skip to content

Articles

2017

T. Knispel, W. Jolie, N. Borgwardt, J. Lux, Zhiwei Wang, Yoichi Ando, A. Rosch, T. Michely, M. Grüninger
Charge puddles in the bulk and on the surface of the topological insulator BiSbTeSe2 studied by scanning tunneling microscopy and optical spectroscopy
Phys. Rev. B, 96, 195135, 2017, arXiv:1708.09166

A. Koitzsch, E. Müller, M. Knupfer, B. Büchner, D. Nowak, A. Isaeva, T. Doert, M. Grüninger, S. Nishimoto, J. van den Brink
Low temperature enhancement of ferromagnetic Kitaev correlations in $\alpha$-RuCl$_3$
Submitted , Phys. Rev. Lett., 2017, arXiv:1709.02712

2016

R.B. Versteeg, I. Vergara, D. Schäfer, D. Bischoff, A. Aqeel, T.T.M. Palstra, M. Grüninger, P.H.M. van Loosdrecht
Optically probed symmetry breaking in the chiral magnet Cu2 OSeO3
Phys. Rev. B, 94, 094409, 9, 2016

F. Randi, I. Vergara, F. Novelli, M. Esposito, M. Dell’Angela, V. A. M. Brabers, P. Metcalf, R. Kukreja, H. A. Dürr, D. Fausti, M. Grüninger, F. Parmigiani
Phase separation in the non-equilibrium Verwey transition in magnetite
Phys. Rev. B, 93, 054305, 2016, http://journals.aps.org/prb/abstract/10.1103/PhysRevB.93.054305, arXiv:1509.04550

N. Borgwardt, J. Lux, I. Vergara, Zhiwei Wang, A.A. Taskin, Kouji Segawa, P.H.M. van Loosdrecht, Yoichi Ando, A. Rosch, M. Grüninger
Revealing puddles of electrons and holes in compensated topological insulators
Phys. Rev. B, 93, 245149, 2016, http://journals.aps.org/prb/abstract/10.1103/PhysRevB.93.245149, arXiv:1508.03212

2015

K. Thirunavukkuarasu, M. Langenbach, A. Roggenbuck, E. Vidal, H. Schmitz, J. Hemberger, M. Grüninger
Self-normalizing phase measurement in multimode terahertz spectroscopy based on photomixing of three lasers
Appl. Phys. Lett., 106, 031111, 2015, http://scitation.aip.org/content/aip/journal/apl/106/3/10.1063/1.4906374, arXiv:1410.0648, PDF (1191 kB)

2014

Stefan Schumacher, Felix Huttmann, Marin Petrovic, Christian Witt, Daniel F. Förster, Chi Vo-Van, Johann Coraux, Antonio J. Martinez-Galera, Violetta Sessi, Ignacio Vergara, Reinhard Rückamp, Markus Grüninger, Nicolas Schleheck, Frank Meyer zu Heringdorf, Philippe Ohresser, Marko Kralj, Tim O. Wehling, Thomas Michely
Europium underneath graphene on Ir(111): Intercalation mechanism, magnetism, and band structure
Phys. Rev. B, 90, 235437, 2014, arXiv:1409.4272

T. Möller, P. Becker, L. Bohaty, J. Hemberger, M. Grüninger
Infrared-active phonon modes in monoclinic multiferroic MnWO4
Phys. Rev. B, 90, 155105, 2014, arXiv:1406.6313

M. Langenbach, A. Roggenbuck, I. Cámara Mayorga, A. Deninger, K. Thirunavukkuarasu, J. Hemberger, M. Grüninger
Group delay in THz spectroscopy with ultra-wideband log-spiral antennae
J. Infrared Milli. THz Waves, 35, 918-931, 2014, http://link.springer.com/article/10.1007/s10762-014-0098-4, arXiv:1406.6589

F. Novelli, G. De Filippis, V. Cataudella, M. Esposito, I. Vergara , F. Cilento, E. Sindici, A. Amaricci, C. Giannetti, D. Prabhakaran , S. Wall, A. Perucchi, S. Dal Conte, G. Cerullo, M. Capone , A. Mishchenko, M. Grüninger, N. Nagaosa, F. Parmigiani, D. Fausti
Witnessing the formation and relaxation of massive quasi-particles in a strongly correlated electron system
Nat. Commun., 5, 5112, 2014, http://www.nature.com/ncomms/2014/141007/ncomms6112/full/ncomms6112.html, arXiv:1403.1704

