GSC 260:  Bonn-Cologne Graduate School of Physics and Astronomy (BCGS)

• Subject Area: Condensed Matter Physics ; Astrophysics and Astronomy ; Optics, Quantum Optics and Physics of Atoms, Molecules and Plasmas ; Statistical Physics, Nonlinear Dynamics, Complex Systems, Soft and Fluid Matter, Biological Physics ; Particles, Nuclei and Fields
• Term: from 2007 to 2019
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 49599460

• Final Report Year: 2019

Final Report Abstract

The Bonn-Cologne Graduate School of Physics and Astronomy (BCGS) is a joint graduate school of the Bonn and Cologne universities. The research profiles of the two physics departments in Bonn and Cologne are largely complementary, resulting in a graduate school covering a broad range of research; from astrophysics, biophysics and condensed matter research to particle physics, quantum optics and string theory. The BCGS runs a five-year integrated program, which leads students with a bachelor's degree through an MSc phase to doctoral studies. The BCGS was launched in 2006 with a small class of so-called “honors students'”, who were chosen on a competitive basis. The honors students received scholarships, mentoring, and travel grants. They also had the opportunity to participate in research internships. Since 2012, the BCGS comprises almost all physics and astrophysics graduate students in Bonn and Cologne, while continuing to support a competitive class of honors students. The integrated model of a graduate school, which combines the MSc and PhD into a single program, has turned out to be particularly attractive to international students. It allows them to gain graduate qualification within the German system based on a broad range of courses, before choosing a particular research area for the PhD. Today, a third of our MSc students come from abroad, in part attracted by highly competitive "qualifying scholarships" covering the cost of living during the MSc phase. The teaching program of the BCGS is characterized by the principles of "research early on" during the MSc phase and "continued learning" during the PhD phase. The combination of research and learning is realized through research internships (MSc) and so-called intensive weeks on current topics of research. In addition, the BCGS offers a wide range of advanced courses given by our BCGS lecturers, regular faculty, and by external speakers. A mentoring scheme and networking events like the BCGS weekend and poster sessions promote a sense of shared identity among our students. The BCGS has also shaped the research community in the two physics departments. Strategic faculty appointments were made in astrophysics, biophysics, and quantum optics, often complementing existing experimental groups with new theoretical groups and vice versa.

Link to the final report

https://dx.doi.org/10.2314/KXP:1698293607

Publications

• Prospects for the measurement of the structure of the coupling of a Higgs boson to weak gauge bosons in weak boson fusion with the ATLAS detector. Eur. Phys. J. C 51, 385 (2007)
  C. Ruwiedel, M. Schumacher, N. Wermes
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• Supersymmetric NLO QCD corrections to resonant slepton production and signals at the Tevatron and the CERN LHC. Phys. Rev. D 75, 035003 (2007)
  H. K. Dreiner, S. Grab, M. Kramer, M. K. Trenkel
  (See online at https://doi.org/10.1103/PhysRevD.75.035003)
• Why your model parameter confidences might be too optimistic. Unbiased estimation of the inverse covariance matrix. A&A 464, 399 (2007)
  J. Hartlap, P. Simon, P. Schneider
  (See online at https://doi.org/10.1051/0004-6361:20066170)
• Kondo volume collapse, Kondo breakdown, and Fermi surface transitions in heavyfermion metals. Phys. Rev. B 77, 134439 (2008)
  A. Hackl, M. Vojta
  (See online at https://doi.org/10.1103/PhysRevB.77.134439)
• The removal of shear-ellipticity correlations from the cosmic shear signal via nulling techniques. A&A 488, 829 (2008)
