f-band condensates in exciton-polariton lattice systems

Abstract

We report the condensation of microcavity exciton-polaritons at points located on the boundary between the third and higher Brillouin zones in hexagonal lattices: triangular and honeycomb geometries. We collect experimental evidence that supports the finite momentum condensation: (1) the coherent Bragg peaks formed at nonzero points; (2) the nonlinear intensity increase in the exciton-polariton emission at quantum degeneracy threshold; (3) the spectral linewidth behavior: narrowing near threshold and broadening above threshold; and (4) the equivalent 4f y 3 −3x 2 y -like orbital symmetry in real space. The f -orbital state at points appears as a metastable momentum valley to trap exciton-polaritons, which is explained by single-particle band-structure calculations.

Anomalous critical point behavior in dilute magnetic semiconductor (Ca,Na)(Zn,Yu1, Liu2, Zhao3 et al. 2020Phys. Rev. Materials4160View full textAdd to dashboardCite

“…We now turn to the results obtained for sample with higher Mn content, (Ca 0.9 Na 0.1 )(Zn 0.85 Mn 0.15 ) 2 Sb 2 . Figure 5 show the magnetization results obtained for this specimen, plotted with theoretical critical exponents (see Table I) for the standard mean-field, 3D-Heisenberg, 3D-Ising, and tricritical mean-field models, respectively [37]. It is surprising that only the standard mean-field model in Figure 5 Figure 5(f), we plot NS as a function of temperature for all four models.…”

Unconventional critical behavior in the quasi-one-dimensional S=1 chain NiTe2O5

“…In addition, the Ni 2+ spins also have transverse component ⊥ by canting away from the chain direction and the ⊥ are arranged with left-right-rightleft configuration along the chain as shown in Figure 3 show a clear discrepancy with the conventional universality class of 3D Ising ( ′ = 0.11 and = 0.33 ) and 3D Heisenberg ( ′ = 0.12 and = 0.36 ). The unconventional critical behavior has been observed in the two-dimensional magnet within a window 0.1 ≤ ≤ 0.25 [26], near the tricritical point of La0.6Ca0.4MnO3 with = 0.25 [27], and in a twodimensional conductor with = 1 [28], etc. However, understanding of the unconventional critical behaviors in the one-dimensional system is still unclear, and further experimental and theoretical studies are required.…”

Green’s function methods for single molecule junctions

“…For example, inelastic transport can be addressed by treating the electron-vibration coupling perturbatively within the Born approximation; 152 and inelastic current noise has also been treated within a similar set of considerations. 153,154 A method treating electronvibration interactions exactly in single electron scattering problems was introduced in Refs. 155 and 156 and later applied to the description of cooperative effects in inelastic tunneling.…”