Temat: many - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Many-Body Localization for Randomly Interacting Bosons
Autorzy:: Sierant, P.
Delande, D.
Zakrzewski, J.
Powiązania:: https://bibliotekanauki.pl/articles/1033315.pdf
Data publikacji:: 2017-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: many-body localization
Bose-Hubbard model
disorder in many-body physics
mobility edge
Opis:: We study many-body localization in a one dimensional optical lattice filled with bosons. The interaction between bosons is assumed to be random, which can be realized for atoms close to a microchip exposed to a spatially fluctuating magnetic field. Close to a Feshbach resonance, such controlled fluctuations can be transfered to the interaction strength. We show that the system reveals an inverted mobility edge, with mobile particles at the lower edge of the spectrum. A statistical analysis of level spacings allows us to characterize the transition between localized and excited states. The existence of the mobility edge is confirmed in large systems, by time dependent numerical simulations using tDMRG. A simple analytical model predicts the long time behavior of the system.
Źródło:: Acta Physica Polonica A; 2017, 132, 6; 1707-1712
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Collectivity and Periodic Orbits in a Chain of Interacting, Kicked Spins
Autorzy:: Akila, M.
Waltner, D.
Gutkin, B.
Braun, P.
Guhr, T.
Powiązania:: https://bibliotekanauki.pl/articles/1030009.pdf
Data publikacji:: 2017-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: quantum chaos
many-body systems
semiclassics
Opis:: The field of quantum chaos originated in the study of spectral statistics for interacting many-body systems, but this heritage was almost forgotten when single-particle systems moved into the focus. In recent years new interest emerged in many-body aspects of quantum chaos. We study a chain of interacting, kicked spins and carry out a semiclassical analysis that is capable of identifying all kinds of genuine many-body periodic orbits. We show that the collective many-body periodic orbits can fully dominate the spectra in certain cases.
Źródło:: Acta Physica Polonica A; 2017, 132, 6; 1661-1665
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Some Details of Statistical Mechanics of Many-Body Systems in the Presence of a Measurable Minimal Length
Autorzy:: Alizadeh, A.
Nozari, K.
Powiązania:: https://bibliotekanauki.pl/articles/1032577.pdf
Data publikacji:: 2017-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: quantum gravity phenomenology
statistical physics
many-body systems
minimal measurable length
Opis:: Different approaches to quantum gravity proposal such as string theory, doubly special relativity, and also black holes physics, all commonly address the existence of a minimal measurable length of the order of the Planck length. One way to apply the minimal length is changing the Heisenberg algebra in the phase space which is known as the generalized uncertainty principle. It is essential to apply this feature on the statistical mechanics of many body systems in the presence of a measurable minimal length scale in order to see the roles of this natural cutoff on physical phenomena. In this paper, some details of statistical mechanics of many body systems that have not been studied carefully in literature are studied in the presence of minimal length scale. The issues such as isomerization, the Liouville theorem, virial theorem and equipartition theorem are studied in this setup with details and the results are explained thoroughly.
Źródło:: Acta Physica Polonica A; 2017, 132, 4; 1329-1332
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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