Layer and doping tunable ferromagnetic order in two-dimensional CrS2 layers

Ferromagnetic two-dimensional crystals: Single layers of K2CuF4

Tunable two-dimensional or three-dimensional electron gases by submonolayer La doping of SrTiO3

First-principles calculation was used to study the structural and electronic features of the low-dimensional oxide structure, SrTiO3/Sr1−xLaxTiO3 (x= 0.25) superlattices, constructed by submonolayer low-dimensional La doping into SrTiO3. We demonstrate a dimensionality crossover from three-dimensional (3D) to two-dimensional (2D) electronic behavior in the system. Two types of carriers, one con...

Ferromagnetic Nanoclusters in two-dimensional He

He adsorbed on graphite is an almost ideal two dimensional (2D) fermionic system. The 2D solid, where the interaction between the nuclear spins S = 1 2 is due to multiple spin exchange, has been extensively studied as a model system for strongly interacting fermions in 2D. At high densities in the second layer, three body exchange dominates and leads to Heisenberg ferromagnetism. We report on N...

Two-dimensional kagome correlations and field induced order in the ferromagnetic XY pyrochlore Yb2Ti2O7.

Neutron scattering measurements show the ferromagnetic XY pyrochlore Yb2Ti2O7 to display strong quasi-two-dimensional (2D) spin correlations at low temperature, which give way to long range order (LRO) under the application of modest magnetic fields. Rods of scattering along 111 directions due to these 2D spin correlations imply a magnetic decomposition of the cubic pyrochlore system into decou...

Tunable two-dimensional femtosecond spectroscopy.

We have developed a two-dimensional (2D) Fourier-transform femtosecond spectroscopy technique for the visible spectral region. Three-pulse photon echo signals are generated in a phase-matched noncollinear four-wave mixing box geometry that employs a 3-kHz repetition-rate laser system and optical parametric amplification. Nonlinear signals are fully characterized in amplitude and phase by spectr...