Hyper-Poisson Photon Statistics

Magnetic particles and strings in iron langasite

“…As the magnetic field increases further, the domain wall energy becomes negative and the domain walls form a periodic array with the period that decreases with the field. This state is similar to the 'mixed state' in collinear antiferromagnets [43], except that in our case n rotates through the angle 2π across the wall, since the states with n parallel and antiparallel to ẑ have different energies for K 1 = 0. At the second critical field, H c2 , the transition between the DWA and TS states occurs and the modulation direction, described by ξ, rotates abruptly through 90 • .…”

“…the magnetic field of ∼ 4 T [38] and another with a constant ψ and n rotating along a direction perpendicular to the field vector. The latter state is similar to the periodic array of domain walls ('mixed state') predicted for collinear chiral antiferromagnets near the flop transition [43]. Here, we use the effective model Eq.…”

“…where H x. Equation ( 12) resembles the energy of a collinear chiral antiferromagnet [43], except for the form of the LI and the 'internal magnetic field' ∝ K 1 .…”

Skyrmion-driven topological Hall effect in a Shastry-Sutherland magnet

“…Introduction.-With the experimental observation of a skyrmion lattice in three-dimensional helical magnets MnSi 1 , Fe 1−x Co x Si 2 , and thin films of FeGe 3 , significant attention has been paid to systematic study of noncollinear magnetic states and associated magnetoelectric phenomena, where magnetic skyrmions play a prominent role [4][5][6][7] . Analogous to a topologically protected field-theoretical solution due to Skyrme 8,9 the stability of this particle-like spin texture is guaranteed by topological arguments, making it immune to smooth perturbations [10][11][12] . In chiral magnets, skyrmions are stabilized due to a delicate interplay between direct exchange, favoring collinear ordering, and asymmetric exchange known as Dzyaloshinskii-Moriya interaction (DMI) that results in spin canting 4,5 .…”

Steering of the Skyrmion Hall Angle By Gate Voltage

“…In crystals lacking spatial inversion symmetry, the interplay of Heisenberg exchange interaction, antisymmetric Dzyaloshinskii-Moriya interaction, and an external Zeeman field may lead to the formation of vortexlike magnetic SKs. They have been predicted [2][3][4] years before they were experimentally discovered in magnetic layers with a strong spin-orbit interaction [1,5,6].…”