Spin–orbit coupling and weak antilocalization in the thermoelectric material $\beta $ -K₂Bi₈Se₁₃

Abstract

We have studied the effect of spin-orbital coupling (SOC) on electronic transport properties of the thermoelectric material -K2Bi8Se13 via magnetoresistance (MR) measurements. We found that the strong SOC in this material results in weak antilocalization (WAL) effect, which can be well described by the three-dimensional weak localization model. The phase coherence length extracted from theoretical fitting exhibits a power-law temperature dependence with an exponent around 2.1, indicating that the electron phase dephasing is governed by electron -transverse phonon interactions. Like in topological insulators, the WAL effect in -K 2 Bi 8 Se 13 can be quenched by magnetic impurities (Mn) but is robust against nonmagnetic impurities (Te). Although our magnetotransport studies do not provide any evidences for topological surface states, our analyses suggest that SOC plays an important role in determining thermoelectric properties of -K2Bi8Se13.

Weak antilocalization and Shubnikov-de Haas oscillations in CaCuSb single crystal

“…It should be noted that both the Cu and Sb atoms have large SOC which splits the Sb p xy states, leading to two-hole pockets at the Γ-point. Thus, while the system is topologically trivial, due to inherent large SOC, it can show WAL as seen in our experiments as well as reported widely in other materials [49][50][51] .…”

Large linear magnetoresistance in heavily-doped Nb:SrTiO3 epitaxial thin films

“…In the three dimensional WAL, MR can be described by Fukuyama-Hoshino (FH) model 37 38 39 which is expressed as the following equation (Eq. (1)).…”

“…B ϕ is the characteristic dephasing field given by B i + 2 B S . Assuming that the measured MR is given by a sum of Δ ρ WAL and the classical MR (Δ ρ orb ~ B 2 ) due to Lorentz effect 38 , we have fitted the observed MR as shown in Fig. 3(f) .…”

Kondo effect with tunable spin–orbit interaction in LaTiO3/CeTiO3/SrTiO3 heterostructure

“…Thus, 2 dependence of MR at higher fields suggests the contribution of classical MR as well. MR due to classical orbital MR follows Kohler's rule, ∆ □ (0) ⁄ = ( □ (0) ⁄ ) 2 [51][52][53]. Kohler's plot for the doped samples at 2K is shown in the inset of figure 6(a).…”