2014年8月

# Spin-boson model through a Poisson-driven stochastic process

MATHEMATISCHE ZEITSCHRIFT
• Masao Hirokawa
• ,
• Fumio Hiroshima
• ,
• Jozsef Lorinczi

277
3-4

1165

1198

DOI
10.1007/s00209-014-1299-1

SPRINGER HEIDELBERG

We give a functional integral representation of the semigroup generated by the spin-boson Hamiltonian by making use of a Poisson point process and a Euclidean field. We present a method of constructing Gibbs path measures indexed by the full real line which can be applied also to more general stochastic processes with jump discontinuities. Using these tools we then show existence and uniqueness of the ground state of the spin-boson, and analyze ground state properties. In particular, we prove super-exponential decay of the number of bosons, Gaussian decay of the field operators, derive expressions for the positive integer, fractional and exponential moments of the field operator, and discuss the field fluctuations in the ground state.

Web of Science ® 被引用回数 : 9

リンク情報
DOI
https://doi.org/10.1007/s00209-014-1299-1
Web of Science