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Martin Knupfer

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TOP 3
Susi Lindner; Benjamin Mahns; Friedrich Roth; Rico Friedrich; Torsten Hahn; Martin Knupfer; Andreas König; Jens Kortus
Phthalocyanine dimers in a blend: spectroscopic and theoretical studies of MnPc(δ +)/F(16)CoPc(δ -).
Imad Ibrahim; Martin Knupfer; Sami Makharza; Alexey Popov; Alicja Bachmatiuk; Bernd Büchner; Gianaurelio Cuniberti; Daniel Grimm; Mark H Rümmeli
Understanding high-yield catalyst-free growth of horizontally aligned single-walled carbon nanotubes nucleated by activated C60 species.
Martha Scheffler; Ronny Schlegel; Danny Baumann; Mani Farjam; Alexander Grüneis; Danny Haberer; Torben Hänke; C Hess; Martin Knupfer; Luca Petaccia; Bernd Büchner
Probing local hydrogen impurities in quasi-free-standing graphene.

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All Publications

2013: Susi Lindner; Benjamin Mahns; Friedrich Roth; Rico Friedrich; Torsten Hahn; Martin Knupfer; Andreas König; Jens Kortus
Phthalocyanine dimers in a blend: spectroscopic and theoretical studies of MnPc(δ +)/F(16)CoPc(δ -).
The Journal of chemical physics 2013;138(2):024707.
2012: Imad Ibrahim; Martin Knupfer; Sami Makharza; Alexey Popov; Alicja Bachmatiuk; Bernd Büchner; Gianaurelio Cuniberti; Daniel Grimm; Mark H Rümmeli
Understanding high-yield catalyst-free growth of horizontally aligned single-walled carbon nanotubes nucleated by activated C60 species.
ACS nano 2012;6(12):10825-34.
2012: Martha Scheffler; Ronny Schlegel; Danny Baumann; Mani Farjam; Alexander Grüneis; Danny Haberer; Torben Hänke; C Hess; Martin Knupfer; Luca Petaccia; Bernd Büchner
Probing local hydrogen impurities in quasi-free-standing graphene.
ACS nano 2012;6(12):10590-7.
2012: Felix Börrnert; Bernd Büchner; Lei Fu; Sandeep Gorantla; Martin Knupfer; Mark H Rümmeli
Programmable sub-nanometer sculpting of graphene with electron beams.
ACS nano 2012;6(11):10327-34.
2012: Friedrich Roth; Ronny Schönfelder; Bernd Büchner; Silke Hampel; Benjamin Mahns; Markus Nohr; Martin Knupfer
Comprehensive studies of the electronic structure of pristine and potassium doped chrysene investigated by electron energy-loss spectroscopy.
The Journal of chemical physics 2012;137(11):114508.
2012: Marius Toader; Dietrich R T Zahn; Martin Knupfer; Pavel Shukrynau; Michael Hietschold
Site-dependent donation/backdonation charge transfer at the CoPc/Ag(111) interface.
Langmuir : the ACS journal of surfaces and colloids 2012;28(37):13325-30.
2012: T Kroll; O V Molodtsova; R Schönfelder; V Yu Aristov; P Hoffmann; R Kraus; Martin Knupfer
Transition metal phthalocyanines: insight into the electronic structure from soft x-ray spectroscopy.
The Journal of chemical physics 2012;137(5):054306.
2012: Susi Lindner; Rico Friedrich; Torsten Hahn; Martin Knupfer; Jens Kortus
Hybrid states and charge transfer at a phthalocyanine heterojunction: MnPc(δ+)/F16CoPc(δ-).
Physical review letters 2012;109(2):027601.
2012: Friedrich Roth; Roman Schuster; Martin Knupfer; Andreas König; Helmuth Berger
Momentum dependence of the excitons in pentacene.
The Journal of chemical physics 2012;136(20):204708.
2012: Benjamin Mahns; Friedrich Roth; Martin Knupfer
Absence of photoemission from the Fermi level in potassium intercalated picene and coronene films: structure, polaron, or correlation physics?
The Journal of chemical physics 2012;136(13):134503.
2012: Benjamin Mahns; Thomas Reichert; Friedrich Roth; Josef Salbeck; Tobat P I Saragi; Mandy Grobosch; Martin Knupfer; Susi Lindner; Torsten Hahn
Electronic properties of spiro compounds for organic electronics.
The Journal of chemical physics 2012;136(12):124702.
