Interdisciplinary Nanoscience Center

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 iNANO Research Senior scientists E-J Hofmann, Philip

Hofmann, Phillip

Philip Hofmann

Professor
M
H 1520, 323
P +4587155612
P +4587155612

Keywords

  • Electronic structure

  • Angle-resolved photoemission spectroscopy

  • Synchrotron radiation

  •  Ultrafast electron dynamics

Head of Phillips Hofmann's research group

Professor Philip Hofmann
 

Electronic properties and electron dynamics in quantum materials

Our group is using powerful analytical tools (synchrotron radiation-based photoelectron spectroscopy, time-resolved photoelectron spectroscopy, nano-scale transport measurements and scanning tunnelling microscopy) to study the electronic properties and electron dynamics in quantum materials. We are mostly working with the surfaces of semimetals, topological insulators and with novel two-dimensional materials such as graphene or single-layer transition metal dichalcogenides.

Recent publications

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Briner, B. G., Hofmann, P., Doering, M., Rust, H.-P., Bradshaw, A. M., Petersen, L., Lægsgaard, E., Besenbacher, F. & Plummer, E. W. (1997). Looking at electronic wave functions on metal surfaces. Europhysics News, 28, 148.
Petersen, L., Sprunger, P. T., Hofmann, P., Lægsgaard, E., Briner, B. G., Doering, M., Rust, H.-P., Bradshaw, A. M., Besenbacher, F. & Plummer, E. W. (1998). Direct imaging of the 2-D Fermi contour: Fourier transform STM. Phys. Rev. B Rapid Communication, 57, R 6858.
Hofmann, P., Søndergaard, C. S., Schultz, C., Moreno, S., Gayone, J. P., Vicente Alvarez, M. A., Zampieri, G., Lizzit, S. & Baraldi, A. (2001). Abstract.
Nielsen, L. P., Schønning, M., Christensen, S. V., Hoffmann, S. V., Li, Z., Hofmann, P., Besenbacher, F. & Clausen, B. S. (2001). Combined TPS, XPS, EXAFS and NO-TPD study of the sulfiding of Mo/Al 2O 3. Catalysis Letters, 73, 85-90.
Søndergaard, C. S., Hofmann, P., Schultz, C., Moreno, S., Gayone, J. P., Vicente Alvarez, M. A., Zampieri, G., Lizzit, S. & Baraldi, A. (2001). Final state effects on photoemission line shapes at finite temperature. Physical Review E, B 63, 233102-233105.
Stahrenberg, K., Herrmann, T., Esser, N., Richter, W. & Hofmann, P. (2001). Optical properties of the Au(110) surface. Physical Review E, B 65, 354071-354076.
Søndergaard, C. S., Hofmann, P., Schultz, C., Hoffmann, S. V., Moreno, S., Gayone, J. P., Vicente Alvarez, M. A., Zampieri, G., Lizzit, S. & Baraldi, A. (2001). Temperature-dependent photoemission on Al(001). Paper presented at Polen.
Agergaard, S., Søndergaard, C. S., Li, H., Nielsen, M. B., Hoffmann, S. V., Li, Z. & Hofmann, P. (2001). The effect of reduced dimensionality on a semimetal: the electronic structure of the Bi(110) surface. New Journal of Physics, 3, 15.
Søndergaard, C. S., Li, S., Agergaard, H., Li, Z., Hoffmann, S. V., Hofmann, P., Grütter, C. & Bilgram, J. H. (2001). The electronic structure and the surface phase transition on α -Ga(010). Paper presented at The electronic structure and the surface phase transition on α -Ga(010), Poland.
Agergaard, S., Søndergaard, C. S., Li, H., Nielsen, M. B., Li, Z., Hoffmann, S. V. & Hofmann, P. (2001). The surface electronic structure of Bi(110). Paper presented at The surface electronic structure of Bi(110), Poland.
More, S., Soares, E., van Hove, M. A., Lizzit, S., Baraldi, A. & Hofmann, P. (2002). alpha-Ga(001) surface phase transition and reconstruction:a LEED analysis of the (1x1) room temperature and c(4x2)low temperature structures. (pp. 046403-1).
More, S., Soares, E., nullHove, V., M.A., Lizzit, S., Baraldi, A. & Hofmann, P. (2002). A two-dimensional metal to semiconductor surface phase transition: a LEED investigation of the Ga(001) surface reconstruction. (pp. 046403-1).
