Quantum transport in n-type and p-type modulation-doped mercury telluride quantum wells

✍ Scribed by G. Landwehr; J. Gerschütz; S. Oehling; A. Pfeuffer-Jeschke; V. Latussek; C.R. Becker

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 200 KB
• Volume: 6
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(99)00179-4

✦ Synopsis

Asymmetrically modulation-doped HgTe quantum wells of (0 0 1) orientation were produced by molecular beam epitaxy. N-type doping was achieved with iodine and p-type doping by the incorporation of nitrogen. At 4.2 K the n-type samples have electron mobilities up to 10 5 cm 2 =Vs, the maximum Hall mobility of the p-type specimens is around 2 × 10 4 cm 2 =Vs. Very pronounced Shubnikov-de Haas oscillations were observed in both n-type and p-type samples. In the n-type specimens the quantum oscillations persisted up to temperatures of 60 K. The Shubnikov-de Haas oscillations in the p-type samples were highly irregular. Because the data cannot be explained without detailed theoretical calculations of Landau levels for the heterostructure self consistent Hartree calculations were performed using a 8 × 8k • p model. The magnetic ÿeld-dependent density of states was calculated. More regular oscillations are predicted at higher magnetic ÿelds approaching 30 T.