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Engineering nonlinear optical phenomena by arbitrarily manipulating the phase relationships among the relevant optical fields

11:31 09 julio in Artículos por Website by Consultora CIS

Phase-engineered Raman-resonant four-wave-mixing processFirst, we describe the theoretical framework by which the high-order Rr-FWM process can be engineered by implementing the relative phase manipulations during its evolution. Figure 1d, e represents a Rr-FWM process. In this process, a high-Raman coherence, ${\rho }_{{ab}}$, is adiabatically driven...

Correlated disorder as a way towards robust superconductivity

11:31 07 julio in Artículos por Website by Consultora CIS

The calculations are done using the model of the structural disorder where the spatial correlations of the disorder potential in the inverse space obey the power law$${S}_{V}(q)\propto {q}^{-\alpha }$$ ...

Floquet topological superconductivity induced by chiral many-body interaction

11:31 05 julio in Artículos por Website by Consultora CIS

Low-energy effective HamiltonianWe take in the present study the hole-doped Mott insulator on a square lattice, which is irradiated by an intense circularly-polarised light (CPL). This can be minimally modelled by the repulsive Hubbard model, with a Hamiltonian$$\hat{H}(t)=-\mathop{\sum}\limits_{ij\sigma }{t}_{ij}{e}^{-i{{{{{{{\boldsymbol{A}}}}}}}}(t)\cdot {{{{{{{{\boldsymbol{R}}}}}}}}}_{ij}}{\hat{c}}_{i\sigma }^{{{{\dagger}}} }{\hat{c}}_{j\sigma }+\frac{U}{2}\mathop{\sum}\limits_{i}{\hat{n}}_{i}({\hat{n}}_{i}-1),$$ ...

Linking the network centrality measures closeness and degree

11:31 03 julio in Artículos por Website by Consultora CIS

TheoryGeneral definitionsFor simplicity, we will assume throughout this paper that we are analysing a simple graph ${{{{{{{\mathcal{G}}}}}}}}$ with just one component. We will denote the degree of each node v as kv. A path in a network of length ℓ is a sequence of...

Universal multilayer network exploration by random walk with restart

11:31 01 julio in Artículos por Website by Consultora CIS

Random walk with restart (RWR)Let us consider an irreducible and aperiodic Markov chain, for instance a network composed of a giant component with undirected edges, G = (V, E), where V is the set of vertices and E ⊆ (V × V) is the set of edges. In the case of...

Viscoelastic phase separation in biological cells

11:31 29 junio in Artículos por Website by Consultora CIS

Characteristics of viscoelastic phase separationLet us consider phase separation into two phases with fast and slow dynamics. Below, we explain the essential physics of VPS as intuitively as possible without using any equations. We describe the formal theoretical frame of VPS28,29 in the Methods...