Author Publications

2006

Caspers, W.J. and Labuz, M. and Wal, A. (2006) On the completeness of the set of Bethe-Hulth´en solutions of the linear Heisenberg system. Journal of Physics: Conference Series, 30 . pp. 73-85. ISSN 1742-6588

2003

Caspers, W.J. and Lulek, T. and Lulek, B. and Wal, A. (2003) Towards a general solution to the linear Heisenberg problem. pp. 224-240.

1999

Wessels, P.P.F. and Caspers, W.J. and Wiegel, F.W. (1999) Discretizing the one-dimensional Dirac equation. Europhysics Letters, 46 (2). pp. 123-126. ISSN 0295-5075

1998

Caspers, W.J. and Kuzma, M. and Lulek, B. and Lulek, T. (1998) Magnons in the Heisenberg model with a dynamical scaling symmetry. Physica A: Theoretical and statistical physics, 252 (3-4). pp. 477-487. ISSN 0378-4371

1997

Tielen, G.J. and Lulek, T. and Traa, M.R.M.J. and Kuzma, M. and Caspers, W.J. (1997) The role of the Manhattan distance in antiferromagnetic ordering. Physica A: Theoretical and statistical physics, 246 (1-2). pp. 199-220. ISSN 0378-4371

1995

Elout, M.O. and Traa, M.R.M.J. and Caspers, W.J. (1995) Approximations to the two-hole ground state of the Hubbard-Anderson model: a numerical test. Physica A: Theoretical and statistical physics, 215 (1-2). pp. 152-169. ISSN 0378-4371

1994

Traa, M.R.M.J. and Caspers, W.J. (1994) Effective Hamiltonian for the motion of holes in the Hubbard-Anderson model. Physica A: Theoretical and statistical physics, 203 (3-4). pp. 583-599. ISSN 0378-4371

Traa, M.R.M.J. and Caspers, W.J. and Banning, E.J. (1994) The two-hole ground state of the Hubbard-Anderson model, approximated by a variational RVB-type wave function. Physica A: Theoretical and statistical physics, 203 (1). pp. 145-158. ISSN 0378-4371

1992

Traa, M.R.M.J. and Caspers, W.J. (1992) Symmetry breaking in the Anderson-Hubbard model. Physica A: Theoretical and statistical physics, 183 (1-2). pp. 175-186. ISSN 0378-4371

1991

Tielen, G.I. and Iske, P.L. and Caspers, W.J. (1991) A thermodynamic approximation of the ground state of antiferromagnetic heisenberg spin−1/2 lattices. Physica A: Theoretical and statistical physics, 173 (3). pp. 507-521. ISSN 0378-4371

Zandvliet, H.J.W. and Caspers, W.J. and Silfhout van, A. (1991) Order-disorder phase transition of the Ge(001) surface. Solid State Communications, 78 (5). pp. 455-458. ISSN 0038-1098

1989

Caspers, W.J. (1989) Completeness of singlet pair states for quantum spin systems. Physics Letters A, 141 (5-6). pp. 303-306. ISSN 0375-9601

Caspers, W.J. and Iske, P.L. (1989) Exact spectrum for n electrons in the single band Hubbard model. Physica A: Theoretical and statistical physics, 157 (2). pp. 1033-1041. ISSN 0378-4371

1987

Iske, P.L. and Caspers, W.J. (1987) A mechanism for symmetry breaking in antiferromagnetic Heisenberg systems. Physica A, 142 (1-3). pp. 360-373. ISSN 0378-4371

Iske, P.L. and Caspers, W.J. (1987) Elementary excitations in antiferromagnetic Heisenberg systems. Physica A, 146 (1-2). pp. 151-174. ISSN 0378-4371

1986

Caspers, W.J. and Tielen, G.I. (1986) Rotational ordering and symmetry breaking in the triangular antiferromagnetic Heisenberg lattice. Physica A, 135 (2-3). pp. 519-532. ISSN 0378-4371

1985

Caspers, W.J. and Magnus, W. (1985) Competitive forms of symmetry breaking in linear antiferromagnetic systems. Physica A: Theoretical and statistical physics, 130 (1-2). pp. 155-170. ISSN 0378-4371

