Forschungsbericht

Third-party-funded project

Title:
Growth and characterization of narrow gap heterostructues

Project management at the University of Würzburg:

Dr. Charles R. Becker ,Tel: (0)931 888-5794,Fax: (0)931 888-5142,Mail: becker@physik.uni-wuerzburg.de
Prof. Dr. Laurens W. Molenkamp ,Tel: (0)931 888-4925,Fax: (0)931 888-5142,Mail: molenkamp@physik.uni-wuerzburg.de

Participating scientists:

Dr. Kai Ortner ,Tel: (0)531 2155-637,Fax: (0)531 2155-900,Mail: ortner@ist.fhg.de
Dipl.-Physiker Volker Daumer ,Tel: (0)931 888-5794,Fax: (0)931 888-5142,Mail: daumer@physik.uni-wuerburg.de
Dipl.-Physiker Matthias Schäfer ,Tel: (0)931 888-5869,Fax: (0)931 888-5142,Mail: schaefer@physik.uni-wuerzburg.de

Abstract:
The main goal is to provide numerous projects with narrow gap
semiconductors and heterostructures as well as manganese based
heterostructures. By changing the 2D electron concentration,
e.g., Rashba spin-orbit splitting and the influence of managese
has been investigated. In order to accomplish this, Schottky Gates
were developed and improved.
Also of importance is the improvement of substitional n and p type
doping of epitaxially grown layers as well as n and p type modulation
doping of HgTe/HgCdTe heterostructures and manganese containing
HgTe/HgCdTe heterostructures.

Key words:
    Quantum well
    Modulation doping
    Manganese
    Molecular beam epitaxy

Projekt period: from 01.1995 to 12.2003

Funding institution:
DFG ( SFB 410, dritte Förderperiode )

Preceding project:
SFB 410, zweite Förderperiode

Publications:

M. Betz, G. Göger, A. Laubereau, P. Gartner, L. Banyai, H. Haug, K. Ortner, C. R. Becker, A. Leitenstorfer. (2001). Subthreshold Carrier-LO Phonon Dynamics in Semiconductors with Intermediate Polaron Coupling: A Purely Quantum Kinetic Relaxation Channel. Phys. Rev. Lett., Vol. 86, p. 4684-4687. (scientific article)
X. C. Zhang, A. Pfeuffer-Jeschke, K. Ortner, V. Hock, H. Buhmann, C. R. Becker and G. Landwehr. (2001). Rashba splitting in n-type modulation doped HgTe quantum wells with an inverted band structure. Phys. Rev. B {\bf 63}, 245305-1 245305-8, Vol.63, p.245305-1 245305-8. (scientific article)
I. Stolpe, O. Portugall, N. Puhlmann, H.-U. Müller, M. von Ortenberg, M. von Truchsess, C. R. Becker, A. Pfeiffer-Jeschke and G. Landwehr. (2001). Intra- and Inter-band transitions in HgSe in megagauss fields. Physica B, Vol.294-295, p.459-462. (scientific article)
C. R. Becker, X. C. Zhang, K. Ortner, J. Schmidt, A. Pfeuffer-Jeschke, V. Latussek and G. Landwehr. (2001). Growth and Physics of HgCdTe and Type III HgTe/HgCdTe Heterostructures. The Institute of Pure and Applied Physics Conf. Series 2, Tokyo, Japan, p. 61. (scientific article)
C. R. Becker, X. C. Zhang, K. Ortner, A. Pfeuffer-Jeschke, V. Hock and G. Landwehr. (2001). Rashba Spin-Orbit Splitting in Type III HgTe/HgCdTe Quantum Wells. The Institute of Pure and Applied Physics Conf. Series 2, Tokyo, Japan, p. 239. (scientific article)
W. Szuszkiewicz, E. Dynowska, J. Bak-Misiuk, M. Jouanne, J. F. Morhange, S. Oehling and C. R. Becker. (2001). MBE-Grown HgMgTe Layers: Characterizationby X-Ray Diffraction. The Institute of Pure and Applied Physics Conf. Series 2, Tokyo, Japan, p. 65. (scientific article)
K. Ortner, X. C. Zhang, S. Oehling, J. Gerschütz, A. Pfeuffer-Jeschke, V. Hock. C. R. Becker, G. Landwehr and L. W. Molenkamp. (2001). Growth and characterization of p-type HgTe/HgCdTe single quantum wells using nitrogen and arsenic. Appl. Phys. Lett., Vol. 79, p. 3980. (scientific article)
C. R. Becker, Y. S. Gui, J. Liu, V. Daumer, K. Ortner, V. Hock, A. Pfeuffer-Jeschke, H. Buhmann and L. W. Molenkamp. (2001). Growth and magneto-transport of gate controlled n type HgTe/HgCdTe quantum wells with the inclusion of Mn. phys. stat. sol. (b), Vol. 229, p. 775-779. (scientific article)
T. Feurer, A. Morak, I. Uschmann, Ch. Ziener, Ch. Reich, P. Gibbon, E. Föster, R. Sauerbrey, K. Ortner and C. R. Becker. (2001). Subpicosecond silicon K(alpha) pulses from laser produced plasmas. Phys. Rev. E, Vol. 65, p. 016412. (scientific article)
Y. S. Gui, J. Liu, K. Ortner, V. Daumer, C. R. Becker, H. Buhmann, L. W. Molenkamp. (2001). Antiferromagnetic temperature and effective spin in n type HgMnTe. Appl. Phys. Lett., Vol. 79, p. 1321. (scientific article)
C. R. Becker, X. C. Zhang, K. Ortner, A. Pfeuffer-Jeschke, V. Latussek, Y. S. Gui, V. Daumer , J. Liu, H. Buhmann, G. Landwehr and L. W. Molenkamp. (2002). MBE growth and characterization of Hg based compoundsand heterostructures. Thin Solid Films, Vol. 412, p. 129-138. (scientific article)
X. C. Zhang, K. Ortner, A. Pfeuffer-Jeschke, C. R. Becker and G. Landwehr. (2002). Absence of magneto-intersubband scattering in n-type HgTe/HgCdTe quantum wells. Phys. Rev. B, Vol. 65, p. 045324. (scientific article)
K. Ortner, X. C. Zhang, A. Pfeuffer-Jeschke, C. R. Becker, G. Landwehr and L. W. Molenkamp. (2002). Valence band structure of HgTe/HgCdTe single quantum wells. Phys. Rev. B, Vol. 66, p. 075322-1. (scientific article)
C.R. Becker, X. C. Zhang, A. Pfeuffer-Jeschke, K. Ortner, V. Hoch, G. Landwehr, L.W.Molenkamp. (2002). Very large Rashba spin-orbit splitting in HgTe quantum wells. J. Supercond., in press. (scientific article)
C.R. Becker, X. C. Zhang, K. Ortner, A. Pfeuffer-Jeschke, V. Latussek, V. Daumer, G. Landwehr and L. W. Molenkamp. (2002). MBE growth and characterization of HgTe based quantum wells and superlattices. J. Alloys and Compounds, in press. (scientific article)
Y. S. Gui, C. R. Becker, J. Liu, V. Daumer, H. Buhmann, L. W. Molenkamp. (2002). Interplay of Rashba, Zeeman, and Landau splitting in a magnetic two dimensional electron gas. cond-mat, 026355. (scientific article)

Links:
Home page of A2 (Charlie Becker)