  B. Joachimi, P. Schneider
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• Color-Octet Scalars of N=2 Supersymmetry at the LHC. Phys. Lett. B 672, 246 (2009)
  S.Y. Choi, M. Drees, J. Kalinowski, J.M. Kim, E. Popenda, P.M. Zerwas
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• Directed Transport of Atoms in a Hamiltonian Quantum Ratchet. Science 326, 1241 (2009)
  T. Salger, S. Kling, T. Hecking, C. Geckeler, L. Morales-Molina, M. Weitz
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• Distance Dependence of Entanglement Generation via a Bosonic Heat Bath. Phys. Rev. Lett. 102, 160501 (2009)
  T. Zell, F. Queisser, R. Klesse
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• Isospin breaking in the pion-nucleon scattering lengths. Phys. Lett. B 678, 65 (2009)
  M. Hoferichter, B. Kubis, U.-G. Meißner
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• Measuring tau-polarisation in neutralino2-decays at the LHC. JHEP 04, 057 (2009)
  T. Nattermann, K. Desch, P. Wienemann, C. Zendler
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• Optical cleaning of congruent lithium niobate crystals. Nature Photonics 3, 510 (2009)
  M. Kösters , B. Sturman, P. Werheit, D. Haertle, K. Buse
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• Quantum Walk in Real Space with Single Optically Trapped Atoms. Science 325 (5937), 174 (2009)
  M. Karski, L. Förster, J.-M. Choi, A. Steffen, W. Alt, D. Meschede, A. Widera
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• The D5-brane effective action and superpotential in N=1 compactifications. Nucl. Phys. B 816, 139 (2009)
  T. W. Grimm, T.-W. Ha, A. Klemm, D. Klevers
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• Bose-Einstein condensation of photons in an optical microcavity. Nature 468, 545 (2010)
  J. Klärs, J. Schmitt, F. Vewinger, M. Weitz
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• Equilibration Rates and Negative Absolute Temperatures for Ultracold Atoms in Optical Lattices. Phys. Rev. Lett. 105, 220405 (2010)
  A. Rapp, S. Mandt, A. Rosch
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• Evidence of the accelerated expansion of the Universe from weak lensing tomography with COSMOS. A&A 516, A63 (2010)
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• Optical control of the refractive index of a single atom. Phys. Rev. Lett. 105, 153603 (2010)
  T. Kampschulte, W. Alt, S. Brakhane, M. Eckstein, R. Reimann, A. Widera, D. Meschede
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• Record-breaking temperatures reveal a warming climate. EPL 92, 30008 (2010)
  G. Wergen, J. Krug
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• Rotational transitions of CH2D+ determined by high-resolution IR spectroscopy. A&A 516, L3 (2010)
  S. Gärtner, J. Krieg, A. Klemann, O. Asvany, S. Schlemmer
  (See online at https://doi.org/10.1051/0004-6361/201014877)
• Spin Transfer Torques in MnSi at Ultralow Current Densities. Science 330, 1648 (2010)
  F. Jonietz, K. Everschor, A. Rosch, et al.
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• The extreme luminosity states of Sagittarius A*. A&A 512, A2 (2010)
  N. Sabha, A. Eckart, et al.
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• Adaptive walks and extreme value theory. Phys. Rev. Lett. 107, 178102 (2011)
  J. Neidhart, J. Krug
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• Balanced superconductor-insulator-superconductor mixer on a 9 mm silicon membrane. Supercond. Sci. Technol. 24, 085012 (2011)
  M.P. Westig, K. Jacobs, J. Stutzki, M. Schultz, M. Justen, C.E. Honingh
  (See online at https://doi.org/10.1088/0953-2048/26/3/039502)
• Emergent Neutrality in Adaptive Asexual Evolution. Genetics 189, 1361 (2011)
  S. Schiffels, G. Szöllösi, V. Mustonen, and M. Lässig
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• Enhanced Quadrupole Collectivity at N=40: The Case of Neutron-Rich Fe Isotopes. Phys. Rev. Lett. 106, 022502 (2011)
