Zobrazeno 1 - 10
of 407
pro vyhledávání: '"Bortz, M"'
Publikováno v:
Phys. Rev. B 76 (2007) 085120
We investigate pairing and quantum phase transitions in the one-dimensional two-component Fermi atomic gas in an external field. The phase diagram, critical fields, magnetization and local pairing correlation are obtained analytically via the exact t
Externí odkaz:
http://arxiv.org/abs/cond-mat/0702191
Autor:
Bortz, M., Sirker, J.
Publikováno v:
J. Phys. A: Math. Gen. 39, 7187 (2006)
The magnetic susceptibility of the one-dimensional Hubbard model with open boundary conditions at arbitrary filling is obtained from field theory at low temperatures and small magnetic fields, including leading and next-leading orders. Logarithmic co
Externí odkaz:
http://arxiv.org/abs/cond-mat/0602511
Publikováno v:
J. Stat. Mech. (2006) P03016
We investigate the elementary excitations of charge and spin degrees for the 1D interacting two-component Bose and Fermi gases by means of the discrete Bethe ansatz equations. Analytic results in the limiting cases of strong and weak interactions are
Externí odkaz:
http://arxiv.org/abs/cond-mat/0512486
Publikováno v:
J. Phys. A 39 (2006) 1073-1098
We extend the exact periodic Bethe Ansatz solution for one-dimensional bosons and fermions with delta-interaction and arbitrary internal degrees of freedom to the case of hard wall boundary conditions. We give an analysis of the ground state properti
Externí odkaz:
http://arxiv.org/abs/cond-mat/0511694
Autor:
Sirker, J., Bortz, M.
Publikováno v:
J.Stat.Mech.0601:P01007,2006
We calculate the bulk and boundary parts of the free energy for an open spin-1/2 XXZ-chain in the critical regime by bosonisation. We identify the cutoff independent contributions and determine their amplitudes by comparing with Bethe ansatz calculat
Externí odkaz:
http://arxiv.org/abs/cond-mat/0511272
Autor:
Sirker, J., Bortz, M.
Publikováno v:
Phys. Rev. B 73, 014424 (2006)
We calculate the temperature dependence of the boundary susceptibility $\chi_B$ for the quantum ferromagnetic Heisenberg chain by a modified spin-wave theory (MSWT). We find that $\chi_B$ diverges at low temperatures $\sim -T^{-3}$ and therefore more
Externí odkaz:
http://arxiv.org/abs/cond-mat/0509168
Publikováno v:
J. Stat. Mech. (2005) L10001
We provide evidence in support of a recent proposal by Astrakharchik at al. for the existence of a super Tonks-Girardeau gas-like state in the attractive interaction regime of quasi-one-dimensional Bose gases. We show that the super Tonks-Giradeau ga
Externí odkaz:
http://arxiv.org/abs/cond-mat/0508009
Publikováno v:
Phys. Rev. A 72, 061603 (2005)
The exact solution of the 1D interacting mixed Bose-Fermi gas is used to calculate ground-state properties both for finite systems and in the thermodynamic limit. The quasimomentum distribution, ground-state energy and generalized velocities are obta
Externí odkaz:
http://arxiv.org/abs/cond-mat/0506478
Publikováno v:
J. Phys. Conf. Ser. 42 (2006) 5
We investigate the 1D interacting two-component Fermi gas with arbitrary polarization. Exact results for the ground state energy, quasimomentum distribution functions, spin velocity and charge velocity reveal subtle polarization dependent quantum eff
Externí odkaz:
http://arxiv.org/abs/cond-mat/0506264
Publikováno v:
In IFAC PapersOnLine 2018 51(2):747-752