Stahrenberg, K., Herrmann, T., Esser, N., Richter, W., Hoffmann, S. V. & Hofmann, P. (2002). Optical properties of the Au(110) surface. Physical Review B, 65, 35407.
Hofmann, P., Baddorf, A. P. & Plummer, E. W. (2002). Positive and negative thermal expansion at a metal surface. Paper presented at Indiana Convention Center, Indianapolis, Indiana, United States.
More, S., Soares, E., van Hove, M. A., Lizzit, S., Baraldi, A., Hofmann, P., Gruetter, C. & Bilgram, J. H. (2002). Structural determination of the alpha-Ga(001) by Low Energy Electron Diffraction: phase transition and evidence of large thermal vibrations. (pp. 046403-1).
Ismail, Hofmann, P., Baddorf, A. P. & Plummer, E. W. (2002). Thermal expansion at a metal surface: A study of Mg(0001) and Be(1010). Physical Review B, 66(24).
Hofmann, P., Søndergaard, C. S., Agergaard, S., Hoffmann, S. V., Gayone, J. E., Zampieri, G., Lizzit, S. & Baraldi, A. (2002). Unexpected surface sensitivity at high energies in angle-resolved photoemission. Physical Review B, 66, 165406-1.
Moosburger-Will, J., Klemm, M., Hofmann, P. & Horn, S. (2003). Atomic scale imaging and electronic structure of the MoO2. Paper presented at Fruehjahrstagung der Deutschen Physikalischen Gesellschaft, Dresden, Germany.
Nielsen, M. B., Li, Z., Lizzit, S., Goldoni, A. & Hofmann, P. (2003). Bulk Fermi surface mapping with high-energy angle-resolved photoemission. Journal of Physics: Cond. Matt., 15, 6919-6930.
Hofmann, P., Gayone, J. E., Hoffmann, S. V. & Li, Z. (2003). Electronic Structure and Electron-Phonon Interaction on Bi(100). Paper presented at Fruehjahrstagung der Deutschen Physikalischen Gesellschaft, Dresden, Germany.
Søndergaard, C. S., Schultz, C., Agergaard, S., Li, H., Li, Z., Hoffmann, S. V., Grütter, C., Bilgram, J. H. & Hofmann, P. (2003). Electronic Structure of α-Ga. Physical Review B, 67.
Søndergaard, C. S., Schultz, C., Agergaard, S., Hoffmann, S. V., Li, Z., Hofmann, P., Li, H., Grütter, C. & Bilgram, J. H. (2003). Interplay between electronic structure and phase transition on α-Ga(010). Physical Review B, 67(16), 165422-1.
Baraldi, A., Lizzit, K., Hofmann, P. & De Gironcoli, S. (2003). Multilayer thermal expansion of Be(0001) determined from surface core level shifts. EPL, 64(3), 364-370.
Gayone, J. E., Hoffmann, S. V., Li, Z. & Hofmann, P. (2003). Strong Energy Dependence of the Electron-Phonon Coupling Strength on Bi(100). Physical Review Letters, 91(12), 127601.
Hofmann, P., Søndergaard, C. S., Agergaard, S., Hoffmann, S. V., Gayone, J. E., Zampieri, G., Lizzit, S. & Baraldi, A. (2003). Unexpected surface sensitivity at high energies in angle-resolved photoemission. Physical Review B, 66.
More, S., Soares, E. A., Van Hove, M. A., Lizzit, S., Baraldi, A., Grütter, C., Bilgram, J. H. & Hofmann, P. (2003). α-Ga(010) surface reconstruction: A LEED structural analysis of the (1x1) room temperature and (2√2×√2) R45∙ low-temperature structures. Physical Review B, 68, 075414-1.
Hoffmann, S. V., Søndergaard, C. S., Schultz, C., Li, Z. & Hofmann, P. (2004). An undulator-based spherical grating monochromator beamline for angle-resolved photoemission spectroscopy. Nucl. Instr. Meth., A 523, 441.
Borisenko, S. V., Kim, T. K., Kordyuk, A. A., Knupfer, M., Fink, J., Gayone, J. E., Hofmann, P., Berger, H., Liang, B., Maljuk, A. & Lin, C. T. (2004). Exitation energy dependence of the ARPES intensity in Pb-doped and pristine Bi2Sr2CaCu2O8+δ. Physica C, 417, 1-6. http://www.sciencedirect.com
Herrmann, T., Gensch, M., Lee, M. J. G., Shkrebtii, A. I., Esser, N., Richter, W. & Hofmann, P. (2004). Optical reflectance anisotropy of A1(110): Experiment and ab initio calculation. Physical Review E, B69, 165406-1.
Pohl, K., Plummer, E. W., Hoffmann, S. V. & Hofmann, P. (2004). Phase diagram of hydrogen on Be(0001) from reconstruction-induced surface core-level shifts. Physical Review B, 70, 235424.