  W. Rother, M. Hackstein, J. Jolie, et al.
  (See online at https://doi.org/10.1103/PhysRevLett.106.022502)
• Exome sequencing identifies frequent mutation of the SWI/SNF complex gene PBRM1 in renal carcinoma. Nature 469, 539 (2011)
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• Measurement of the top quark-pair production cross section with ATLAS in pp collisions at E_cm=7 TeV. Eur. Phys. J. C71, 1577 (2011)
  The ATLAS collaboration including I. Brock, M. Cristinziani, K. Desch, J. Dingfelder, S. Fleischmann, M. Lehmacher, G. Nunes-Hanninger, S. Psoroulas, B. Radics, C. Ruwiedel, K. Schmieden, J. Therhaag, N. Wermes
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• Modeling the clustering of dark-matter haloes in resummed perturbation theories. MNRAS 416, 1703 (2011)
  A. Elia, S. Kulkarni, C. Porciani, M. Pietroni, S. Matarrese
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• Stau as the lightest supersymmetric particle in R-parity violating supersymmetric models: Discovery potential with early LHC data. Phys. Rev. D 83, 015013 (2011)
  K. Desch, S. Fleischmann, P. Wienemann, H. K. Dreiner, S. Grab
  (See online at https://doi.org/10.1103/PhysRevD.83.015013)
• Volume Dependence of Bound States with Angular Momentum. Phys. Rev. Lett. 107, 112001 (2011)
  S. König, D. Lee, H.-W. Hammer
  (See online at https://doi.org/10.1103/PhysRevLett.107.112001)
• A Particle Consistent with the Higgs Boson Observed with the ATLAS Detector at the Large Hadron Collider. Science 338, 1576 (2012)
  ATLAS Collaboration, including J. Kraus, M. Lehmacher, S. Psoroulas, K. Schmieden, M. Schmitz, T. Schwindt, J. Therhaag, J.-W. Tsung
  (See online at https://doi.org/10.1126/science.1232005)
• Bayesian Feedback Control of a Two-Atom Spin-State in an Atom-Cavity System. Phys. Rev. Lett. 109, 173601 (2012)
  S. Brakhane, W. Alt, T. Kampschulte, M. Martinez-Dorantes, R. Reimann, S. Yoon, A. Widera and D. Meschede
  (See online at https://doi.org/10.1103/PhysRevLett.109.173601)
• Binary Interaction Dominates the Evolution of Massive Stars. Science 337, 6093 (2012)
  H. Sana, S.E. de Mink, A. de Koter, N. Langer, C.J. Evans, M. Gieles, E. Gosset, R.G. Izzard, J.-B. Le Bouquin, F.R.N. Schneider
  (See online at https://doi.org/10.1126/science.1223344)
• Correlations of record events as a test for heavy-tailed distributions. Phys. Rev. Lett. 108, 064101 (2012)
  J. Franke, G. Wergen, J. Krug
  (See online at https://doi.org/10.1103/PhysRevLett.108.064101)
• Emergent electrodynamics of skyrmions in a chiral magnet. Nature Physics 8, 301 (2012)
  T. Schulz, R. Ritz, A. Bauer, M. Halder, M. Wagner, C. Franz, C. Pfleiderer, K. Everschor, M. Garst and A. Rosch
  (See online at https://doi.org/10.1038/NPHYS2231)
• Mean-field theory for the inverse Ising problem at low temperatures H.C. Nguyen and J. Berg. Phys. Rev. Lett. 109, 050602 (2012)
  H.C. Nguyen and J. Berg
  (See online at https://doi.org/10.1103/PhysRevLett.109.050602)
• Mott metal-insulator transition on compressible lattices. Phys. Rev. Lett. 109, 176401 (2012)
  M. Zacharias, L. Bartosch, and M. Garst
  (See online at https://doi.org/10.1103/PhysRevLett.109.176401)
• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC. Phys. Lett. B 716, 1 (2012)
  ATLAS Collaboration, including J. Kraus, M. Lehmacher, S. Psoroulas, K. Schmieden, M. Schmitz, T. Schwindt, J. Therhaag, J.-W. Tsung
  (See online at https://doi.org/10.1016/j.physletb.2012.08.020)
• Quantum Gravitational Contributions to the Cosmic Microwave Background Anisotropy Spectrum. Phys. Rev. Lett. 108, 021301 (2012)
  C. Kiefer, M. Krämer
  (See online at https://doi.org/10.1103/PhysRevLett.108.021301)
• Signal and noise of Diamond Pixel Detectors at High Radiation Fluences. JINST 7, P09009 (2012)
  J.-W. Tsung, M. Havranek, F. Huegging, H. Kagan, H. Krueger and N. Wermes
  (See online at https://doi.org/10.1088/1748-0221/7/09/P09009)
• Topological Insulators in Magnetic Fields: Quantum Hall Effect and Edge Channels with a Nonquantized θ Term. Phys. Rev. Lett. 108, 126807 (2012)
  M. Sitte, A. Rosch, E. Altman, and L. Fritz
  (See online at https://doi.org/10.1103/PhysRevLett.108.126807)
• Contact Interactions Probe Effective Dark Matter Models at the LHC. Europhys. Lett. 102, 51001 (2013)
