Spin polarization of polaron in quasi-one dimensional organic system

Abstract

The spin polarization of polarons in quasi-1D organic materials has been investigated by using the extended Su–Schrieffer–Heeger (SSH) model with spin-orbit coupling. Results show that the polaron is partly spin polarized, and that the electron–electron interaction and spin-orbit coupling compete with each other during the formation of spin polarization. The dependence of spin polarization on electron–phonon coupling is also revealed. Our results demonstrate that spin polarization is well correlated with polaron localization, thus providing useful guidance for exploring magnetic effects in organic materials.

Tunable zero modes and quantum interferences in flat-band topological insulators

“…The spin-1/2 SSH chain with spin-orbit interaction [53][54][55][56] is similar to the hourglass CSSH ladder in a certain regime, except for the distribution of magnetic fluxes. The hourglass-CSSH ladder with φ = 0, in its trivial phase, also has the same geometry as certain Cu 2 Te 2 O 5 X 2 compounds with X=Cl, Br [57]; and has been analyzed as a chain of interacting spins [57,58].…”

“…2 (f)], a topological model that is usually studied as a chain of interacting spins [42][43][44][45][46][47][48][49]. The spin-1/2 SSH chain with spin-orbit [50][51][52][53] is isomorphic to the hourglass CSSH ladder when the spin-orbit coupling constants are equal to the tunneling amplitudes. However, it has a different distribution of magnetic fluxes.…”

“…The CSSH topological phase which is easier to implement in this way is the φ = 0 hourglass CSSH ladder. As mentioned above, it is equivalent to the spin-1/2 SSH chain with spin-orbit [50][51][52][53] if the spin-orbit coupling constants are equal to the tunneling amplitudes.…”

Effect of lattice distortion on spin admixture and quantum transport in organic devices with spin–orbit coupling

“…[16] Moreover, the strength of the SOC in organics may be modified by molecular deformation. [17][18][19][20][21] It has been reported that the SOC in biphenyls is increased by four orders of magnitude as the tor-sion angle between the two benzene rings changes. [16] This provides a prerequisite for exploring the SOC effect in organic devices.…”

“…The reported structural deformation in previous theoretical studies is limited to the change of molecular angles or chemical substitution in heterocyclic molecules. [17][18][19][20][21] In organic polymers, a fundamental structural deformation is the lattice dimerization or polaron lattice distortion induced by the strong e-l interaction. These lattice distortions exist universally in organics, which may even bring novel effects for spin transport related to the SOC, such as the oscillation spin Hall effect in organic ladders induced by polaron and bipolaron transport.…”