Temat: 05.10.Cc - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Electromagnetic Response of the BCS Superconductor: Flow Equation Approach
Autorzy:: Zapalska, M.
Domański, T.
Powiązania:: https://bibliotekanauki.pl/articles/1431495.pdf
Data publikacji:: 2012-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.Fg
71.10.Li
05.10.Cc
Opis:: We address the linear response for superconductors using the non-perturbative technique based on the continuous unitary transformation. We discuss how this method rigorously reproduces the standard BCS solution and point out how such result can be generalized to the case of electron systems with strong pairing fluctuations and in presence of the nonequilibrium phenomena.
Źródło:: Acta Physica Polonica A; 2012, 121, 4; 854-857
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Order in Quantum Compass and Orbital e_{g} Models
Autorzy:: Czarnik, P.
Dziarmaga, J.
Oleś, A.
Powiązania:: https://bibliotekanauki.pl/articles/1029762.pdf
Data publikacji:: 2018-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.10.Jm
05.10.Cc
05.70.Fh
75.25.Dk
Opis:: We investigate thermodynamic phase transitions in the compass model and in e_{g} orbital model on an infinite square lattice by variational tensor network renormalization (VTNR) in imaginary time. The onset of nematic order in the quantum compass model is estimated at _{c}/J=0.0606(4). For the e_{g} orbital model one finds: (i) a very accurate estimate of _{c}/J=0.3566± 0.0001 and (ii) the critical exponents in the Ising universality class. Remarkably large difference in frustration results in so distinct values of _{c}, while entanglement influences the quality of _{c} estimation.
Źródło:: Acta Physica Polonica A; 2018, 133, 3; 359-361
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Application of Contractor Renormalization Group to the Heisenberg Zig-Zag and the Hubbard Chain
Autorzy:: Cichy, K.
Tomczak, P.
Powiązania:: https://bibliotekanauki.pl/articles/2047340.pdf
Data publikacji:: 2007-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 05.10.Cc
03.65.Fd
75.10.Jm
71.10.Fd
Opis:: The contractor renormalization group method was devised in 1994 by Morningstar and Weinstein. It was primarily aimed at extracting the physics of lattice quantum field theories (like lattice quantum chromodynamics). However, it is a general method of analyzing Hamiltonian lattice systems, e.g. Ising, Heisenberg or Hubbard models. The aim of this work is to show the application of contractor renormalization group method to one-dimensional quantum systems - the Heisenberg zig-zag model and the Hubbard chain. As a test of the method, the ground state energy of these systems will be calculated.
Źródło:: Acta Physica Polonica A; 2007, 111, 5; 773-780
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Renormalization Group Approach for the Double Exchange Ferromagnets
Autorzy:: Zapalska, M.
Domański, T.
Powiązania:: https://bibliotekanauki.pl/articles/1409624.pdf
Data publikacji:: 2012-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 05.10.Cc
75.47.Gk
75.30.Et
75.30.Ds
Opis:: The discovery of the colossal magnetoresistance (CMR) in the manganese oxides with perovskite structures $T_1 - x DMnO_3$ (T = La, Pr, Nd; D=Sr, Ca, Ba, Pb) and its potential technological application motivated theoretical and experimental researchers to study the itinerant ferromagnetism. A first theoretical description of this phenomenon in terms of the double-exchange mechanism was given a long time ago by Zener. In this model, the spin orientation of adjacent Mn-moments is associated with kinetic exchange of conduction $e_g$ electrons. Consequently, alignment of the core Mn-spins by an external magnetic field causes higher conductivity. The Mn ions are considered as localized forming a spin of S = 3/2 and they are coupled to the itinerant electrons by a strong ferromagnetic Hund coupling, $J_H$ > 0. We apply the flow equation technique (nonperturbative method, based on continuous canonical transformation) to the double-exchange model for ferromagnetism described by the Kondo type Hamiltonian. We want to eliminate the interaction term responsible for non-conservation of magnon number and to take into account fermion and magnon degrees of freedom. We express the spin operators of Mn ions via the magnon operators (the Holstein-Primakoff transformation) and investigate the magnon excitation spectrum determined by Green's function.
Źródło:: Acta Physica Polonica A; 2012, 122, 6; 1099-1101
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Single Particle Excitation Spectrum of a Proximized Quantum Dot: The Flow Equation Study
Autorzy:: Zapalska, M.
Domański, T.
Powiązania:: https://bibliotekanauki.pl/articles/1374179.pdf
Data publikacji:: 2014-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 05.10.Cc
71.27.+a
72.15.Qm
74.45.+c
Opis:: We study the in-gap states of a quantum dot hybridized with the metallic and superconducting reservoirs applying the continuous unitary transformation to the Anderson-type Hamiltonian. We derive the set of flow equations and analyse the effective single particle excitation spectrum of the correlated quantum dot in presence of the induced electron pairing.
Źródło:: Acta Physica Polonica A; 2014, 126, 4a; A-137-A-140
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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