  H. Dreiner, D. Schmeier, J. Tattersall
  (See online at https://doi.org/10.1209/0295-5075/102/51001)
• Electric Quantum Walks with Individual Atoms. Phys. Rev. Lett. 110, 190601 (2013)
  M. Genske, W. Alt, A. Steffen, A.H. Werner, R.F. Werner, D. Meschede, and A. Alberti
  (See online at https://doi.org/10.1103/PhysRevLett.110.190601)
• Ion impacts on graphene/Ir (111): interface channeling, vacancy funnels, and a nanomesh. Nano Lett. 13 (5), 1948 (2013)
  S. Standop, O. Lehtinen, C. Herbig, G. Lewes-Malandrakis, F. Craes, J. Kotakoski, T. Michely, A.V. Krasheninnikov, C. Busse
  (See online at https://doi.org/10.1021/nl304659n)
• Mapping Image Potential States on Graphene Quantum Dots. Phys. Rev. Lett. 111, 056804 (2013)
  F. Craes, S. Runte, J. Klinkhammer, M. Kralj, T. Michely, and C. Busse
  (See online at https://doi.org/10.1103/PhysRevLett.111.056804)
• Refined stable pair invariants for E-, M- and [p,q]-strings. JHEP 2013, 112 (2013)
  M.-X. Huang, A. Klemm, M. Poretschkin
  (See online at https://doi.org/10.1007/JHEP01(2013)023)
• Shocks in dense clouds. IV. Effects of grain-grain processing on molecular line emission. A&A 556, A69 (2013)
  S. Anderl, V. Guillet, G. Pineau des Forêts and D.R. Flower
  (See online at https://doi.org/10.1051/0004-6361/201321399)
• Unwinding of a Skyrmion Lattice by Magnetic Monopoles. Science 340, 1076 (2013)
  P. Milde, D. Köhler, J. Seidel, L. M. Eng, A. Bauer, A. Chacon, J. Kindervater, S. Mühlbauer, C. Pfleiderer, S. Buhrandt, C. Schütte, A. Rosch
  (See online at https://doi.org/10.1126/science.1234657)
• η and η' mixing from Lattice QCD. Phys. Rev. Lett. 111, 181602 (2013)
  C. Michael, K. Ottnad, C. Urbach
  (See online at https://doi.org/10.1103/PhysRevLett.111.181602)
• Bacterial twitching motility is coordinated by a two-dimensional tug-of-war with directional memory. Nature Communication 5, 3759 (2014)
  R. Marathe, C. Meel, N.C. Schmidt, L. Dewenter, R. Kurre, L. Greune, M.A. Schmidt, M.J.I. Müller, R. Lipowsky, B. Maier, S. Klumpp
  (See online at https://doi.org/10.1038/ncomms4759)
• Bloch oscillations in plasmonic waveguide arrays. Nature Communication. 5, 3843 (2014)
  A. Block, C. Etrich, T. Limboeck, F. Bleckmann, E. Soergel, C. Rockstuhl, S. Linden
  (See online at https://doi.org/10.1038/ncomms4843)
• CheckMATE: Confronting your Favourite New Physics Model with LHC Data. Comput. Phys. Commun. 187, 227 (2014)
  M. Drees, H.K. Dreiner, J.-S. Kim, D. Schmeier, J. Tattersall
  (See online at https://doi.org/10.1016/j.cpc.2014.10.018)
• Constraining galaxy cluster temperatures and redshifts with eROSITA survey data. A&A 567, A65 (2014)
  K. Borm, T.H. Reiprich, I. Mohammed, L. Lovisari
  (See online at https://doi.org/10.1051/0004-6361/201322643)
• Observation of grand-canonical number statistics in a photon Bose-Einstein condensate. Phys. Rev. Lett. 112, 030401 (2014)
  J. Schmitt, T. Damm, D. Dung, F. Vewinger, J. Klaers, and M. Weitz
  (See online at https://doi.org/10.1103/PhysRevLett.112.030401)
• The gamma-ray spectrometer HORUS and its application for nuclear astrophysics. Nucl. Instr. Meth. A 754, 94 (2014)
  L. Netterdon, V. Derya, J. Endres, C. Fransen, A. Hennig, J. Mayer, C. Müller-Gatermann, A. Sauerwein, P. Scholz, M. Spieker, A. Zilges
  (See online at https://doi.org/10.1016/j.nima.2014.04.025)
• Vector chiral phases in frustrated 2D XY model and quantum spin chains. Phys. Rev. Lett. 112, 157201 (2014)
  H. Schenck, V.L. Pokrovsky and T. Nattermann
  (See online at https://doi.org/10.1103/PhysRevLett.112.157201)
• Cavity-Modified Collective Rayleigh Scattering of Two Atoms. Phys. Rev. Lett. 114, 023601 (2015)
  R. Reimann, W. Alt, T. Kampschulte, T. Macha, L. Ratschbacher, N. Thau, S. Yoon and D. Meschede
  (See online at https://doi.org/10.1103/PhysRevLett.114.023601)
• Ideal Negative Measurements in Quantum Walks Disprove Theories Based on Classical Trajectories. Phys. Rev. X 5, 011003 (2015)
  C. Robens, W. Alt, D. Meschede, C. Emary and A. Alberti
  (See online at https://doi.org/10.1103/PhysRevX.5.011003)
• Identification and energy calibration of hadronically decaying tau leptons with the ATLAS experiment in pp collisions at sqrt s=8 TeV. Eur. Phys. J. C 75, 303 (2015)
  ATLAS Collaboration, …, W. Davey, J. Dingfelder, F. Scutti, B. Winter , S. Yuen, et al.