1984

Caspers, W.J. and Emmett, K.M. and Magnus, W. (1984) The Majumdar-Ghosh chain. Twofold ground state and elementary excitations. Journal of Physics A: Mathematical and General, 17 (13). p. 2687. ISSN 1751-8113

1983

Caspers, W.J. and Magnus, W. (1983) On the existence of a gap in the energy spectrum of quantum systems. Journal of Physics C: Solid state physics, 16 (33). p. 6395. ISSN 0022-3719

Caspers, W.J. and Magnus, W. (1983) Exact ground states for a class of linear quantum spin systems. Physica A: Theoretical and statistical physics, 119 (1-2). pp. 291-294. ISSN 0378-4371

1982

Caspers, W.J. (1982) Exact ground states for a class of linear antiferromagnetic spin systems. Physica A: Theoretical and statistical physics, 115 (1-2). pp. 275-280. ISSN 0378-4371

Caspers, W.J. and Magnus, W. (1982) Some exact excited states in a linear antiferromagnetic spin system. Physics Letters A, 88 (2). pp. 103-105. ISSN 0375-9601

1980

Broek van den, P.M. and Caspers, W.J. and Willemse, M.W.M. (1980) Ground state energies of antiferromagnetic lattices. Physica A: Theoretical and statistical physics, 104 (1-2). pp. 298-308. ISSN 0378-4371

Caspers, W.J. (1980) Renormalization techniques for quantum spin systems. Ground-state energies. Physics Reports, 63 (4). pp. 223-263. ISSN 0370-1573

1979

Braak van de, H.P. and Caspers, W.J. and Gragert, P.K.H. and Willemse, M.W.M. (1979) An upper bound for the ground-state energy of an antiferromagnetic chain with next-nearest-neighbor interaction. Journal of statistical physics, 20 (5). pp. 487-497. ISSN 0022-4715

1978

Braak van de, H.P. and Caspers, W.J. and Wiegel, F.W. and Willemse, M.W.M. (1978) An exact limit for the Peierls distortion energy in an antiferromagnetic chain by means of a renormalization procedure. Journal of statistical physics, 18 (6). pp. 577-584. ISSN 0022-4715

Braak van de, H.P. and Caspers, W.J. and Willemse, M.W.M. (1978) An exact upper bound for the ground-state energy of the triangular antiferromagnetic lattice by means of a renormalization procedure. Physics Letters A, 67 (2). pp. 147-148. ISSN 0375-9601

1977

Braak van de, H.P. and Caspers, W.J. and Lange de, C. and Willemse, M.W.M. (1977) The determination of the ground-state energy of an antiferromagnetic lattice by means of a renormalization procedure. Physica A: Theoretical and statistical physics, 87 (2). pp. 354-368. ISSN 0378-4371

Hosson de, J.Th.M. and Braak van de, H.P. and Caspers, W.J. (1977) Scattered wave functions of dislocated lattices. Physics letters A, 63 (2). pp. 174-176. ISSN 0375-9601

1974

Valkering, T.P. and Caspers, W.J. (1974) Asymptotic equality of the isolated and the adiabatic susceptibility. Physica, 78 (3). pp. 516-526. ISSN 0031-8914

1973

Valkering, T.P. and Caspers, W.J. (1973) Level crossing and the space of operators commuting with the Hamiltonian. Physica, 63 (1). pp. 113-138. ISSN 0031-8914

1971

Caspers, W.J. and Braak van de, H.P. and Verbeek, P.W. and Verstelle, J.C. (1971) Complete sets of diagonal operators in quantum-statistical mechanics. Physica, 53 (2). pp. 210-224. ISSN 0031-8914

1969

Braak van de, H.P. and Caspers, W.J. (1969) Ground-State Properties of Finite Antiferromagnetic Chains. Physica Status Solidi B: Basic research, 35 (2-3). pp. 933-940. ISSN 0370-1972

Hallers, J.J. and Caspers, W.J. (1969) On the Influence of Conduction Electrons on the Ferroelectric Curie Temperature. Physica Status Solidi B: Basic research, 36 (2). pp. 587-592. ISSN 0370-1972