Publikationen 1992 - 1982

Hot lines at mK temperatures: ³He/⁴He calorimetric absorption spectra of the Fe³⁺-- Fe²⁺ charge transfer transitions in GaP
L. Podlowski, T. Wolf, R. Heitz, A. Hoffmann, W. Ulrici, D. Bimberg, and I. Broser
21st Int. Conf. on the Phys. of Semicond. copyright by World Scientific Publishing, eds. P. Jiang and H.-J. Zheng, (1992), 1665
paper

Dynamical behavior of excitons in ZnSe/GaAs-heterostructures
G. Kudlek, Ch. Fricke, N. Presser, R. Heitz, A. Hoffmann, J. Gutowski, and I. Broser
21st Int. Conf. on the Phys. of Semicond. copyright by World Scientific Publishing, eds. P. Jiang and
H.-J. Zheng, (1992), 1168
paper

Calorimetric absorption spectra of deep donors in silicon at mK temperatures
A. Hoffmann, L. Podlowski, R. Heitz, I. Broser, and H. G. Grimmeis
21st Int. Conf. on the Phys. of Semicond. copyright by World Scientific Publishing, eds. P. Jiang and H.-J. Zheng, (1992), 1645
paper

Gain and loss mechanisms in InGaAs/InGaAsP-MQW-laser structures
A. Hoffmann, M. Tischel, R. Heitz, L. Podlowski, M. Rosenzweig, and M. Möhrle
Superlattices and Microstructures 12 (1992), 561
paper

Recombination kinetics of CdS: In
Ch. Fricke, U. Neukirch, R. Heitz, A. Hoffmann, and I. Broser
J. Cryst. Growth 117 (1992), 783
paper

Fast relaxation phenomena in Ni-doped II-VI compounds
A. Hoffmann, B. Lummer, Ch. Fricke, R. Heitz, and I. Broser
J. Cryst. Growth 117 (1992), 640
paper

Calorimetric absorption spectroscopy at mK temperatures - an extremely sensitive method to determine nonradiative processes in solids -
L. Podlowski, A. Hoffmann, and I. Broser
J. Cryst. Growth 117 (1992), 698
paper

Nonlinear Zeeman effect of the Ni³⁺-center in ZnO
P. Thurian, R. Heitz, A. Hoffmann, and I. Broser
J. Cryst. Growth 117 (1992), 727
paper

Optical nonlinearity and fast switching due to birefringence and mode coupling in CdS crystals
I. Broser, Ch. Fricke, B. Lummer, R. Heitz, and A. Hoffmann
J. Cryst. Growth 117 (1992), 788
paper

Nonradiative recombination processes of Ni-impurities in CdS and ZnS
L. Podlowski, R. Heitz, A. Hoffmann, and I. Broser
J. Lum. 53 (1992), 401
paper

Picosecond recombination dynamics at Ni-centers in ZnS and CdS
R. Heitz, A. Hoffmann, and I. Broser
J. Lum. 53 (1992), 359
paper

Picosecond relaxation of Ni-centers in II-VI semiconductors
R. Heitz, A. Hoffmann, and I. Broser
Optical Materials 1 (1992), 75
paper

Cathodo-luminescence wavelength imaging for spatial mapping of excitons bound to dislocations and structural defects in CdS
A. Hoffmann, J. Christen, and J. Gutowski
Advanced Materials for Optics and Electronics 1 (1992), 25
paper

Fe³⁺-center in ZnO
R. Heitz, A. Hoffmann, and I. Broser
Phys. Rev. B 45 (1992), 8977
paper

The copper center-a transient shallow acceptor in ZnS and CdS
R. Heitz, A. Hoffmann, P. Thurian, and I. Broser
J. Phys.: Condens. Matter 4 (1992), 157

Luminescence of a 5d center in ZnS
R. Heitz, P. Thurian, A. Hoffmann, and I. Broser
Materials Science Forum 83-87 (1992), 1247
paper

Picosecond energy transfer between excitons and defects in II-VI semiconductors
R. Heitz, C. Fricke, A. Hoffmann, and I. Broser
Materials Science Forum 83-87 (1992), 1241
paper

Non-linear optical gain of InGaAs/InGaAs - quantum wells
M. Rosenzweig, M. Möhrle, H. Düser, M. Tischel, R. Heitz, and A. Hoffmann
SPIE (Aachen) Vol. 1362 Phys. Conc. of Materials for Optoelectronic Device Applications II: Device Physics and Application (1991), 876

Threshold current and carrier lifetime in MOVPE regrown 1.5 µm GaInAsP- buried ridge structure lasers
M. Tischel, M. Rosenzweig, A. Hoffmann, H. Venghaus, and F. Fidorra
SPIE (Aachen) Vol. 1361 Phys. Conc. of Materials for Optoelectronic Device Applications II: Device Physics and Application (1991), 917
paper

Term  structure of bound excitons in cubic ZnSe: Na
G. Kudlek, A. Hoffmann, R. Heitz, C. Fricke, J. Gutowski, G. F. Neumark, and R. N. Bhargava
J. Lumin. 48/49 (1991), 138
paper

