It has been demonstrated that the hydrostatic deformation potential of a semimetal can be determined from the pressure dependence of intersubband transitions in superlattices containing the semimetal. By means of an investigation of optical absorption in HgTe / Hg0.3Cd0.7Te superlattices at hydrostatic pressures up to 3 GPa at room temperature the following values have been determined: C−a= −3.69 ± 0.10 eV and a HgTe−aCdTe= 1.31 ± 0.10 eV, where C and a are the deformation potentials of the conduction and valence bands, respectively. Bulk HgTe normally undergoes a phase transition to the cinnabar structure at <1.3 GPa. How- ever, this phase transition is frustrated in HgTe / Hg0.3Cd0.7Te superlattices and the HgTe layers are super- pressed above 1.3 GPa.
Deformation potentials of the semimetal HgTe / V.Latussek; C.R.Becker; G.Landwehr; R Bini; L.Ulivi. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 71:(2005), pp. 125305-1-125305-7. [10.1103/PhysRevB.71.125305]
Deformation potentials of the semimetal HgTe
BINI, ROBERTO;
2005
Abstract
It has been demonstrated that the hydrostatic deformation potential of a semimetal can be determined from the pressure dependence of intersubband transitions in superlattices containing the semimetal. By means of an investigation of optical absorption in HgTe / Hg0.3Cd0.7Te superlattices at hydrostatic pressures up to 3 GPa at room temperature the following values have been determined: C−a= −3.69 ± 0.10 eV and a HgTe−aCdTe= 1.31 ± 0.10 eV, where C and a are the deformation potentials of the conduction and valence bands, respectively. Bulk HgTe normally undergoes a phase transition to the cinnabar structure at <1.3 GPa. How- ever, this phase transition is frustrated in HgTe / Hg0.3Cd0.7Te superlattices and the HgTe layers are super- pressed above 1.3 GPa.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.