Prof. Dr. Holger T. Grahn

Carrier diffusion in GaN: A cathodoluminescence study. II: Ambipolar vs. exciton diffusion

@article{ author = { O. Brandt and V. M. Kaganer and J. Lähnemann and T. Flissikowski and C. Pfüller and K. K. Sabelfeld and A. E. Kireeva and C. Chèze and R. Calarco and H. T. Grahn and U. Jahn }, title = { Carrier diffusion in GaN: A cathodoluminescence study. II: Ambipolar vs. exciton diffusion }, journal = { Physical Review Applied }, volume = { 17 }, year = { 2022 }, pages = { 024018 } }

TY - JOUR AU - O. Brandt AU - V. M. Kaganer AU - J. Lähnemann AU - T. Flissikowski AU - C. Pfüller AU - K. K. Sabelfeld AU - A. E. Kireeva AU - C. Chèze AU - R. Calarco AU - H. T. Grahn AU - U. Jahn TI - Carrier diffusion in GaN: A cathodoluminescence study. II: Ambipolar vs. exciton diffusion JF - Physical Review Applied JA - Phys. Rev. Appl. J1 - VL - 17 SP - 024018 PY - 2022/02/07

Drastic effect of sequential deposition resulting from flux directionality for the luminescence efficiency of nanowire shells

@article{ author = { Hanno Küpers and Ryan B. Lewis and Pierre Corfdir and Michael Niehle and T. Flissikowski and H. T. Grahn and A. Trampert and O. Brandt and L. Geelhaar }, title = { Drastic effect of sequential deposition resulting from flux directionality for the luminescence efficiency of nanowire shells }, journal = { ACS Applied Materials and Interfaces }, volume = { 13 }, year = { 2021 }, pages = { 50220 } }

TY - JOUR AU - Hanno Küpers AU - Ryan B. Lewis AU - Pierre Corfdir AU - Michael Niehle AU - T. Flissikowski AU - H. T. Grahn AU - A. Trampert AU - O. Brandt AU - L. Geelhaar TI - Drastic effect of sequential deposition resulting from flux directionality for the luminescence efficiency of nanowire shells JF - ACS Applied Materials and Interfaces JA - ACS Appl. Mater. Interfaces J1 - VL - 13 SP - 50220 PY - 2021/10/13

A 3.5-THz, ×6-Harmonic, Single-Ended Schottky Diode Mixer for Frequency Stabilization of Quantum-Cascade Lasers

@article{ author = { D. Jayasankar and V. Drakinskiy and N. Rothbart and H. Richter and X. Lü and L. Schrottke and H. T. Grahn and M. Wienold and H.-W. Hübers and P. Sobis and J. Stake }, title = { A 3.5-THz, ×6-Harmonic, Single-Ended Schottky Diode Mixer for Frequency Stabilization of Quantum-Cascade Lasers }, journal = { IEEE Transactions on Terahertz Science and Technology }, volume = { 11 }, year = { 2021 }, pages = { 684 } }

TY - JOUR AU - D. Jayasankar AU - V. Drakinskiy AU - N. Rothbart AU - H. Richter AU - X. Lü AU - L. Schrottke AU - H. T. Grahn AU - M. Wienold AU - H.-W. Hübers AU - P. Sobis AU - J. Stake TI - A 3.5-THz, ×6-Harmonic, Single-Ended Schottky Diode Mixer for Frequency Stabilization of Quantum-Cascade Lasers JF - IEEE Transactions on Terahertz Science and Technology JA - IEEE Trans. Terahertz Sci. Technol. J1 - VL - 11 SP - 684 PY - 2021/09/27

Enhanced radiative efficiency in GaN nanowires grown on sputtered TiNx

@article{ author = { T. Auzelle and M. Azadmand and T. Flissikowski and M. Ramsteiner and K. Morgenroth and C. Stemmler and S. Fernández-Garrido and S. Sanguinetti and H. T. Grahn and L. Geelhaar and O. Brandt }, title = { Enhanced radiative efficiency in GaN nanowires grown on sputtered TiNx }, journal = { ACS Photonics }, volume = { 8 }, year = { 2021 }, pages = { 1718 } }

TY - JOUR AU - T. Auzelle AU - M. Azadmand AU - T. Flissikowski AU - M. Ramsteiner AU - K. Morgenroth AU - C. Stemmler AU - S. Fernández-Garrido AU - S. Sanguinetti AU - H. T. Grahn AU - L. Geelhaar AU - O. Brandt TI - Enhanced radiative efficiency in GaN nanowires grown on sputtered TiNx JF - ACS Photonics JA - ACS Photonics J1 - VL - 8 SP - 1718 PY - 2021/05/12

Correlation between frequency and location on the wafer for terahertz quantum-cascade lasers

@article{ author = { X. Lü and B. Röben and L. Schrottke and K. Biermann and H. T. Grahn }, title = { Correlation between frequency and location on the wafer for terahertz quantum-cascade lasers }, journal = { Semiconductor Science and Technology }, volume = { 36 }, year = { 2021 }, pages = { 035012 } }

