarive 14, 38123 Povo, Trento, ItalyWe 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.https://doi.org/10.1088/1367-2630/abe080open quantum systemspure dephasingcold gases in optical latticesBose–Hubbard modelquasiparticles and collective excitations |
| spellingShingle | Fabio Caleffi Massimo Capone Inés de Vega Alessio Recati Impurity dephasing in a Bose–Hubbard model New Journal of Physics open quantum systems pure dephasing cold gases in optical lattices Bose–Hubbard model quasiparticles and collective excitations |
| title | Impurity dephasing in a Bose–Hubbard model |
| title_full | Impurity dephasing in a Bose–Hubbard model |
| title_fullStr | Impurity dephasing in a Bose–Hubbard model |
| title_full_unstemmed | Impurity dephasing in a Bose–Hubbard model |
| title_short | Impurity dephasing in a Bose–Hubbard model |
| title_sort | impurity dephasing in a bose hubbard model |
| topic | open quantum systems pure dephasing cold gases in optical lattices Bose–Hubbard model quasiparticles and collective excitations |
| url | https://doi.org/10.1088/1367-2630/abe080 |
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