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HgTe quantum wells above a critical thickness are 2-dimensional topological insulators. The most prominent signature of the non-trivial topology in these systems is the occurrence of the quantum spin Hall effect when the Fermi energy is located inside the bulk band gap. We will present the main...
The spectra for 7 different samples display double peaks, which are attributed to monolayer fluctuations in the average thickness of the quantum wells. The peak splittings vary systematically with PL energy gap ( E p ), and are accurately reproduced by orientation-dependent band structure ...
However, to date the quantum spin Hall (QSH) effect of existing 2D TIs occurs only at very low-temperatures, below 10 K for HgTe/CdTe7 and InAs/GaSb10 quantum wells and below 10−2 K for graphene11,12, due to the small band gaps. Therefore, the search for 2D TIs with large...
HgTe/Cd0.735Hg0.265Te nanostructures with HgTe quantum wells 16.2 and 21.0 nm thick are grown without additional doping on (013)CdTe/ZnTe/GaAs substrates by the method of molecular beam epitaxy. The compositions and thicknesses of the wide-gap layer and quantum well in the course of growth are...
Hughes, 1 Shou-Cheng Zhang 1 *We show that the quantum spin Hall (QSH) effect, a state of matter with topological propertiesdistinct from those of conventional insulators, can be realized in mercury telluride–cadmiumtelluride semiconductor quantum wells. When the thickness of the quantum well ...
A two-band tight-binding model was used to analyze the absorption data and identify the quantum transitions. The observation of both light-hole and heavy-hole transitions allowed the determination of both the superlattice band gap and the valence-band offset. The offset was found to be 300 meV...
-tures where some degree of interfacial cation mixing was confirmed [11]. So it wasclearly not possible to make atomically abrupt quantum wells with this systemalthough it was later to be found that core-shell HgTe/CdS did appear to be pos-sibletosynthesise[12]. Of course this may in ...
The magnetoabsorption and interband photoconductivity spectra of HgTe/CdHgTe quantum wells exhibiting p -type conductivity are studied at different temperatures. It is shown that, for a sample with a normal band structure, the long-wavelength edge of the spectra shifts to higher energies with ...
quantum wellsspin-orbit interactionWe study quantum transport in HgTe/HgCdTe quantum wells under the condition that the chemical potential is located outside of the band gap. We first analyze symmetry properties of the effective Bernevig–Hughes–Zhang Hamiltonian and the relevant symmetry-breaking ...