Head of Department Semiconductor Spectroscopy
phone: +49 30 20377 318
phone mobile: 602
room: 0517
email: htgrahn@pdi-berlin.de
Department: Semiconductor Spectroscopy
Core research areas: Ferromagnet/ semiconductor hybrid structures , Intersubband emitters , III-V nanowires for optoelectronics
1 | Author | O. Brandt , V. M. Kaganer , J. Lähnemann , T. Flissikowski , C. Pfüller , K. K. Sabelfeld , A. E. Kireeva , C. Chèze , R. Calarco , H. T. Grahn , U. Jahn |
Title |
Carrier diffusion in GaN: A cathodoluminescence study. II: Ambipolar vs. exciton diffusion |
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Source | Phys. Rev. Appl. , 17 , 024018 ( 2022 ) | |
DOI : 10.1103/PhysRevApplied.17.024018 | Download arXiv: 2009.13983 | Cite : Bibtex RIS |
2 | Author | Hanno Küpers , Ryan B. Lewis , Pierre Corfdir , Michael Niehle , T. Flissikowski , H. T. Grahn , A. Trampert , O. Brandt , L. Geelhaar |
Title |
Drastic effect of sequential deposition resulting from flux directionality for the luminescence efficiency of nanowire shells |
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Source | ACS Appl. Mater. Interfaces , 13 , 50220 ( 2021 ) | |
DOI : 10.1021/acsami.1c12371 | Download arXiv: 2106.12309 | Cite : Bibtex RIS |
3 | Author | D. Jayasankar , V. Drakinskiy , N. Rothbart , H. Richter , X. Lü , L. Schrottke , H. T. Grahn , M. Wienold , H.-W. Hübers , P. Sobis , J. Stake |
Title |
A 3.5-THz, ×6-Harmonic, Single-Ended Schottky Diode Mixer for Frequency Stabilization of Quantum-Cascade Lasers |
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Source | IEEE Trans. Terahertz Sci. Technol. , 11 , 684 ( 2021 ) | |
DOI : 10.1109/TTHZ.2021.3115730 | Cite : Bibtex RIS |
4 | Author | T. Auzelle , M. Azadmand , T. Flissikowski , M. Ramsteiner , K. Morgenroth , C. Stemmler , S. Fernández-Garrido , S. Sanguinetti , H. T. Grahn , L. Geelhaar , O. Brandt |
Title |
Enhanced radiative efficiency in GaN nanowires grown on sputtered TiNx |
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Source | ACS Photonics , 8 , 1718 ( 2021 ) | |
DOI : 10.1021/acsphotonics.1c00224 | Download arXiv: 2001.06387 | Cite : Bibtex RIS |
5 | Author | X. Lü , B. Röben , L. Schrottke , K. Biermann , H. T. Grahn |
Title |
Correlation between frequency and location on the wafer for terahertz quantum-cascade lasers |
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Source | Semicond. Sci. Technol. , 36 , 035012 ( 2021 ) | |
DOI : 10.1088/1361-6641/abdd4b | Cite : Bibtex RIS |
6 | Author | K. Biermann , Paul L. J. Helgers , A. Crespo-Poveda , A. S. Kuznetsov , A. Tahraoui , B. Röben , X. Lü , L. Schrottke , P. V. Santos , H. T. Grahn |
Title |
In-situ control of molecular beam epitaxial growth by spectral reflectivity analysis |
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Source | J. Cryst. Growth , 557 , 125993 ( 2021 ) | |
DOI : 10.1016/j.jcrysgro.2020.125993 | Cite : Bibtex RIS |
7 | Author | D. Czubak , S. Gaucher , L. Oppermann , J. Herfort , K. Zollner , J. Fabian , H. T. Grahn , M. Ramsteiner |
Title |
Electronic and magnetic properties of alpha-FeGe2 films embedded in vertical spin valve devices |
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Source | Phys. Rev. Mater. , 4 , 104415 ( 2020 ) | |
DOI : 10.1103/PhysRevMaterials.4.104415 | Download arXiv: 2010.04453 | Cite : Bibtex RIS |
8 | Author | B. Röben , X. Lü , K. Biermann , L. Schrottke , H. T. Grahn |
Title |
Effective group dispersion of terahertz quantum-cascade lasers |
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Source | J. Phys. D: Appl. Phys. , 54 , 025110 ( 2020 ) | |
DOI : 10.1088/1361-6463/abbde3 | Cite : Bibtex RIS |
9 | Author | H.-W. Hübers , H. Richter , M. Wienold , X. Lü , L. Schrottke , H. T. Grahn |
Title |
Terahertz spectroscopy using quantum-cascade lasers |
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Source | Photoniques , 101 , 27 ( 2020 ) | |
DOI : 10.1051/photon/202010127 | Cite : Bibtex RIS |
10 | Author | L. Schrottke , X. Lü , B. Röben , K. Biermann , T. Hagelschuer , M. Wienold , H.-W. Hübers , M. Hannemann , J.-P. H. van Helden , J. Röpcke , H. T. Grahn |
Title |
High-performance GaAs/AlAs terahertz quantum-cascade lasers for spectroscopic applications |
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Source | IEEE Trans. Terahertz Sci. Technol. , 10 , 133 ( 2019 ) | |
DOI : 10.1109/TTHZ.2019.2957456 | Cite : Bibtex RIS |