Intersubband Emitters: GaAs-based Quantum-Cascade Lasers

Dr. Lutz Geelhaar

Acting Director

Head of Department Epitaxy

Lutz Geelhaar

phone: +49 30 20377 359

room: 0714

email: geelhaar@pdi-berlin.de

 

Department: Epitaxy

Core research areas: Nanofabrication , III-V nanowires for optoelectronics

 

 

31 Author Ali Al-Hassan , A. Davtyan , H. Küpers , R. B. Lewis , D. Bahrami , F. Bertram , Genziana Bussone , C. Richter , L. Geelhaar , U. Pietsch
Title

Complete structural and strain analysis of single GaAs/(In,Ga)As/GaAs core-shell-shell nanowires by means of in-plane and out-of-plane x-ray nano-diffraction

Source J. Appl. Cryst. , 51 , 1387 ( 2018 )
DOI : 10.1107/S1600576718011287 | 3066 Cite : Bibtex RIS
Ali Al-Hassan, A. Davtyan, H. Küpers, R. B. Lewis, D. Bahrami, F. Bertram, Genziana Bussone, C. Richter, L. Geelhaar, and U. Pietsch

32 Author L. Hüttenhofer , R. B. Lewis , S. Rauwerdink , A. Tahraoui , H. Küpers , L. Geelhaar , O. Marquardt , S. Ludwig
Title

Optimization of ohmic contacts to n-type GaAs nanowires

Source Phys. Rev. Appl. , 10 , 034024 ( 2018 )
DOI : 10.1103/PhysRevApplied.10.034024 | Download arXiv: 1711.08284 | 2988 Cite : Bibtex RIS
L. Hüttenhofer, R. B. Lewis, S. Rauwerdink, A. Tahraoui, H. Küpers, L. Geelhaar, O. Marquardt, and S. Ludwig

33 Author A. Senichev , P. Corfdir , O. Brandt , M. Ramsteiner , S. Breuer , J. Schilling , L. Geelhaar , P. Werner
Title

Electronic properties of wurtzite GaAs: A correlated structural, optical, and theoretical analysis of the same polytypic GaAs nanowire

Source Nano Res. , 11 , 4708 ( 2018 )
DOI : 10.1007/s12274-018-2053-5 | 3036 Cite : Bibtex RIS
A. Senichev, P. Corfdir, O. Brandt, M. Ramsteiner, S. Breuer, J. Schilling, L. Geelhaar, and P. Werner

34 Author E. Courtade , B. Han , S.Nakhaie , C. Robert , X. Marie , P. Renucci , T. Taniguchi , K. Watanabe , L. Geelhaar , J. M. J. Lopes , B. Urbaszek
Title

Spectrally narrow exciton luminescence from monolayer MoS2 and MoSe2 exfoliated onto epitaxially grown hexagonal BN

Source Appl. Phys. Lett. , 113 , 032106 ( 2018 )
DOI : 10.1063/1.5033554 | Download: PDF | 3051 Cite : Bibtex RIS
E. Courtade, B. Han, S.Nakhaie, C. Robert, X. Marie, P. Renucci, T. Taniguchi, K. Watanabe, L. Geelhaar, J. M. J. Lopes, and B. Urbaszek

35 Author A. Davtyan , V. Favre-Nicolin , R. B. Lewis , H. Küpers , L. Geelhaar , D. Kriegner , D. Bahrami , A. Al-Hassan , G. Chahine , O. Loffeld , U. Pietsch
Title

Coherent X-ray diffraction imaging meets ptychography to study core-shell-shell nanowires

Source MRS Advances , 3 , 2317 ( 2018 )
DOI : 10.1557/adv.2018.466 | 3038 Cite : Bibtex RIS
A. Davtyan, V. Favre-Nicolin, R. B. Lewis, H. Küpers, L. Geelhaar, D. Kriegner, D. Bahrami, A. Al-Hassan, G. Chahine, O. Loffeld, and U. Pietsch

36 Author P. Corfdir , G. Calabrese , A. Laha , T. Auzelle , L. Geelhaar , O. Brandt , S. Fernández-Garrido
Title

Monitoring the formation of GaN nanowires in molecular beam epitaxy by polarization-resolved optical reflectometry

Source CrystEngComm , 20 , 3202 ( 2018 )
DOI : 10.1039/C8CE00431E | 3006 Cite : Bibtex RIS
P. Corfdir, G. Calabrese, A. Laha, T. Auzelle, L. Geelhaar, O. Brandt, and S. Fernández-Garrido

37 Author R. B. Lewis , P. Corfdir , H. Küpers , T. Flissikowski , O. Brandt , L. Geelhaar
Title

Nanowires bending over backward from strain partitioning in asymmetric core-shell heterostructures

Source Nano Lett. , 18 , 2343 ( 2018 )
DOI : 10.1021/acs.nanolett.7b05221 | 2989 Cite : Bibtex RIS
R. B. Lewis, P. Corfdir, H. Küpers, T. Flissikowski, O. Brandt, and L. Geelhaar

38 Author S. Fernández-Garrido , M. Ramsteiner , L. A. Galves , C. Sinito , J. M. J. Lopes , L. Geelhaar , O. Brandt
Title

Plasma-assisted molecular beam epitaxy of GaN nanowires on epitaxial single-layer graphene

Source Proc. SPIE , 10532 , 105321U ( 2018 )
DOI : 10.1117/12.2288233 | Download: PDF | 3012 Cite : Bibtex RIS
S. Fernández-Garrido, M. Ramsteiner, L. A. Galves, C. Sinito, J. M. J. Lopes, L. Geelhaar, and O. Brandt

39 Author H. Küpers , R. B. Lewis , A. Tahraoui , M. Matalla , O. Krüger , F. Bastiman , H. Riechert , L. Geelhaar
Title

The diameter evolution of selective area grown Ga-assisted GaAs nanowires in molecular beam epitaxy

Source Nano Res. , 11 , 2885 ( 2018 )
DOI : 10.1007/s12274-018-1984-1 | 2956 Cite : Bibtex RIS
H. Küpers, R. B. Lewis, A. Tahraoui, M. Matalla, O. Krüger, F. Bastiman, H. Riechert, and L. Geelhaar

40 Author A. Al Hassan , R. B. Lewis , H. Küpers , W. H. Lin , D. Bahrami , T. Krause , D. Salomon , A. Tahraoui , M. Hanke , L. Geelhaar , U. Pietsch
Title

Nano x-ray fluorescence of individual GaAs/InGaAs core-shell nanowires

Source Phys. Rev. Mater. , 2 , 014604 ( 2018 )
DOI : 10.1103/PhysRevMaterials.2.014604 | 3040 Cite : Bibtex RIS
A. Al Hassan, R. B. Lewis, H. Küpers, W. H. Lin, D. Bahrami, T. Krause, D. Salomon, A. Tahraoui, M. Hanke, L. Geelhaar, and U. Pietsch

Contact

Prof. Dr. Holger T. Grahn

Head of Department 

+49 30 20377-318

htgrahn@pdi-berlin.de

Dr. Lutz Schrottke

Senior Scientist

+49 30 20377-339

lutz@pdi-berlin.de