Quantum Spin-Tunneling:A Path Integral Approach
作者： R. Schilling
DOI: 10.1007/978-94-011-0403-6_3
关键词:
摘要: We investigate the quantum tunneling of a large spin in crystal field and an external magnetic field. The twofold degeneracy corresponding classical ground state is removed due to tunneling. tunnel splitting ΔE o calculated by use path integral formalism. It shown that coherent integrals do not yield reasonable result. However “bosonlzation” system yields excellent results semiclassical limit. This result follows from approach replacing number s + 1/2 which causes renormalization preexponential factor .
springer.com
sci-hub.st 参考文章(49)
Abraham Klein, Ching Teh Li, Wentzel-Kramers-Brillouin Quantization of Pseudospin Hamiltonians Physical Review Letters. ,vol. 46, pp. 895- 898 ,(1981) , 10.1103/PHYSREVLETT.46.895
Albert Roach Hibbs, Richard Phillips Feynman, Quantum Mechanics and Path Integrals ,(1965)
L. Gunther, Quantum Tunneling of Magnetization Magnetic Properties of Fine Particles. pp. 153- 165 ,(1993) , 10.1007/978-94-011-2054-8_15
Elliott H. Lieb, The Classical Limit of Quantum Spin Systems Communications in Mathematical Physics. ,vol. 31, pp. 327- 340 ,(1973) , 10.1007/BF01646493
J. L. van Hemmen, W. F. Wreszinski, Universal upper bound for the tunneling rate of a large quantum spin Communications in Mathematical Physics. ,vol. 119, pp. 213- 219 ,(1988) , 10.1007/BF01217739
Anupam Garg, Gwang‐Hee Kim, Macroscopic quantum tunneling of the total magnetization in small ferromagnetic grains Journal of Applied Physics. ,vol. 67, pp. 5669- 5671 ,(1990) , 10.1063/1.345921
Anupam Garg, Gwang-Hee Kim, Magnetoelastic dissipation in macroscopic magnetization tunneling. Physical Review B. ,vol. 43, pp. 712- 718 ,(1991) , 10.1103/PHYSREVB.43.712
E. Pytte, K. W. H. Stevens, Tunneling Model of Phase Changes in Tetragonal Rare-Earth Crystals Physical Review Letters. ,vol. 27, pp. 862- 865 ,(1971) , 10.1103/PHYSREVLETT.27.862
H. J. Mikeska, Soliton energy in an easy-plane quantum spin chain Physical Review B. ,vol. 26, pp. 5213- 5222 ,(1982) , 10.1103/PHYSREVB.26.5213
E. M. Chudnovsky, L. Gunther, Quantum theory of nucleation in ferromagnets. Physical Review B. ,vol. 37, pp. 9455- 9459 ,(1988) , 10.1103/PHYSREVB.37.9455