2013

E. Benckiser, L. Fels, G. Ghiringhelli, M. Moretti Sala, T. Schmitt, J. Schlappa, V. N. Strocov, N. Mufti, G. R. Blake, A. A. Nugroho, T. T. M. Palstra, M. W. Haverkort, K. Wohlfeld, M. Grüninger
Orbital superexchange and crystal field simultaneously at play in YVO3: resonant inelastic x-ray scattering at the V L edge and the O K edge
Phys. Rev. B, 88, 205115, 2013, http://prb.aps.org/abstract/PRB/v88/i20/e205115

A. Roggenbuck, M. Langenbach, K. Thirunavukkuarasu, H. Schmitz, A. Deninger, I. Camara Mayorga, R. Güsten, J. Hemberger, M. Grüninger
Enhancing the stability of a continuous-wave terahertz system by photocurrent normalization
J. Opt. Soc. Am. B, 30, 1397, 2013, http://www.opticsinfobase.org/josab/abstract.cfm?uri=josab-30-6-1397, arXiv:1302.3475

J. Reul, L. Fels, N. Qureshi, K. Shportko, M. Braden, M. Grüninger
Temperature-dependent optical conductivity of layered LaSrFeO4
Phys. Rev. B, 87, 205142, 2013, http://prb.aps.org/abstract/PRB/v87/i20/e205142, arXiv:1303.0709, PDF (835 kB)

2012

A. Roggenbuck, K. Thirunavukkuarasu, H. Schmitz, J. Marx, A. Deninger, I. Cámara Mayorga, R. Güsten, J. Hemberger, M. Grüninger
Using a fiber stretcher as a fast phase modulator in a continuous-wave terahertz spectrometer
J. Opt. Soc. Am. B, 29, 614, 2012, http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-4-614

J. Reul, A. A. Nugroho, T. T. M. Palstra, M. Grüninger
Probing orbital fluctuations in RVO3 (R = Y, Gd, or Ce) by ellipsometry
Phys. Rev. B, 86, 125128, 2012, http://link.aps.org/doi/10.1103/PhysRevB.86.125128

F. Novelli, D. Fausti, J. Reul, F. Cilento, P. H. M. van Loosdrecht, A. A. Nugroho, T. T. M. Palstra, M. Grüninger, F. Parmigiani
Hubbard exciton revealed by time-domain optical spectroscopy
Phys. Rev. B, 86, 165135, 2012, http://link.aps.org/doi/10.1103/PhysRevB.86.165135

2011

A. C. Komarek, T. Möller, M. Isobe, Y. Drees, H. Ulbrich, M. Azuma, M. T. Fernández-Díaz, A. Senyshyn, M. Hoelzel, G. André, Y. Ueda, M. Grüninger, M. Braden
Magnetic order, transport and infrared optical properties in the ACrO3 system (A = Ca, Sr, and Pb)
Phys. Rev. B, 84, 125114, 2011, http://link.aps.org/doi/10.1103/PhysRevB.84.125114

2010

A. Roggenbuck, H. Schmitz, A. Deninger, I.C. Mayorga, J. Hemberger, R. Güsten, M. Grüninger
Coherent broadband continuous-wave terahertz spectroscopy on solid-state samples
New J. Phys., 12, 043017, 2010

2008

A. Gössling, R. Schmitz, H. Roth, M.W. Haverkort, T. Lorenz, J.A. Mydosh, E. Müller-Hartmann, M. Grüninger
Mott-Hubbard exciton in the optical conductivity of YTiO3 and SmTiO3
Phys. Rev. B, 78, 075122, 2008, arXiv:cond-mat/0608531, PDF (378 kB)

A. Gössling, M.W. Haverkort, M. Benomar, Hua Wu, D. Senff, T. Möller, M. Braden, J.A. Mydosh, M. Grüninger
Mott-Hubbard versus charge-transfer behavior in LaSrMnO4 studied via optical conductivity
Phys. Rev. B, 77, 03, 035109, 2008, arXiv:0709.3711, PDF (835 kB)

E. Benckiser, R. Rückamp, T. Möller, T. Taetz, A. Möller, A. A. Nugroho, T. T. M. Palstra, G. S. Uhrig, M. Grüninger
Collective orbital excitations in orbitally ordered YVO3 and HoVO3
New J. Phys., 10, 053027, 2008, PDF (2459 kB)

A. C. Komarek, S.V. Streltsov, M. Isobe, T. Möller, M. Hoelzel, A. Senyshyn, D. Trots, M. T. Fernandez-Dıaz, T. Hansen, H. Gotou, T. Yagi, Y. Ueda, V. I. Anisimov, M. Grüninger, D. I. Khomskii, M. Braden
CaCrO3: An Anomalous Antiferromagnetic Metallic Oxide
Phys. Rev. Lett., 101, 167204, 2008, PDF (541 kB)

