Zobrazeno 1 - 10
of 159
pro vyhledávání: '"Whelan N"'
Autor:
Whelan, N. D., Carbotte, J. P.
Among high T_c materials, the YBCO (YBa_2Cu_3O_{7-x}) compounds are special since they have superconducting chains as well as planes. We show that a discontinuity in the density of states as a function of magnetic field may appear at a new energy sca
Externí odkaz:
http://arxiv.org/abs/cond-mat/9911145
Autor:
Eells, J. T., Henry, M. M., Summerfelt, P., Wong-Riley, M. T. T., Buchmann, E. V., Kane, M., Whelan, N. T., Whelan, H. T.
Publikováno v:
Proceedings of the National Academy of Sciences of the United States of America, 2003 Mar . 100(6), 3439-3444.
Externí odkaz:
https://www.jstor.org/stable/3139378
Autor:
Goodings, D. A., Whelan, N. D.
Publikováno v:
J.Phys.A:Math. Gen., vol.31, 7521 (1998).
The transfer operator due to Bogomolny provides a convenient method for obtaining a semiclassical approximation to the energy eigenvalues of a quantum system, no matter what the nature of the analogous classical system. In this paper, the method is a
Externí odkaz:
http://arxiv.org/abs/chao-dyn/9803031
Publikováno v:
Phys. Rev. A vol. 50, R911 (1999)
Periodic orbit expressions for the density of states lead to spurious results when directly used to calculate quantities of thermodynamic interest. This is because the trace formula is usually valid only for large energies while the calculations make
Externí odkaz:
http://arxiv.org/abs/chao-dyn/9803015
Closed expressions are derived for the resonance widths and Coulomb blockade conductance peak heights in quantum dots for the crossover regime between conserved and broken time-reversal symmetry. The results hold for leads with any number of possibly
Externí odkaz:
http://arxiv.org/abs/cond-mat/9609115
Autor:
Whelan, N. D.
Publikováno v:
J.Phys.A vol.30, 533 (1997).
We discuss the symmetry decomposition of the average density of states for the two dimensional potential $V=x^2y^2$ and its three dimensional generalisation $V=x^2y^2+y^2z^2+z^2x^2$. In both problems, the energetically accessible phase space is non-c
Externí odkaz:
http://arxiv.org/abs/chao-dyn/9609004
Autor:
Leviatan, A., Whelan, N. D.
Publikováno v:
Phys. Rev. Lett. 77 (1996) 5202
Partial dynamical symmetry describes a situation in which some eigenstates have a symmetry which the quantum Hamiltonian does not share. This property is shown to have a classical analogue in which some tori in phase space are associated with a symme
Externí odkaz:
http://arxiv.org/abs/chao-dyn/9608015
Publikováno v:
J. Phys. A: Math. Gen. 29 no. 17 (1996) 5441-5453
We study the effect on quantum spectra of the existence of small circular disks in a billiard system. In the limit where the disk radii vanish there is no effect, however this limit is approached very slowly so that even very small radii have compara
Externí odkaz:
http://arxiv.org/abs/chao-dyn/9602017
Autor:
Lauritzen, B., Whelan, N. D.
Publikováno v:
Ann. Phys. 244 (1995), p.112.
We present a semiclassical expansion of the smooth part of the density of states in potentials with some form of symmetry. The density of states of each irreducible representation is separately evaluated using the Wigner transforms of the projection
Externí odkaz:
http://arxiv.org/abs/chao-dyn/9501024
Autor:
Whelan, N. D.
Publikováno v:
Nucl.Phys. A586 (1995) 35-52
Spectrum generating algebras are used in various fields of physics as models to determine quantum structure, including energy levels and transition strengths. The advantage of such models is that their group structure allows an extensive understandin
Externí odkaz:
http://arxiv.org/abs/nucl-th/9412002