Summary
We estimate the accuracy of the adiabatic approximation in predicting the time evolution of local observables for an XY quantum magnet with a slowly variable external magnetic field. The system evolves according to the natural Hamiltonian dynamics and the spectral gap produced by the magnetic field is assumed to be large with respect to the term inducing quantum fluctutions. The proof is based on a finite order truncation of a time dependent cluster expansion in inverse powers of the time scale τ. In the analytic case, we show that the accuracy of this truncated expansion is of order\(O(e^{ - \alpha e\tau ^{\tfrac{1}{\alpha }} } )\) for any α>1. If the time dependent perturbation is suddenly switched on at time zero and switched off at time τ, the accuracy of the adiabatic approximation is proven to be of orderO(τ −1.
Similar content being viewed by others
References
[A] Albanese, C.: Commun. Math. Phys.134, 1–27 (1990); Commun. Math. Phys.134, 237–272 (1990)
[AF] Albanese, C., Froehlich, J.: ETH-TH preprint, 1993
[BF] Born, M., Fock, V.: Z. Phys.51, 165–169 (1928)
[F] Forster, D.: Hydrodynamic Fluctuations, Broken Symmetry, and Correlation Functions. Reading, MA: Addison-Wesley, 1975
[GJ] Glimm, J., Jaffe, A.: Quantum Physics, a Functional Integral Point of View. Berlin, Heidelberg, New York: Springer, 1987
[K] Kato, T.: J. Phys. Soc. J. Jpn.5, 435 (1950)
[JP] Joye, A., Pfister, C.: Commun. Math. Phys.140, 15 (1991)
Author information
Authors and Affiliations
Additional information
Communicated by Ya. G. Sinai
Rights and permissions
About this article
Cite this article
Albanese, C. The adiabatic approximation for quantum spin systems with a spectral gap. Commun.Math. Phys. 178, 527–540 (1996). https://doi.org/10.1007/BF02108813
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02108813