2007

K. P. Schmidt, M. Grüninger, G. S. Uhrig
Fate of orbitons coupled to phonons
Phys. Rev. B, 76, 075108, 2007, PDF (440 kB)

2006

C. Ulrich, A. Gössling, M. Grüninger, M. Guennou, H. Roth, M. Cwik, T. Lorenz, G. Khaliullin, B. Keimer
Raman Scattering in the Mott Insulators LaTiO3 and YTiO3: Evidence for Orbital Excitations
Phys. Rev. Lett., 97, 157401, 2006, arXiv.org:cond-mat/0503106, PDF (1261 kB)

2005

R. Rückamp, J. Baier, M. Kriener, M.W. Haverkort, T. Lorenz, G.S. Uhrig, L. Jongen, A. Möller, G. Meyer, M. Grüninger
Zero-field incommensurate spin-Peierls phase with interchain frustration in TiOCl
Phys. Rev. Lett., 95, 097203, 2005, arXiv.org:cond-mat/0503409, PDF (365 kB)

R. Rückamp, E. Benckiser, M.W. Haverkort, H. Roth, T. Lorenz, A. Freimuth, L. Jongen, A. Möller, G. Meyer, P. Reutler, B. Büchner, A. Revcolevschi, S.-W. Cheong, C. Sekar, G. Krabbes, M. Grüninger
Optical study of orbital excitations in transition-metal oxides
New J. Phys., 7, 1, 144, 2005, arXiv.org:cond-mat/0503405, PDF (1463 kB)

G.S. Uhrig, K.P. Schmidt, M. Grüninger
Magnetic Excitations in Bilayer High-Temperature Superconductors with Stripe Correlations
J. Phys. Soc. Jpn. Suppl., 74, 86, 2005, http://jpsj.ipap.jp/link?JPSJS/74S/86/, arXiv:cond-mat/0502460, PDF (913 kB)

A. Gössling, T. Möller, W.-D. Stein, P. Becker, L. Bohaty, M. Grüninger
Phonon modes of monoclinic BiB3O6
Phys. Stat. Sol. B, 242, R85, 2005, arXiv:cond-mat/0505556, PDF (418 kB)

K.P. Schmidt, A. Gössling, U. Kuhlmann, C. Thomsen, A. Löffert, C. Gross, W. Assmus
Raman Response of Magnetic Excitations in Cuprate Ladders and Planes
Phys. Rev. B, 72, 094419, 2005, arXiv:cond-mat/0503558, PDF (392 kB)

G.S. Uhrig, K.P. Schmidt, M. Grüninger
Magnetic excitations in the stripe phase of high-Tc superconductors
J. Magn. Magn. Mater., 290-291, 330, 2005, arXiv:cond-mat/0407648, PDF (259 kB)

2004

A.B. Kuzmenko, N. Tombros, F.P. Mena, A. Hadipour, H.J.A. Molegraaf, D. van der Marel, M. Grüninger, S. Uchida
Redistribution of the c-axis spectral weight and conductivity sum rules in LSCO as revealed by optical transmission
Physica C, 408-10, 330, 2004, PDF (227 kB)

G.S. Uhrig, K.P. Schmidt, M. Grüninger
Unifying Magnons and Triplons in Stripe-Ordered Cuprate Superconductors
Phys. Rev. Lett., 93, 267003, 2004, arXiv:cond-mat/0402659, PDF (229 kB)

2003

K.P. Schmidt, C. Knetter, M. Grüninger, G.S. Uhrig
Charge-order-induced sharp Raman peak in Sr14Cu24O41
Phys. Rev. Lett., 90, 16, 167201, 2003, arXiv:cond-mat/0210092, PDF (187 kB)

M. Grüninger, M. Windt, E. Benckiser, T.S. Nunner, K.P. Schmidt, G.S. Uhrig, T. Kopp
Optical Spectroscopy of Low-Dimensional Quantum Spin Systems
Adv. Sol. State Phys., 43, 95, 2003, PDF (1349 kB)

M. Hofmann, T. Lorenz, K. Berggold, M. Grüninger, A. Freimuth, G.S. Uhrig, E. Brück
Evidence for a large magnetic heat current in insulating layered cuprates
Phys. Rev. B, 67, 18, 184502, 2003, arXiv:cond-mat/0301093, PDF (64 kB)

A.B. Kuzmenko, N. Tombros, H.J.A. Molegraaf, M. Grüninger, D. van der Marel, S. Uchida
C-axis Optical Sum Rule and a Possible New Collective Mode in La2-xSrxCuO4
Phys. Rev. Lett., 91, 3, 037004, 2003, arXiv:cond-mat/0302394, PDF (278 kB)

