Exchange enhancement of the electron g-factor in a two-dimensional semimetal in HgTe quantum wells

Rashba Spin Splitting in HgCdTe Quantum Wells with Inverted and Normal Band Structures

“…The importance of the experimental determination of the effective mass and g -factor in systems with a sophisticated dispersion law, to which the structures based on HgTe belong, is beyond doubt. The previously obtained experimental values of the g- factor and effective mass for HgTe quantum wells are contradictory and depend on the width of the quantum well and the electron density [ 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 ]. It was previously noted [ 39 , 40 , 41 , 42 ] that there is a problem of accordance between theoretical and experimental estimates of the effective mass in such QWs.…”

“…It was previously noted [ 39 , 40 , 41 , 42 ] that there is a problem of accordance between theoretical and experimental estimates of the effective mass in such QWs. If we systematize the currently available numerous experimental estimates of the effective mass in QWs based on HgTe, it is shown that with an increase in the density of charge carriers from ~2 × 10 15 m −2 to ~1 × 10 16 m −2 increases from ~0.020 to (0.026–0.034) (see, for example, [ 42 , 43 , 44 , 46 ]). In the structures with a normal spectrum, the experimental values of the effective mass are close those calculated by the kP method over the whole density range; with the increasing QW width, in an inverted spectrum regime, the experimental values of effective mass become noticeably smaller than the calculated ones [ 42 ].…”

Anisotropy of the in-plane g -factor of electrons in HgTe quantum wells

“…At d = d c , the linear in quasimomentum (k) gapless spectrum is realised. Experimentally, the g-factor and its anisotropy was investigated in the structures both with normal and with "inverted" spectrum grown on substrates of different orientations [7][8][9][10][11]. In all the cases it was assumed that the in-plane g-factor (g ) is isotropic.…”