For example, Anders Lustgarten's highly entertaining adaptation for the Red Ladder company of David Peace's novel The Damned United is doubly site-specific.
Naturally this is a trivial limit that is typically not reached in experiments, and we go beyond this below by considering situations where the amplitude for particles to be found on neighbouring sites is non-zero in the initial state, and light scattering can lead to the formation of pairs consisting of a doubly occupied site and a hole (unoccupied site).
This mechanism provides a compelling rationale for obligatory H2 formation during N2 reduction: the transient formation of a state in which an electrostatically activated N2 is bound to a highly activated, doubly reduced site, thereby generating a state optimally activated to carry out the initial hydrogenations of N2, the most difficult process in N2 fixation.
(a) Time-evolution of the probability of doubly occupied sites after a single spontaneous emission in the center of a 48 site system with.
M. A. Yang, A.-S. Malaspinas, E. Y. Durand, and M. Slatkin, Using the doubly-conditioned site frequency spectrum to distinguish between alternative demographic models.
There we plot the time-evolution of the number of doubly occupied sites as a function of time.
The low-lying excitations can then be described as correlated pairs of holes ("holons") and doubly occupied sites ("doublons") [26, 32].
Assuming that the state of the system remains close to the Mott insulator state with, then with conservation of total particle number, the lowest-order excitations will be given by combinations of doubly occupied sites (sometimes referred to as population of particles in a second Mott Band), and holes (in the lowest Mott Band).
In the paramagnetic phase of the infinite-dimensional Hubbard model, the spectral function has a three peak structure with an upper and a lower Hubbard band, corresponding to empty and doubly occupied sites, respectively, and a quasiparticle peak with integrated spectral weight (mathcal{Z}) between the bands [19].
Moreover, because recombination between the lox66 and lox71 sites results in a doubly mutant lox site that can no longer efficiently bind Cre or undergo recombination, the post-RMCE allele is predicted to remain stable in the presence of Cre (Araki et al., 1997).
However, based on the assumption that the total number of doubly-occupied sites and holes remains low we will neglect these terms, as was originally done in Ref. [26].
