Spin-orbit splitting of valence and conduction bands in HgTe quantum wells near the Dirac point

Abstract

Energy spectra both of the conduction and valence bands of the HgTe quantum wells with a width close to the Dirac point were studied experimentally. Simultaneous analysis of the Shubnikov-de Haas oscillations and Hall effect over a wide range of electron and hole densities gives surprising result: the top of the valence band is strongly split by spin-orbit interaction while the splitting of the conduction band is absent, within experimental accuracy. Astonishingly, but such a ratio of the splitting values is observed as for structures with normal spectrum so for structures with inverted one. These results do not consistent with the results of kP calculations, in which the smooth electric filed across the quantum well is only reckoned in. It is shown that taking into account the asymmetry of the quantum well interfaces within a tight-binding method gives reasonable agreement with the experimental data.

10 pages, 16 figures

References in corpus (5)

• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Split Dirac cones in HgTe/CdTe quantum wells due to symmetry-enforced level anticrossing at interfaces
• Hole transport and valence band dispersion law in a HgTe quantum well with normal energy spectrum
• Weak antilocalization of holes in HgTe quantum wells with a normal energy spectrum

Cited by in corpus (25)

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• The valence band energy spectrum of HgTe quantum wells with inverted band structures
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• Helical edge transport in the presence of a magnetic impurity
• Topological insulators based on HgTe
• Helical edge transport in the presence of a magnetic impurity: the role of local anisotropy
• Indirect exchange interaction between magnetic impurities in the two-dimensional topological insulator based on CdTe/HgTe/CdTe quantum wells
• Band structure of a HgTe-based three-dimensional topological insulator
• Landau level spectroscopy of valence bands in HgTe quantum wells: Effects of symmetry lowering
• Unconventional Reentrant Quantum Hall Effect in a HgTe/CdHgTe Double Quantum Well
• Renormalization of the conduction band spectrum in HgTe quantum wells by electron-electron interaction
• Band Structure of Two-dimensional Dirac Semimetal from Cyclotron Resonance
• Finite frequency backscattering current noise at a helical edge
• Many-particle effects in optical transitions from zero-mode Landau levels in HgTe quantum wells
• Splitting of Dirac cones in HgTe quantum wells: Effects of crystallographic orientation, interface-, bulk-, and structure-inversion asymmetry
• Aniotropy of in-plane g-factor of electrons in HgTe quantum wells
• Dresselhaus spin-orbit interaction in the p-AlGaAs/GaAs/AlGaAs structure with a square quantum well: Surface Acoustic Waves Study
• Spin-orbit splitting of the conduction band in HgTe quantum wells: role of different mechanisms
• Quantum oscillations of transport coefficients and capacitance: an unexpected manifestation of the spin-Hall effect
• Zeeman splitting of conduction band in HgTe quantum wells near the Dirac point
• Density of states measurements for heavy subband of holes in HgTe quantum wells
• Universal transparency and fine band structure near the Dirac point in HgTe quantum wells
• Effects of electron-hole asymmetry on electronic structure of helical edge states in HgTe/HgCdTe quantum wells
• Energy spectrum of valence band in HgTe quantum wells on the way from a two to the three dimensional topological insulator