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Nuclear Physics B - Proceedings Supplements

Hole excitations in quantum antiferromagnets

Efstratios Manousakis

Published May 1, 1991• 2 citations
Publisher
DOI
10.1016/0920-5632(91)91002-2

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No author provided

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A new quantum Bogoliubov-de Gennes (BdeG) formalism is developed to study the self-consistent motion of holes and spin excitations in a quantum antiferromagnet within the generalized t-J model. On the one hand, the effects of local distortion of spin configurations and the renormalization of the hole motion due to virtual excitations of the distorted spin background are treated on an equal footing to obtain the hole wave function and its spectrum, as well as the effective mass for a propagating hole. On the other hand, the change of the spin excitation spectrum and the spin correlations due to the presence of dynamical holes are studied within the same adiabatic approximation. The stability of the hole states with respect to such changes justifies the self-consistency of the proposed formalism.

International Journal of Modern Physics B•Dec 1, 1989•7 citations
We analyze distortions, excitations, and correlations of spins in a quantum antiferromagnet with a dynamic hole, using the hole wave functions obtained by us previously. It is found that spins around the hole are severely distorted and a confining structure is formed. Several localized modes of spin excitations are produced and the lowest one is of s symmetry. The spin fluctuations are very much enhanced due to the hole dynamic effects, in contrast with the static hole case. Our results are compared with those of numerical calculations and other approaches.
We analyze distortions, excitations, and correlations of spins in a quantum antiferromagnet with a dynamic hole, using the hole wave functions obtained by us previously. It is found that spins around the hole are severely distorted and a confining structure is formed. Several localized modes of spin excitations are produced and the lowest one is of s symmetry. The spin fluctuations are very much enhanced due to the hole dynamic effects, in contrast with the static hole case. Our results are compared with those of numerical calculations and other approaches.
A new quantum Bogoliubov-de Gennes (BdeG) formalism is developed to study the self-consistent motion of holes and spin excitations in a quantum antiferromagnet within the generalized t-J model. On the one hand, the effects of local distortion of spin configurations and the renormalization of the hole motion due to virtual excitations of the distorted spin background are treated on an equal footing to obtain the hole wave function and its spectrum, as well as the effective mass for a propagating hole. On the other hand, the change of the spin excitation spectrum and the spin correlations due to the presence of dynamical holes are studied within the same adiabatic approximation. The stability of the hole states with respect to such changes justifies the self-consistency of the proposed formalism.