<i>trans</i>-2,5-Dimethylcyclopentane-1,1-dicarboxylic acid

Putten, N. van der; Kops, R. T.; Bode, Juergen; Schenk, H.

doi:10.1107/s0567740878002964

Cited by 2 publications

(1 citation statement)

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“…The RS structure PbTe is stable at 0 K because the s states of the cation participate in the hybridization with a much smaller fraction than that in other IV-VI materials, such as GeS and GeTe in which the crystal structures are more distorted by the s 2 lone pair. 30 calculation (in the following discussion, we label these states A-P 1s, A-P 1p, and A-C1p, respectively). Compared to the corresponding bulk states, a great portion of Pb 6s states transfers from the lowest valence band to the VBM and the s peak at ∼8.0 eV becomes broader, which is similar to the DOS of the GeTe or GeS in a RS structure.…”

Section: B Density Of States At the Twisted Interfacementioning

confidence: 99%

Two-dimensional electron gas at the metastable twisted interfaces of CdTe/PbTe (111) single heterojunctions

Jin

Cai

et al. 2013

Phys. Rev. B

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The lattice-structure-mismatched CdTe/PbTe heterostructures are emerging materials with unique properties and promising applications in midinfrared optoelectronics and spintronics. High-density two-dimensional electron gas at the metastable twisted interfaces of CdTe/PbTe (111) is investigated experimentally and theoretically. CdTe thin films grown on PbTe(111) using molecular-beam epitaxy are found to have high electron mobilities and carrier concentrations from Hall-effect measurements: 2.02 × 10 4 cm 2 /V s and 4.5 × 10 18 cm −3 at 2 K, and 6.70 × 10 3 cm 2 /V s and 6.0 × 10 19 cm −3 at 77 K. Our density-functional theory modeling reveals that the epitaxially grown CdTe/PbTe (111) heterostructures form metastable twisted interfaces that exhibit unusual structural and electronic properties: (1) The PbTe epilayer on CdTe(111) substrates is structurally highly distorted from the rocksalt structure within the first ∼4.5 nm from the interface, which is caused by the stereochemical activity of the Pb s 2 lone pair. (2) The CdTe eplilayer on the PbTe(111) forms spontaneously a high density two-dimensional electron gas (2DEG) over 10 13 cm −2 near the interface, without the need for doping, which explains the experimentally observed high carrier density and mobility. It is a much simpler heterostructure yet able to offer high electron mobility comparable to and one or two order magnitude higher sheet carrier density than the best achieved values for those of Si and II-VI based quantum well structures relying on modulation doping.

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Section: B Density Of States At the Twisted Interfacementioning

confidence: 99%