  (See online at https://doi.org/10.1140/epjc/s10052-015-3500-z)
• Origin of Low-Lying Enhanced E1 Strength in Rare-Earth Nuclei. Phys. Rev. Lett. 114, 192504 (2015)
  M. Spieker, S. Pascu, A. Zilges, and F. Iachello
  (See online at https://doi.org/10.1103/PhysRevLett.114.192504)
• Summary of the ATLAS experiment's sensitivity to supersymmetry after LHC Run 1 - interpreted in the phenomenological MSSM. JHEP 10, 134 (2015)
  G. Aad, …, S. Schaepe, M. Schultens, O. Ricken, T. Nattermann, P. Bechtle, K. Desch et al. (on behalf of the ATLAS Collaboration)
  (See online at https://doi.org/10.1007/JHEP10(2015)134)
• Two-Loop Higgs mass calculations in supersymmetric models beyond the MSSM with SARAH and SPheno. Eur. Phys. J. C 75, 32 (2015)
  M.D. Goodsell, K. Nickel, F. Staub
  (See online at https://doi.org/10.1140/epjc/s10052-014-3247-y)
• A novel high-order, entropy stable, 3D AMR MHD solver with guaranteed positive pressure. J. Comp. Phys. 317, 223 (2016)
  D. Derigs, A.R. Winters, G.J. Gassner, S. Walch
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• All-sky census of Galactic high-latitude molecular intermediate-velocity clouds. A&A 596, A94 (2016)
  T. Röhser, J. Kerp, D. Lenz, B. Winkel
  (See online at https://doi.org/10.1051/0004-6361/201629141)
• Bott periodicity for Z2 symmetric ground states of gapped free-fermion systems R. Kennedy and M.R. Zirnbauer. Commun. Math. Phys. 342, 909 (2016)
  R. Kennedy and M.R. Zirnbauer
  (See online at https://doi.org/10.1007/s00220-015-2512-8)
• Calorimetry of a Bose-Einstein-condensed photon gas. Nature Communication 7, 11340 (2016)
  T. Damm, J. Schmitt, Q. Liang, D. Dung, F. Vewinger, M. Weitz, and J. Klaers
  (See online at https://doi.org/10.1038/ncomms11340)
• Collective Molecular Superrotation: A Model for Extremely Flexible Molecules Applied to Protonated Methane. Phys. Rev. Lett. 117, 223002 (2016)
  H. Schmiedt, P. Jensen, S. Schlemmer
  (See online at https://doi.org/10.1103/PhysRevLett.117.223002)
• Robustness of topologically protected edge states in quantum walk experiments with neutral atoms. Phys. Rev. A 94, 013620 (2016)
  T. Groh, S. Brakhane, W. Alt, D. Meschede, J. Asbóth and A. Alberti
  (See online at https://doi.org/10.1103/PhysRevA.%2094.013620)
• Thermodynamics versus Local Density Fluctuations in the Metal–Mott-Insulator Crossover. Phys. Rev. Lett. 117, 135301 (2016)
  J. H. Drewes, E. Cocchi, L. A. Miller, C.F. Chan, D. Pertot, F. Brennecke, and M. Köhl
  (See online at https://doi.org/10.1103/PhysRevLett.117.135301)
• A ferroelectric quantum phase transition inside the superconducting dome of Sr1-xCaxTiO3-δ. Nature Physics 13, 643 (2017)
  C. Rischau, X. Lin, C. Grams, D. Finck, S. Harms, J. Engelmayer, T. Lorenz, Y. Gallais, B. Fauqué, J. Hemberger, K. Behnia
  (See online at https://doi.org/10.1038/NPHYS4085)
• Classical Spin Spirals in Frustrated Magnets from Free-Fermion Band Topology. Phys. Rev. B 96, 085145 (2017)