2012: R Friedrich; M Fronk; T Hahn; F Haidu; J Kortus; B Mahns; M Mehring; F Roth; G Salvan; M Schlesinger; D R T Zahn; Martin Knupfer
Electronic states and the influence of oxygen addition on the optical absorption behaviour of manganese phthalocyanine.
The Journal of chemical physics 2012;136(6):064704.
2012: J Trinckauf; VB Zabolotnyy; M V Zimmermann; M O Apostu; Sergey V Borisenko; Bernd Büchner; T Hänke; TK Kim; Martin Knupfer; K Koepernik; A Revcolevschi; T Ritschel; R Suryanarayanan; J Geck
Electronic confinement and ordering instabilities in colossal magnetoresistive bilayer manganites.
Physical review letters 2012;108(1):016403.
2011: Jasper van Wezel; Helmuth Berger; Martin Knupfer; Andreas König; Roman Schuster; Jeroen van den Brink; Bernd Büchner
Effect of charge order on the plasmon dispersion in transition-metal dichalcogenides.
Physical review letters 2011;107(17):176404.
2011: Danny Haberer; Stephan Irle; S Akbar Jafari; Martin Knupfer; Xianjie Liu; Hermann Sachdev; S Ravi P Silva; Uwe Treske; Dmitry Usachov; Oleg Vilkov; Denis V Vyalikh; Ying Wang; Vera K Adamchuk; Bernd Büchner; Mani Farjam; Alexander V Fedorov; Cristina E Giusca; Mandy Grobosch; Alexander Grüneis
Evidence for a new two-dimensional C4H-type polymer based on hydrogenated graphene.
Advanced materials (Deerfield Beach, Fla.) 2011;23(39):4497-503.
2011: Feng Zhu; Uwe Treske; Donghang Yan; Jianbing Yang; Weichao Chen; Mandy Grobosch; Lizhen Huang; Martin Knupfer
Hole transparent and hole blocking transport in single-crystal-like organic heterojunction: when rods hold up disks.
ACS applied materials & interfaces 2011;3(7):2195-9.
2011: Benjamin Mahns; Friedrich Roth; Mandy Grobosch; Dietrich R T Zahn; Martin Knupfer
Electronic excitations of potassium intercalated manganese phthalocyanine investigated by electron energy-loss spectroscopy.
The Journal of chemical physics 2011;134(19):194504.
2011: Marius Toader; Martin Knupfer; Dietrich R T Zahn; Michael Hietschold
Initial growth of lutetium(III) bis-phthalocyanine on Ag(111) surface.
Journal of the American Chemical Society 2011;133(14):5538-44.
2010: D Haberer; Denis V Vyalikh; S Taioli; B Dora; M Farjam; Jörg Fink; D Marchenko; Thomas Pichler; K Ziegler; S Simonucci; M S Dresselhaus; Martin Knupfer; Bernd Büchner; Alexander Grüneis
Tunable band gap in hydrogenated quasi-free-standing graphene.
Nano letters 2010;10(9):3360-6.
2010: Victor Yu Aristov; Grzegorz Urbanik; Kurt Kummer; Denis V Vyalikh; Olga V Molodtsova; Alexei B Preobrajenski; Alexei A Zakharov; Christian Hess; Torben Hänke; Bernd Büchner; Ivana Vobornik; Jun Fujii; Giancarlo Panaccione; Yuri A Ossipyan; Martin Knupfer
Graphene synthesis on cubic SiC/Si wafers. perspectives for mass production of graphene-based electronic devices.
Nano letters 2010;10(3):992-5.
2010: Mark H Rümmeli; Franziska Schäffel; Alicja Bachmatiuk; David Adebimpe; Geoff Trotter; Felix Börrnert; Andrew Scott; Emica Coric; Maria Sparing; Bernd Rellinghaus; Paul G McCormick; Gianaurelio Cuniberti; Martin Knupfer; Ludwig Schultz; Bernd Büchner
Investigating the outskirts of Fe and Co catalyst particles in alumina-supported catalytic CVD carbon nanotube growth.
ACS nano 2010;4(2):1146-52.
2009: Alicja Bachmatiuk; Felix Börrnert; Mandy Grobosch; Franziska Schäffel; Ulrike Wolff; Andrew Scott; Mujtaba Zaka; Jamie H Warner; Rüdiger Klingeler; Martin Knupfer; Bernd Büchner; Mark H Rümmeli
Investigating the graphitization mechanism of SiO(2) nanoparticles in chemical vapor deposition.
