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pro vyhledávání: '"Voelker, Klaus"'
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Akademický článek
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Publikováno v:
Phys. Rev. Lett. 94, 047201 (2005)
We consider a one-dimensional Ising model in a transverse magnetic field coupled to a dissipative heat bath. The phase diagram and the critical exponents are determined from extensive Monte Carlo simulations. It is shown that the character of the qua
Externí odkaz:
http://arxiv.org/abs/cond-mat/0402224
Publikováno v:
Nature 428, 53 (2004)
A remarkable mystery of the copper oxide high-transition-temperature (Tc) superconductors is the dependence of Tc on the number of CuO2 layers, n, in the unit cell of a crystal. In a given family of these superconductors, Tc rises with the number of
Externí odkaz:
http://arxiv.org/abs/cond-mat/0309209
Publikováno v:
Phys. Rev. B 68, 094412 (2003)
Motivated by a recent experiment on Cs2CuCl4, we study the spin dynamics of the spin-liquid phase of the spin-1/2 frustrated Heisenberg antiferromagnet on the anisotropic triangular lattice. There have been two different proposals for the spin-liquid
Externí odkaz:
http://arxiv.org/abs/cond-mat/0302452
Autor:
Voelker, Klaus, Sigrist, Manfred
A multiband superconductor with a conventional phonon mechanism can develop an unconventional state with a nontrivial order parameter phase relation between the individual bands. We propose that such a state can explain recent experimental results on
Externí odkaz:
http://arxiv.org/abs/cond-mat/0208367
Autor:
Voelker, Klaus, Chakravarty, Sudip
Publikováno v:
Phys. Rev. B 64, 235125 (2001).
We consider a two-dimensional electron or hole system at zero temperature and low carrier densities, where the long-range Coulomb interactions dominate over the kinetic energy. In this limit the clean system will form a Wigner crystal. Non-trivial qu
Externí odkaz:
http://arxiv.org/abs/cond-mat/0107151
Autor:
Voelker, Klaus
The influence of gapless dissipative degrees of freedom on the superconductor-insulator transition in two dimensions is investigated. We develop a series expansion for the free energy of a (2+1)-dimensional XY model coupled to a bosonic heat bath tha
Externí odkaz:
http://arxiv.org/abs/cond-mat/9911473
Publikováno v:
Phil. Mag. B 79, 859, 1999.
Recent experiments on the two dimensional electron gas in various semiconductor devices have revealed an unexpected metal-insulator transition and have challenged the previously held assumption that there is no such transition in two dimensions. Whil
Externí odkaz:
http://arxiv.org/abs/cond-mat/9805383
Autor:
Voelker, Klaus
Publikováno v:
Phys. Rev. B 58, 1862 (1998)
We investigate the dynamical correlation function of a quantum-mechanical two-state system which is coupled to a bosonic heat bath, utilizing the equivalence between the spin-boson Hamiltonian and the 1/r^2 Ising model. The imaginary-time correlation
Externí odkaz:
http://arxiv.org/abs/cond-mat/9712080