  J. Attig and S. Trebst
  (See online at https://doi.org/10.1103/PhysRevB.96.085145)
• Entropy-limited topological protection of skyrmions. Science Advances 3, e1701704 (2017)
  J. Wild, T.N.G. Meier, S. Pöllath, M. Kronseder, A. Bauer, A. Chacon, M. Halder, M. Schowalter, A. Rosenauer, J. Zweck, J. Müller, A. Rosch, C. Pfleiderer, C.H. Back
  (See online at https://doi.org/10.1126/sciadv.1701704)
• First-order spatial coherence measurements in a thermalized two-dimensional photonic quantum gas. Nature Communication 8, 158 (2017)
  T. Damm, D. Dung, F. Vewinger, M. Weitz, and J. Schmitt
  (See online at https://doi.org/10.1038/s41467-017-00270-8)
• Jet reconstruction and performance using particle flow with the ATLAS Detector. Eur. Phys. J. C 77, 466 (2017)
  M. Aaboud, …, M. Hansen, P. Häfner et al. (on behalf of the ATLAS Collaboration)
  (See online at https://doi.org/10.1140/epjc/s10052-017-5031-2)
• Kondo destruction in RKKY-coupled Kondo lattice and multi-impurity systems. Phys. Rev. Lett. 118, 117204 (2017)
  A. Nejati, K. Ballmann, and J. Kroha
  (See online at https://doi.org/10.1103/PhysRevLett.118.117204)
• Length scale of puddle formation in compensation-doped semiconductors and topological insulators. Phys. Rev. B 96, 075204 (2017)
  T. Bömerich, J. Lux, Q.T. Feng, A. Rosch
  (See online at https://doi.org/10.1103/PhysRevB.96.075204)
• Millimeter and submillimeter wave spectroscopy of propanal. J. Mol. Spec. 342, 125 (2017)
  O. Zingsheim, H.S.P. Müller, F. Lewen, J.K. Jørgensen, S. Schlemmer
  (See online at https://doi.org/10.1016/j.jms.2017.07.008)
• Modelling clumpy photon-dominated regions in 3D - Understanding the Orion Bar stratification. A&A, 598, A2 (2017)
  S. Andree-Labsch, V. Ossenkopf-Okada and M. Röllig
  (See online at https://doi.org/10.1051/0004-6361/201424287)
• Probing the Bond Order Wave Phase Transitions of the Ionic Hubbard Model by Superlattice Modulation Spectroscopy. Phys. Rev. Lett. 119, 230403 (2017)
  K. Loida, J.-S. Bernier, R. Citro, E. Orignac, and C. Kollath
  (See online at https://doi.org/10.1103/PhysRevLett.119.230403)
• Variable potentials for thermalized light and coupled condensates. Nature Photonics 11, 565 (2017)
  D. Dung, C. Kurtscheid, T. Damm, J. Schmitt, F. Vewinger, M. Weitz, and J. Klaers
  (See online at https://doi.org/10.1038/NPHOTON.2017.139)
• ZOMG - III. The effect of halo assembly on the satellite population. MNRAS 473, 2234 (2017)
  E. Garaldi, E. Romano-Díaz, M. Borzyszkowski, C. Porciani
  (See online at https://doi.org/10.1093/mnras/stx2489)
• Distributed Star Formation throughout the Galactic Center Cloud Sgr B2. ApJ 853, 171 (2018)
  A. Ginsburg, …, F. Meng, and 25 other authors
  (See online at https://doi.org/10.3847/1538-4357/aaa6d4)
• Higgs mode in a strongly interacting fermionic superfluid. Nature Physics 14, 781 (2018)
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