The electron spin dynamics under variable uniaxial strain is investigated in bulk cubic GaN by time-resolved magneto-optical Kerr-rotation spectroscopy. Spin relaxation is found to be approximately independent of the applied strain, in complete agreement with estimates for Dyakonov-Perel spin relaxation. Our findings clearly exclude strain-induced relaxation as an effective mechanism for spin relaxation in cubic GaN.
We used the two-component epoxy UHU plus endfest 300 from UHU GmbH, Bühl, Germany. Special care was taken in proper glueing of the samples using a homemade press device to achieve thin, uniform epoxy layers. Almost no creep or drift was observed.
Part No. PSt 150/5x5/7 from Piezomechanik Dr. Lutz Pickelmann GmbH, Munich, Germany.
Part No. SGD-1.5/120-LY11 from OMEGA Engineering, Stamford, Connecticut, USA.
The strain values given refer to the average of the strain measured on the back of the piezo and on top of the sample.
Here we corrected for several misprints in the English version of the corresponding section of Ref. 25, including the correct value of and inconsistent use of γ3.
We used the values γe = 0.84 eV Å3, nDisl = 1 × 1010 cm−2 for sample A and nDisl = 2 × 109 cm−2 for sample B, respectively, as well as and for sample A and for sample B, respectively, for the calculation of .