T.S. Nunner, P. Brune, T. Kopp, M. Windt, M. Grüninger
Phonon-assisted magnetic absorption of (La,Ca)14Cu24O41: contribution of different phonon modes
Act. Phys. Pol. B, 34, 22, 1545, 2003, http://th-www.if.uj.edu.pl/acta/vol34/abs/v34p1545.htm, PDF (227 kB)

G.S. Uhrig, M. Grüninger
Das Wechselspiel magnetischer Anregungen in Spinflüssigkeiten
Physik Journal, 1, 41, 2003, http://www.pro-physik.de/Phy/pdfstart.do?mid=3&articleid=17027&recordid=17064

2002

M. Grüninger, R. Rückamp, M. Windt, P. Reutler, C. Zobel, T. Lorenz, A. Freimuth, A. Revcolevschi
Experimental Quest for Orbital Waves
Nature (London), 418, 39, 2002

M. Grüninger, M. Windt, T. Nunner, C. Knetter, K.P. Schmidt, G.S. Uhrig, T. Kopp, A. Freimuth, U. Ammerahl, B. Büchner, A. Revcolevschi
Optical Spectroscopy of (La,Ca)14Cu24O41 spin ladders: comparison of experiment and theory
Physica B, 312-313, 617, 2002, arXiv:cond-mat/0108437, PDF (97 kB)

M. Grüninger, M. Windt, T. Nunner, C. Knetter, K.P. Schmidt, G.S. Uhrig, T. Kopp, A. Freimuth, U. Ammerahl, B. Büchner, A. Revcolevschi
Magnetic Excitations in Two-leg Spin 1/2 ladders: Experiment and Theory
J. Phys. Chem. Sol., 63, 2167, 2002, arXiv:cond-mat/0109524, PDF (845 kB)

V. Kataev, K.-Y.Choi, M. Grüninger, U. Ammerahl, B. Büchner, A. Freimuth, A. Revcolevschi
ESR Study of (Sr,La,Ca)14Cu24O41
Physica B, 312-313, 614, 2002, arXiv:cond-mat/0108512, PDF (108 kB)

T.S. Nunner, P. Brune, T. Kopp, M. Windt, M. Grüninger
Cyclic spin exchange in cuprate spin ladders
Phys. Rev. B, 66, 180404(R), 2002, arXiv:cond-mat/0203472, PDF (256 kB)

C. Zobel, M. Kriener, D. Bruns, J. Baier, M. Grüninger, T. Lorenz, P. Reutler, A. Revcolevschi
Evidence for a low-spin to intermediate-spin state transition in LaCoO3
Phys. Rev. B, 66, 020402(R), 2002, arXiv:cond-mat/0205479, PDF (81 kB)

T. Lorenz, M. Hofmann, M. Grüninger, A. Freimuth, G.S. Uhrig, M. Dumm, M. Dressel
Evidence for spin-charge separation in quasi-one-dimensional organic conductors (This article has been retracted!)
Nature (London), 418, 614, 2002, PDF (51 kB)

2001

V. Kataev, K.-Y. Choi, M. Grüninger, U. Ammerahl, B. Büchner, A. Freimuth, A. Revcolevschi
Strong Anisotropy of Superexchange in the Copper-Oxygen Chains of La14-xCaxCu24O41
Phys. Rev. Lett., 86, 2882, 2001, arXiv:cond-mat/0101040, PDF (173 kB)

V. Kataev, K.-Y. Choi, M. Grüninger, U. Ammerahl, B. Büchner, A. Freimuth, A. Revcolevschi
Interplay of spin and charge dynamics in Sr14-xCaxCu24O41
Phys. Rev. B, 64, 104422, 2001, PDF (525 kB)

C. Knetter, K.P. Schmidt, M. Grüninger , G.S. Uhrig
Fractional and Integer Excitations in Quantum Antiferromagnetic Spin 1/2 Ladders
Phys. Rev. Lett., 87, 167204, 2001, arXiv:cond-mat/0106077, PDF (173 kB)

M. Windt, M. Grüninger, T. Nunner, C. Knetter, K. Schmidt, G.S. Uhrig, T. Kopp, A. Freimuth, U. Ammerahl, B. Büchner, A. Revcolevschi
Observation of two-magnon bound states in the two-leg ladders of (Ca,La)14Cu24O41
Phys. Rev. Lett., 87, 127002, 2001, arXiv:cond-mat/0103438, PDF (191 kB)