ACS nano 2009;3(12):4098-104.
2009: T Kroll; V Yu Aristov; O V Molodtsova; Yu A Ossipyan; Denis V Vyalikh; B Büchner; Martin Knupfer
Spin and orbital ground state of Co in cobalt phthalocyanine.
The journal of physical chemistry. A 2009;113(31):8917-22.
2009: Björn Bräuer; Mandy Grobosch; Martin Knupfer; Florian Weigend; Yana Vaynzof; Antoine Kahn; Tobias Rüffer; Georgeta Salvan
How photoelectron spectroscopy and quantum chemical studies can help understanding the magnetic properties of molecules: an example from the class of Cu(II)-bis(oxamato) complexes.
The journal of physical chemistry. B 2009;113(30):10051-4.
2009: A König; F Roth; R Kraus; Martin Knupfer
Electronic properties of potassium doped FePc from electron energy-loss spectroscopy.
The Journal of chemical physics 2009;130(21):214503.
2009: Heiko Peisert; I Biswas; L Zhang; B-E Schuster; M B Casu; A Haug; D Batchelor; Martin Knupfer; Thomas Chassé
Unusual energy shifts in resonant photoemission spectra of organic model molecules.
The Journal of chemical physics 2009;130(19):194705.
2009: Andreas Koitzsch; D S Inosov; D V Evtushinsky; VB Zabolotnyy; Alexander A Kordyuk; A Kondrat; C Hess; Martin Knupfer; Bernd Büchner; G L Sun; V Hinkov; Chengtian T Lin; A Varykhalov; Sergey V Borisenko
Temperature and doping-dependent renormalization effects of the low energy electronic structure of Ba1-xKxFe2As2 single crystals.
Physical review letters 2009;102(16):167001.
2009: VB Zabolotnyy; D S Inosov; D V Evtushinsky; Andreas Koitzsch; Alexander A Kordyuk; G L Sun; J T Park; D Haug; V Hinkov; A V Boris; Chengtian T Lin; Martin Knupfer; A N Yaresko; Bernd Büchner; A Varykhalov; R Follath; Sergey V Borisenko
(pi, pi) electronic order in iron arsenide superconductors.
Nature 2009;457(7229):569-72.
2008: S-L Drechsler; M Grobosch; K Koepernik; G Behr; A Köhler; J Werner; A Kondrat; N Leps; C Hess; Rüdiger Klingeler; R Schuster; Bernd Büchner; Martin Knupfer
Optical study of LaO0.9F0.1FeAs: evidence for a weakly coupled superconducting state.
Physical review letters 2008;101(25):257004.
2008: G Fuchs; S-L Drechsler; N Kozlova; G Behr; A Köhler; J Werner; K Nenkov; Rüdiger Klingeler; J Hamann-Borrero; C Hess; A Kondrat; M Grobosch; A Narduzzo; Martin Knupfer; J Freudenberger; Bernd Büchner; L Schultz
High-field pauli-limiting behavior and strongly enhanced upper critical magnetic fields near the transition temperature of an arsenic-deficient LaO0.9F0.1FeAs1-delta superconductor.
Physical review letters 2008;101(23):237003.
2008: Olga V Molodtsova; Martin Knupfer; Volodymyr V Maslyuk; Denis V Vyalikh; Victor M Zhilin; Yurii A Ossipyan; Thomas Bredow; Ingrid Mertig; Victor Yu Aristov
Unoccupied electronic states in an organic semiconductor probed with x-ray spectroscopy and first-principles calculations.
The Journal of chemical physics 2008;129(15):154705.
2008: Javier Luzon; Miguel Castro; Esther J M Vertelman; Régis Y N Gengler; Petra J van Koningsbruggen; Olga Molodtsova; Martin Knupfer; Petra Rudolf; P H M van Loosdrecht; Ria Broer
Prediction of the equilibrium structures and photomagnetic properties of the Prussian blue analogue RbMn[Fe(CN)6] by density functional theory.
The journal of physical chemistry. A 2008;112(25):5742-8.
2008: I Hellmann; Ch Täschner; Rüdiger Klingeler; A Leonhardt; Bernd Büchner; Martin Knupfer
Structure and electronic properties of Li-doped vanadium oxide nanotubes.
The Journal of chemical physics 2008;128(22):224701.
2008: F Roth; A König; R Kraus; Martin Knupfer
Potassium induced phase transition of FePc thin films.
