Zobrazeno 1 - 10
of 254
pro vyhledávání: '"Hamer, C. J."'
Autor:
Radhanpura, K., Hargreaves, S., Lewis, R. A., Krüger, H., Rey, E., Si, P. -Z., Söhnel, T., Jovic, V., Metson, J. B., Waterhouse, G. I. N., Abiona, A. A., Kemp, W. J., Byrne, A. P., Ridgeway, M. C., Timmers, H., Cashion, J. D., Gates, W. P., Greaves, T. L., Dorjkhaidav, O., Constable, E., Gladkis, L. G., Scarvell, J. M., Smith, P. N., Hamer, C. J., Rojas, O., Oitmaa, J., Hillman, B., Norén, L., Goossens, D. J., Kessler, P., Vianden, R., Leslie, J. W., Kluth, P., Liu, Y., Malik, A. E., Hutchison, W. D., Nishimura, K., Elliman, R. G., Harris, A. Brooks, Sushkov, O. P., Warner, J. A., Kiss, A. E., Young, J., O'Brien, C. C., Micolich, A. P.
The 35th Australian/New Zealand Annual Condensed Matter and Materials Meeting was held at the Charles Sturt University campus in Wagga Wagga, NSW, Australia from the 1st to the 4th of February 2011. The conference was attended by 92 delegates from a
Externí odkaz:
http://arxiv.org/abs/1107.3617
We study a frustrated 3D antiferromagnet of stacked $J_1 - J_2$ layers. The intermediate 'quantum spin liquid' phase, present in the 2D case, narrows with increasing interlayer coupling and vanishes at a triple point. Beyond this there is a direct fi
Externí odkaz:
http://arxiv.org/abs/1103.1679
Autor:
Oitmaa, J., Hamer, C. J.
We use high-temperature series expansions to obtain thermodynamic properties of the quantum compass model, and to investigate the phase transition on the square and simple cubic lattices. On the square lattice we obtain evidence for a phase transitio
Externí odkaz:
http://arxiv.org/abs/1010.3804
Autor:
Hamer, C. J.
The energy spectrum of the two-magnon bound states in the Heisenberg-Ising antiferromagnet on the square lattice are calculated using series expansion methods. The results confirm an earlier spin-wave prediction of Oguchi and Ishikawa, that the bound
Externí odkaz:
http://arxiv.org/abs/0904.4085
Autor:
Hamer, C. J.
We review the theoretical behaviour of the total and one-particle structure factors at a quantum phase transition for temperature T=0. The predictions are compared with exact or numerical results for the transverse Ising model, the alternating Heisen
Externí odkaz:
http://arxiv.org/abs/0809.2857
Autor:
Collins, A., Hamer, C. J.
The S=1/2 Heisenberg bilayer spin model at zero temperature is studied in the dimerized phase using analytic triplet-wave expansions and dimer series expansions. The occurrence of two-triplon bound states in the S=0 and S=1 channels, and antibound st
Externí odkaz:
http://arxiv.org/abs/0806.0694
Autor:
Oitmaa, J., Hamer, C. J.
We calculate ground state properties (energy, magnetization, susceptibility) and one-particle spectra for the $S = 1$ Heisenberg antiferromagnet with easy-axis or easy-plane single site anisotropy, on the square lattice. Series expansions are used, i
Externí odkaz:
http://arxiv.org/abs/0804.1171
We investigate the critical behaviour of the spectral weight of a single quasiparticle, one of the key observables in experiment, for the particular case of the transverse Ising model.Series expansions are calculated for the linear chain and the squa
Externí odkaz:
http://arxiv.org/abs/cond-mat/0607589
An alternative triplet-wave expansion formalism for dimerized spin systems is presented, a modification of the 'bond operator' formalism of Sachdev and Bhatt. Projection operators are used to confine the system to the physical subspace, rather than c
Externí odkaz:
http://arxiv.org/abs/cond-mat/0605724
Publikováno v:
Phys. Rev. B 73, 144508 (2006)
The phase diagram of the two-leg t-Jz ladder is explored, using the density matrix renormalization group method. Results are obtained for energy gaps, electron density profiles and correlation functions for the half-filled and quarter-filled cases. T
Externí odkaz:
http://arxiv.org/abs/cond-mat/0511528