2000

D. van der Marel, A. Tsvetkov, M. Grüninger, D. Dulic, H.J. Molegraaf
C-axis optical properties of high Tc cuprates
Physica C, 341, 1531, 2000, PDF (232 kB)

M. Grüninger, D. van der Marel, A. Damascelli, A. Erb, T. Nunner, T. Kopp
Midinfrared absorption in YBa2Cu3O6: Evidence for a failure of spin-wave theory for spin 1/2 in two dimensions
Phys. Rev. B, 62, 12422, 2000, PDF (146 kB)

M. Grüninger, D. van der Marel, A.A. Tsvetkov, A. Erb
Observation of out-of-phase bilayer plasmons in YBa2Cu3O7-δ
Phys. Rev. Lett., 84, 1575, 2000, PDF (252 kB)

1999

M. Grüninger, D. van der Marel, A. Damascelli, A. Zibold, H.P. Geserich, A. Erb, M. Kläser, Th. Wolf, T. Nunner, T. Kopp
Charged magnons and magneto-elastic polarons in the mid-infrared spectrum of YBa2Cu3O6
Physica C, 317-18, 286, 1999, PDF (189 kB)

1998

M. Grüninger, D. van der Marel, H.P. Geserich, Th. Wolf, A. Erb, T. Kopp
Infrared spectroscopy on Y1-xRExBa2Cu3-yZnyO6 (RE=Pr, Gd, x=0 and 0.8; y=0 and ≈0.15)
Physica B, 244, 60, 1998, PDF (347 kB)

A. Damascelli, D. van der Marel, M. Grüninger, C. Presura, T.T.M. Palstra, J. Jegoudez, A. Revcolevschi
Direct two-magnon optical absorption in α'-NaV2O5: ``charged" magnons
Phys. Rev. Lett., 81, 918, 1998, PDF (274 kB)

A.A. Tsvetkov, D. van der Marel, K.A. Moler, J.R. Kirtley, J.L. de Boer, A. Meetsma, Z.F. Ren, N. Koleshnikov, D. Dulic, A. Damascelli, M. Grüninger, J. Schützmann, J.W. van der Eb, H.S. Somal, J.H. Wang
Global and local measures of the intrinsic Josephson coupling in Tl2Ba2CuO6 as a test of the interlayer tunneling model
Nature (London), 395, 360, 1998

1997

A. Zibold, H.L. Liu, D.B. Tanner, J.Y. Wang, M. Grüninger, H.P. Geserich, T. Kopp, Th. Wolf, W. Widder, H.F. Braun
Optical study of antiferromagnetic single crystals Y1-xPrxBa2Cu3O6 in high magnetic fields
Phys. Rev. B, 55, 11096, 1997, PDF (172 kB)

1996

M. Grüninger, D. van der Marel, P.J.M. van Bentum, A. Erb, H.P. Geserich, T. Kopp
Far- and mid-infrared spectrum of YBa2Cu3O6.0 in high magnetic fields
J. Low Temp. Phys., 105, 389, 1996, PDF (332 kB)

M. Grüninger, D. van der Marel, P.J.M. van Bentum, A. Erb, Th. Wolf, T. Kopp
Probing the mid-infrared spectrum of YBa2Cu3O6.0 with high magnetic fields and Zinc doping
Czech. J. Phys., 46 (S2), 1127, 1996, PDF (182 kB)

M. Grüninger, J. Münzel, A. Gaymann, A. Zibold, H.P. Geserich, T. Kopp
Spin-waves in the mid-infrared spectrum of antiferromagnetic YBa2Cu3O6.0
Europhys. Lett., 35, 55, 1996, PDF (623 kB)

In Proceedings

2009

A. Roggenbuck, A. Deninger, I.C. Mayorga, H. Schmitz, J. Hemberger, F. Lison, M. Grüninger
CW Terahertz Spectrometer with High-Precision Frequency Control
, 2009 CONFERENCE ON LASERS AND ELECTRO-OPTICS AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (CLEO/QELS 2009),, 2009

A. Deninger, A. Roggenbuck, S. Schindler, I. Camara Mayorga, H. Schmitz, J. Hemberger, R. Güsten, M. Grüninger
Cw THz Spectrometer with High-Precision Frequency Control
, Conference on Lasers and Electro-Optics and Quantum Electronics and Laser Science (CLEO/QELS 2009), Vols. 1-5, 2009

A. Deninger, A. Roggenbuck, S. Schindler, I. Camara Mayorga, H. Schmitz, J. Hemberger, R. Güsten, M. Grüninger
Cw THz Spectrometer with High SNR and MHz Frequency Resolution
, 34th International Conference on Infrared, Millimeter, and Terahertz waves, Vols. 1 and 2, 2009