نتایج جستجو برای: boson system

تعداد نتایج: 2244675  

2008
Nicolae Angelescu Robert A. Minlos Jean Ruiz Valentin A. Zagrebnov

We study the structure of the spectrum of a two-level quantum system weakly coupled to a boson field (spin-boson model). Our analysis allows to avoid the cutoff in the number of bosons, if their spectrum is bounded below by a positive constant. We show that, for small coupling constant, the lower part of the spectrum of the spin-boson Hamiltonian contains (one or two) isolated eigenvalues and (...

رمضانعلی سبیلی, , محمد ابراهیم زمردیان, ,

One of the most interesting properties of boson gases is that under special conditions, there is a possibility of a phase transition, in a critical temperature  below  which  all bosons condensate into  the ground state. This phenomenon is called Bose – Einstein Condensation (BEC). In  this paper, we investigate BEC in a harmonic oscillator trap. We conclude that, in contrast to a free boson ga...

2009
D. A. Trifonov

Coherent states (CS) for non-Hermitian systems are introduced as eigenstates of pseudo-Hermitian boson annihilation operators. The set of these CS includes two subsets which form bi-normalized and bi-overcomplete system of states. The subsets consist of eigenstates of two complementary lowering pseudo-Hermitian boson operators. Explicit constructions are provided on the example of one-parameter...

Journal: :Journal of Physical Studies 2012

Journal: :Journal of Functional Analysis 2014

Journal: :Progress of Theoretical Physics 1990

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