2014
DOI: 10.1063/1.4867627
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Experimental investigation of spin-orbit coupling in n-type PbTe quantum wells

Abstract: The spin-orbit coupling is studied experimentally in two PbTe quantum wells by means of weak antilocalization effect. Using the Hikami-Larkin-Nagaoka model through a computational global optimization procedure, we extracted the spin-orbit and inelastic scattering times and estimated the strength of the zero field spin-splitting energy Δso. The values of Δso are linearly dependent on the Fermi wave vector (kF) confirming theoretical predictions of the existence of large spin-orbit coupling in IV-VI quantum well… Show more

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Cited by 27 publications
(17 citation statements)
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“…2(d) where a curve fit allows us to determine the parabolic part of the magnetoconductivity at intermediate fields for which WAL is nearly saturated. In both samples, the low field cusp characteristic of weak antilocalization (WAL) is observed at low temperatures, as typically seen in materials with strong spin-orbit coupling 29,30 and topological materials. 31,32,33 The cusp yields a magnetoconductance on the order of e 2 /h while the zero field Drude conductance is on the order of 100-1000e 2 /h (in QW4 𝜎 2𝐷 (0) = 330𝑒 2 /ℎ at 2K) further confirming that it is due to the correction from quantum interference of backscattered electrons.…”
Section: B Electrical Transport Measurementsmentioning
confidence: 74%
“…2(d) where a curve fit allows us to determine the parabolic part of the magnetoconductivity at intermediate fields for which WAL is nearly saturated. In both samples, the low field cusp characteristic of weak antilocalization (WAL) is observed at low temperatures, as typically seen in materials with strong spin-orbit coupling 29,30 and topological materials. 31,32,33 The cusp yields a magnetoconductance on the order of e 2 /h while the zero field Drude conductance is on the order of 100-1000e 2 /h (in QW4 𝜎 2𝐷 (0) = 330𝑒 2 /ℎ at 2K) further confirming that it is due to the correction from quantum interference of backscattered electrons.…”
Section: B Electrical Transport Measurementsmentioning
confidence: 74%
“…The numerical fits of the data in Fig. 3 to equation (1) were realized using the Monte-Carlo based cross-entropy method 26 27 ( Supplementary Section 4 ), which is well-adapted to non-linear multi-extremal optimization problems in a multi-parameter space. Figure 3 shows an excellent correspondence between the data and Eq.…”
Section: Resultsmentioning
confidence: 99%
“…Recently, the evaluation of the spin-relaxation length using the HLN formula has become a very important topic in the field of spintronics and topological materials sciences [2,3,4,5]. However, most target materials in these fields possess strong SOC in the atoms that constitute the lattice, and not the impurities, e.g., Bi film with non SOC impurities [Fig.…”
Section: Introductionmentioning
confidence: 99%