The Journal of chemical physics 2008;128(19):194711.
2008: Alexander Grüneis; C Attaccalite; Thomas Pichler; VB Zabolotnyy; H Shiozawa; S L Molodtsov; D Inosov; Andreas Koitzsch; Martin Knupfer; J Schiessling; R Follath; R Weber; P Rudolf; L Wirtz; Angel Rubio
Electron-electron correlation in graphite: a combined angle-resolved photoemission and first-principles study.
Physical review letters 2008;100(3):037601.
2007: D S Inosov; Jörg Fink; Alexander A Kordyuk; Sergey V Borisenko; VB Zabolotnyy; R Schuster; Martin Knupfer; Bernd Büchner; R Follath; H A Dürr; W Eberhardt; V Hinkov; Bernhard Keimer; Helmuth Berger
Momentum and energy dependence of the anomalous high-energy dispersion in the electronic structure of high temperature superconductors.
Physical review letters 2007;99(23):237002.
2007: J Geck; Sergey V Borisenko; Helmuth Berger; H Eschrig; Jörg Fink; Martin Knupfer; K Koepernik; Andreas Koitzsch; Alexander A Kordyuk; VB Zabolotnyy; Bernd Büchner
Anomalous quasiparticle renormalization in Na0.73CoO2: role of interorbital interactions and magnetic correlations.
Physical review letters 2007;99(4):046403.
2007: K Flatz; M Grobosch; Martin Knupfer
The electronic properties of potassium doped copper-phthalocyanine studied by electron energy-loss spectroscopy.
The Journal of chemical physics 2007;126(21):214702.
2007: Heiko Peisert; Andreas Petr; Lothar Dunsch; Thomas Chassé; Martin Knupfer
Interface Fermi level pinning at contacts between PEDOT: PSS and molecular organic semiconductors.
Chemphyschem : a European journal of chemical physics and physical chemistry 2007;8(3):386-90.
2007: Costantino Zazza; Simone Meloni; Amedeo Palma; Martin Knupfer; Gonzalo G Fuentes; Roberto Car
Quasi-one-dimensional K-O chain in PTCDA thin films: evidence from first-principles calculations.
Physical review letters 2007;98(4):046401.
2006: J Geck; M von Zimmermann; Helmuth Berger; Sergey V Borisenko; H Eschrig; K Koepernik; Martin Knupfer; Bernd Büchner
Stripe correlations in Na(0.75)CoO2.
Physical review letters 2006;97(10):106403.
2006: Alexander A Kordyuk; Sergey V Borisenko; VB Zabolotnyy; J Geck; Martin Knupfer; Jörg Fink; Bernd Büchner; Chengtian T Lin; Bernhard Keimer; Helmuth Berger; A V Pan; Seiki Komiya; Yoichi Ando
Constituents of the quasiparticle spectrum along the nodal direction of high-Tc cuprates.
Physical review letters 2006;97(1):017002.
2006: Sergey V Borisenko; Alexander A Kordyuk; VB Zabolotnyy; J Geck; D Inosov; Andreas Koitzsch; Jörg Fink; Martin Knupfer; Bernd Büchner; V Hinkov; Chengtian T Lin; Bernhard Keimer; Th Wolf; S G Chiuzbăian; L Patthey; R Follath
Kinks, nodal bilayer splitting, and interband scattering in YBa2Cu3O(6+x).
Physical review letters 2006;96(11):117004.
2006: Sergey V Borisenko; Alexander A Kordyuk; Andreas Koitzsch; Jörg Fink; J Geck; VB Zabolotnyy; Martin Knupfer; Bernd Büchner; Helmuth Berger; M Falub; M Shi; J Krempasky; L Patthey
Parity of the pairing bosons in a high-temperature Pb-Bi2Sr2CaCu2O8 bilayer superconductor by angle-resolved photoemission spectroscopy.
Physical review letters 2006;96(6):067001.
2006: VB Zabolotnyy; Sergey V Borisenko; Alexander A Kordyuk; Jörg Fink; J Geck; Andreas Koitzsch; Martin Knupfer; Bernd Büchner; Helmuth Berger; A Erb; Chengtian T Lin; Bernhard Keimer; R Follath
Effect of Zn and Ni impurities on the quasiparticle renormalization of superconducting Bi-2212.
Physical review letters 2006;96(3):037003.
