Long-range interaction between distant spins is an important building block for the realization of a large quantum-dot network in which couplings pairs can be selectively addressed. Recent experiments on coherent oscillation logical states remote facilitated by intermediate electron were first step large-scale quantum information processing. Reaching this ultimate goal requires extensive studie...

Weak antiferromagnetic (AFM) interaction in the ferromagnetic (FM) partially ordered La 2 CoMnO 6 (LCMO) was detected by Raman spectroscopy monitoring spin-phonon coupling. Because of sensibility to probe short-range disorder and lattice modifications, showed be an useful tool indicate less remarkable magnetic transitions LCMO compound. Apart from expected coupling due long-range FM superexchan...

We construct a microscopic model based on superexchange theory for moir\'e bilayer in chromium trihalides (Cr$X_3$, $X=$Br, I). In particular, we derive analytically the interlayer Heisenberg exchange and Dzyaloshinskii-Moriya interaction with arbitrary distances (x) between spins. Importantly, our takes into account sliding twisting geometries $X$-$X$ hopping processes. Our approach can direct...

Type one (T1) Cu sites deliver electrons to catalytic Cu active sites: the mononuclear type two (T2) Cu site in nitrite reductases (NiRs) and the trinuclear Cu cluster in the multicopper oxidases (MCOs). The T1 Cu and the remote catalytic sites are connected via a Cys-His intramolecular electron-transfer (ET) bridge, which contains two potential ET pathways: P1 through the protein backbone and ...

We present a microscopic model for α′-NaV2O5. Using an extended Hubbard model for the vanadium layers we derive an effective low-energy model consisting of pseudospin Ising chains and Heisenberg chains coupled to each other. We find a “spin-Peierls-Ising” phase transition which causes charge ordering on every second ladder and superexchange alternation on the other ladders. This transition can ...

We demonstrate that magnetic vortices in which spins are coupled to polar lattice distortions via superexchange exhibit an unusually large linear magnetoelectric response. We show that the periodic arrays of vortices formed by frustrated spins on kagome lattices provide a realization of this concept; our ab initio calculations for such a model structure yield a magnetoelectric coefficient that ...