TY - JOUR AU - X. Lü AU - B. Röben AU - L. Schrottke AU - K. Biermann AU - H. T. Grahn TI - Correlation between frequency and location on the wafer for terahertz quantum-cascade lasers JF - Semiconductor Science and Technology JA - Semicond. Sci. Technol. J1 - SST VL - 36 SP - 035012 PY - 2021/02/05

In-situ control of molecular beam epitaxial growth by spectral reflectivity analysis

@article{ author = { K. Biermann and Paul L. J. Helgers and A. Crespo-Poveda and A. S. Kuznetsov and A. Tahraoui and B. Röben and X. Lü and L. Schrottke and P. V. Santos and H. T. Grahn }, title = { In-situ control of molecular beam epitaxial growth by spectral reflectivity analysis }, journal = { Journal of Crystal Growth }, volume = { 557 }, year = { 2021 }, pages = { 125993 } }

TY - JOUR AU - K. Biermann AU - Paul L. J. Helgers AU - A. Crespo-Poveda AU - A. S. Kuznetsov AU - A. Tahraoui AU - B. Röben AU - X. Lü AU - L. Schrottke AU - P. V. Santos AU - H. T. Grahn TI - In-situ control of molecular beam epitaxial growth by spectral reflectivity analysis JF - Journal of Crystal Growth JA - J. Cryst. Growth J1 - JGC VL - 557 SP - 125993 PY - 2021/01/07

Electronic and magnetic properties of alpha-FeGe2 films embedded in vertical spin valve devices

@article{ author = { D. Czubak and S. Gaucher and L. Oppermann and J. Herfort and K. Zollner and J. Fabian and H. T. Grahn and M. Ramsteiner }, title = { Electronic and magnetic properties of alpha-FeGe2 films embedded in vertical spin valve devices }, journal = { Physical Review Materials }, volume = { 4 }, year = { 2020 }, pages = { 104415 } }

TY - JOUR AU - D. Czubak AU - S. Gaucher AU - L. Oppermann AU - J. Herfort AU - K. Zollner AU - J. Fabian AU - H. T. Grahn AU - M. Ramsteiner TI - Electronic and magnetic properties of alpha-FeGe2 films embedded in vertical spin valve devices JF - Physical Review Materials JA - Phys. Rev. Mater. J1 - VL - 4 SP - 104415 PY - 2020/10/26

Effective group dispersion of terahertz quantum-cascade lasers

@article{ author = { B. Röben and X. Lü and K. Biermann and L. Schrottke and H. T. Grahn }, title = { Effective group dispersion of terahertz quantum-cascade lasers }, journal = { Journal of Physics D: Applied Physics }, volume = { 54 }, year = { 2020 }, pages = { 025110 } }

TY - JOUR AU - B. Röben AU - X. Lü AU - K. Biermann AU - L. Schrottke AU - H. T. Grahn TI - Effective group dispersion of terahertz quantum-cascade lasers JF - Journal of Physics D: Applied Physics JA - J. Phys. D: Appl. Phys. J1 - JPD VL - 54 SP - 025110 PY - 2020/10/22

Terahertz spectroscopy using quantum-cascade lasers

@article{ author = { H.-W. Hübers and H. Richter and M. Wienold and X. Lü and L. Schrottke and H. T. Grahn }, title = { Terahertz spectroscopy using quantum-cascade lasers }, journal = { Photoniques }, volume = { 101 }, year = { 2020 }, pages = { 27 } }

TY - JOUR AU - H.-W. Hübers AU - H. Richter AU - M. Wienold AU - X. Lü AU - L. Schrottke AU - H. T. Grahn TI - Terahertz spectroscopy using quantum-cascade lasers JF - Photoniques JA - Photoniques J1 - VL - 101 SP - 27 PY - 2020/04/29

High-performance GaAs/AlAs terahertz quantum-cascade lasers for spectroscopic applications

@article{ author = { L. Schrottke and X. Lü and B. Röben and K. Biermann and T. Hagelschuer and M. Wienold and H.-W. Hübers and M. Hannemann and J.-P. H. van Helden and J. Röpcke and H. T. Grahn }, title = { High-performance GaAs/AlAs terahertz quantum-cascade lasers for spectroscopic applications }, journal = { IEEE Transactions on Terahertz Science and Technology }, volume = { 10 }, year = { 2019 }, pages = { 133 } }

TY - JOUR AU - L. Schrottke AU - X. Lü AU - B. Röben AU - K. Biermann AU - T. Hagelschuer AU - M. Wienold AU - H.-W. Hübers AU - M. Hannemann AU - J.-P. H. van Helden AU - J. Röpcke AU - H. T. Grahn TI - High-performance GaAs/AlAs terahertz quantum-cascade lasers for spectroscopic applications JF - IEEE Transactions on Terahertz Science and Technology JA - IEEE Trans. Terahertz Sci. Technol. J1 - VL - 10 SP - 133 PY - 2019/12/06