Zeeman spectroscopy of the V³⁺ luminescence in ZnO
R. Heitz, A. Hoffmann, B. Hausmann, and I. Broser
J. Lumin. 48/49 (1991), 689
paper

Zeeman-and piezo-spectroscopy of the Cu²⁺- center in CdS
I. Broser, A. Hoffmann, R. Heitz, and P. Thurian
J. Lumin. 48/49 (1991), 693
paper

Magneto-optics and excitation spectroscopy of Na acceptor-bound excitons in ZnSe
A. Hoffmann, G. Kudlek, R. Heitz, N. Presser, J. Gutowski, G. F. Neumark, and R. N. Bhargava
Bulletin of the American Physical Society 35 (1990), 528
paper

Fine structure of the Cu²⁺center in CdS
A. Hoffmann, I. Broser, P. Thurian, and R. Heitz
J. Cryst. Growth 101 (1990), 532
paper

Jahn-Teller effect and zero- phonon line shifts of transition metals in II-VI compounds
A. Hoffmann and U. Scherz
J. Cryst. Growth 101 (1990), 385
paper

Fe³⁺ as near-infrared luminescence center in ZnS
A. Hoffmann, R. Heitz, and I. Broser
Phys. Rev. B 41 (1990), 5806
paper

 
Magneto-optics of excitons bound to dislocations in CdS
J. Gutowski and A. Hoffmann
Materials Science Forum 38-41 (1989), 1391
paper

Time resolved spectroscopy of deeply Cu-bound excitons in ZnS
A. Hoffmann, A. Franz, A. Ismail, F. Asch, and I. Broser
Materials Science Forum 38-41 (1989), 525
paper

Raman studies of hexagonal ZnS: Al
A. Krol, A. Hoffmann, and J. Gutowski
Phys. Rev. B 38 (1988), 10946
paper

Magneto-optics and excitation spectroscopy: Two efficient methods for distinguishing excitons bound to different acceptor centers in CdS
J. Gutowski and A. Hoffmann
Phys. Rev. B 37 (1988), 4076
paper

Isotope shifts of emission and absorption lines at CdS: Ni²⁺: Interpretation by a dynamic Jahn-Teller effect
U. Scherz, A. Hoffmann, B. Nestler, and L. B. Xu
J. Lumin. 40/41 (1988), 411
paper

Zero-phonon lines of the M-center in ZnS crystals
A. Hoffmann, I. Broser, and P. Thomsen-Schmidt
J. Lumin. 40/41 (1988), 321
paper

Identification of the Fe³⁺ center in ZnS
A. Hoffmann, R. Heitz, and I. Broser
Proc. of 6th Lund Int. Conf. on Deep Level Impurities in Semiconductors, Cagliari/Italy (1987), A 27
paper

A sum rule for deep centers in II-VI compounds
I. Broser, A. Hoffmann, and R. Broser
Proc. of 6th Lund Int. Conf. on Deep Level Impurities in Semiconductors, Cagliari/Italy (1987), A 8
paper

Investigation of the Jahn-Teller effect through the isotope shift and Zeeman splitting of optical transitions of CdS: Ni²⁺
B. Nestler, A. Hoffmann, L. B. Xu, U. Scherz, and I. Broser
J. Phys. C: Solid State Phys. 20 (1987), 4613
paper

Bound-exciton-related fine structure in charge transfer spectra of InP: Fe detected by calorimetric absorption spectroscopy
A. Juhl, H.-J. Schulz, A. Hoffmann, and D. Bimberg
Appl. Phys. Lett. 50 (1987), 1292
paper

High-resolution optical spectroscopy of nickel ions in II-VI semiconductors: Isotope shifts at the ³T₁(F) - ³T₁(P) and ³T₁(F)
- ³A₂(F) transitions in CdS and ZnS crystals
I. Broser, A. Hoffmann, R. Germer, R. Broser, and E. Birkicht
Phys. Rev. B 33 (1986), 8196
paper

1985

Fine structure spectroscopy of Ni-ions in II-VI semiconductors: A novel method to investigate the electron-phonon interaction in doped semiconductors
A. Hoffmann
Thesis, TU Berlin, (1985)

High resolution spectroscopy of Ni ²⁺- and M-center in polytypic ZnS
I. Broser, R. Broser, E. Birkicht, and A. Hoffmann
J. Lumin. 31/32 (1984), 424
paper

Excitation spectroscopy of the deep impurity center Ni²⁺ in CdS
I. Broser, A. Hoffmann, and R. Broser
4th International Conf. on Deep Level Impurity in Semiconductors, Eger,Ungarn (1983), Proceedings p. 150
paper

Electronic and vibronic states of the acceptor-bound-exciton complex (A0, X) in CdS
R. Baumert, I. Broser, J. Gutowski, and A. Hoffmann
Phys. Rev. B 27 (1983), 6263
paper

Forbidden luminescence and resonance Raman scattering of bound excitons in CdS
R. Baumert, I. Broser, J. Gutowski, and A. Hoffmann
phys. stat. sol. (b) 116 (1983), 261
paper

CdSe in Landolt-Börnstein, Band 17, Halbleiter
I.Broser, R. Broser, A. Hoffmann
Hrsg. O. Madelung, (1982)
paper