2005: Matthias Krause; Xianjie Liu; Joanna Wong; Thomas Pichler; Martin Knupfer; Lothar Dunsch
The electronic and vibrational structure of endohedral Tm3N@C80 (I) fullerene--proof of an encaged Tm3+.
The journal of physical chemistry. A 2005;109(32):7088-93.
2005: Mark H Rümmeli; Ewa Borowiak-Palen; Thomas Gemming; Thomas Pichler; Martin Knupfer; Martin Kalbác; Lothar Dunsch; Oliver Jost; S Ravi P Silva; Wolfgang Pompe; Bernd Büchner
Novel catalysts, room temperature, and the importance of oxygen for the synthesis of single-walled carbon nanotubes.
Nano letters 2005;5(7):1209-15.
2005: I Biswas; Heiko Peisert; T Schwieger; Danilo Dini; Michael Hanack; Martin Knupfer; T Schmidt; Thomas Chassé
Tetra-t-butyl magnesium phthalocyanine on gold: electronic structure and molecular orientation.
The Journal of chemical physics 2005;122(6):064710.
2004: Sergey V Borisenko; Alexander A Kordyuk; Andreas Koitzsch; Martin Knupfer; Jörg Fink; Helmuth Berger; Chengtian T Lin
Superconductors: time-reversal symmetry breaking?
Nature 2004;431(7004):1 p following 39.
2004: H Rauf; Thomas Pichler; Martin Knupfer; Jörg Fink; Hiromichi Kataura
Transition from a Tomonaga-Luttinger liquid to a fermi liquid in potassium-intercalated bundles of single-wall carbon nanotubes.
Physical review letters 2004;93(9):096805.
2004: Alexander A Kordyuk; Sergey V Borisenko; Andreas Koitzsch; Jörg Fink; Martin Knupfer; Bernd Büchner; Helmuth Berger; G Margaritondo; Chengtian T Lin; Bernhard Keimer; S Ono; Yoichi Ando
Manifestation of the magnetic resonance mode in the nodal quasiparticle lifetime of the superconducting cuprates.
Physical review letters 2004;92(25 Pt 1):257006.
2004: Sergey V Borisenko; Alexander A Kordyuk; Andreas Koitzsch; TK Kim; K A Nenkov; Martin Knupfer; Jörg Fink; C Grazioli; Stefano Turchini; Helmuth Berger
Circular dichroism in angle-resolved photoemission spectra of under- and overdoped Pb-Bi2212.
Physical review letters 2004;92(20):207001.
2003: TK Kim; Alexander A Kordyuk; Sergey V Borisenko; Andreas Koitzsch; Martin Knupfer; Helmuth Berger; Jörg Fink
Doping dependence of the mass enhancement in (Pb,Bi)2Sr2CaCu2O8 at the antinodal point in the superconducting and normal states.
Physical review letters 2003;91(16):167002.
2003: A S Moskvin; J Málek; Martin Knupfer; R Neudert; Jörg Fink; R Hayn; SL Drechsler; N Motoyama; Hiroshi Eisaki; S Uchida
Evidence for two types of low-energy charge transfer excitations in Sr2CuO3.
Physical review letters 2003;91(3):037001.
2003: Sergey V Borisenko; Alexander A Kordyuk; TK Kim; Andreas Koitzsch; Martin Knupfer; Jörg Fink; M S Golden; M Eschrig; Helmuth Berger; R Follath
Anomalous enhancement of the coupling to the magnetic resonance mode in underdoped Pb-Bi2212.
Physical review letters 2003;90(20):207001.
2003: Ewa Borowiak-Palen; Thomas Pichler; G G Fuentes; B Bendjemil; X Liu; A Graff; G Behr; R J Kalenczuk; Martin Knupfer; Jörg Fink
Infrared response of multiwalled boron nitride nanotubes.
Chemical communications (Cambridge, England) 2003;(1):82-3.
2002: Alexander A Kordyuk; Sergey V Borisenko; TK Kim; K A Nenkov; Martin Knupfer; Jörg Fink; M S Golden; Helmuth Berger; R Follath
Origin of the peak-dip-hump line shape in the superconducting-state (pi,0) photoemission spectra of Bi2Sr2CaCu2O8.
Physical review letters 2002;89(7):077003.
2002: A G Marinopoulos; Lucia Reining; Valerio Olevano; Angel Rubio; Thomas Pichler; X Liu; Martin Knupfer; Jörg Fink
Anisotropy and interplane interactions in the dielectric response of graphite.
Physical review letters 2002;89(7):076402.