Pascual, J. I., Bihlmayer, G., Koroteev, Y. M., Rust, H.-P., Ceballos, G., Hansmann, M., Horn, K., Chulkov, E. V., Blugel, S., Echenique, P. M. & Hofmann, P. (2004). Role of Spin in Quasiparticle Interference. Physical Review Letters, 93(19), 196802-1.
Koroteev, Y. M., Bihlmayer, G., Gayone, J. E., Chulkov, E. V., Blügel, S., Echenique, P. M. & Hofmann, P. (2004). Strong Spin-Orbit Splitting on Bi Surfaces. Physical Review Letters, 93(4), 046403-1.
Goldoni, A., Petaccia, L., Zampieri, G., Lizzit, S., Cepek, C., Gayone, E., Wells, J. & Hofmann, P. (2005). Band-like dispersion in the valence band photoemission spectra of K6C60 (110) films. Paper presented at XIX International Winterschool/Euroconference on Electronic Properties of Novel Materials, 5. marts 2005, Kirchberg, Tyrol, Østrig.
Hofmann, P., Zampieri, G., Petaccia, L., Lizzit, S. & Baraldi, A. (2005). Comment on "Momentum-Dependent Energy Losses in Core Level Photoemission Spectra of Poorly Conducting Metals" Physical Review Letters, 94.
Gayone, J. E., Kirkegaard, J. E., Wells, J., Hoffmann, S. V., Li, Z. & Hofmann, P. (2005). Determining the electron-phonon mass enhancement parameter λ on metal surfaces. Appl. Phys. A, 80, 943-949.
Hofmann, P., Gayone, J. E., Bihlmayer, G., Koroteev, Y. M. & Chulkov, E. V. (2005). Electronic structure and Fermi surface of Bi(100). Physical Review B, 71.
Kim, T. K., Sørensen, T. S., Wolfring, E., Li, H., Chulkov, E. V. & Hofmann, P. (2005). Electron-phonon coupling on the Mg(0001) surface. Physical Review B, 72.
Kim, T. K., Wells, J., Kirkegaard, C., Li, Z., Hoffmann, S. V., Gayone, J. E., Fernandez-Torrente, I., Häberle, P., Pascual, J. I., Moore, K. T., Schwartz, A. J., He, H., Spence, J. C. H., Downing, K. H., Lazar, S., Tichelaar, F. D., Borisenko, S. V., Knupfer, M. & Hofmann, P. (2005). Evidence against a charge density wave on Bi(111). Physical Review B, 72.
Zampieri, G., Lizzit, S., Pettacia, L., Goldoni, A., Baraldi, A., Bremholm, M., Gayone, J. E., Hoffmann, S. V. & Hofmann, P. (2005). Photoelectron diffraction study of the 6H-SiC (0001) √3X√3 R30° reconstruction. Physical Review B, 72, 165327.
Kirkegaard, C., Kim, T. K. . & Hofmann, P. (2005). Self-energy determination and electron-phonon coupling on Bi(110). New Journal of Physics, 7(99), 165406-1.
Mönig, H., Sun, J., Koroteev, Y. M., Bihlmayer, G., Wells, J., Chulkov, E. V., Pohl, K. & Hofmann, P. (2005). Structure of the (111) surface of bismuth: LEED analysis and first-principles calculations. Physical Review B, 72.
Lee, M. J. G., Gensch, M., Shkrebtii, A. I., Herrmann, T., Richter, W., Esser, N. & Hofmann, P. (2005). Surface states and resonances on Al(110): Ultraviolet photoemission spectroscopy and ab initio calculations. Physical Review B, 72.
Wells, J., Kallehauge, J. F., Hansen, T. M. & Hofmann, P. (2006). Disentangling Surface, Bulk, and Space-Charge-Layer Conductivity in Si (111) - (7 x 7). Physical Review Letters, 97, 206803.
Goldoni, A., Petaccia, L., Zampieri, G., Lizzit, S., Cepek, C., Gayone, E., Wells, J. & Hofmann, P. (2006). Evidence for bandlike dispersion in K6C60(110) films. Phys. Rev. Lett. B, 74, 045414.
Sun, J., Mikkelsen, A., Jensen, M. F., Koroteev, Y. M., Bihlmayer, G., Chulkow, E. V., Adams, D. L., Hofmann, P. & Pohl, K. (2006). Structural determination of the Bi(110) semimetal surfaceby LEED analysis and ab initio calculations. Physical Review B, 74, 245406.
Hofmann, P. (2006). The surfaces of bismuth: Structuraland electronic properties. Progress in Surface Science 81, 191-245.
Lizzit, S., Petaccia, L., Goldoni, A., Larciprete, R., Hofmann, P. & Zampieri, G. (2007). C 1s photoemission spectrum in graphite(0001). Physical Review B, 76, 153408.
Diaconescu, B., Pohl, K., Vattuone, L., Savio, L., Hofmann, P., Silkin, V. M., Pitarke, J. M., Chulkov, E. V., Echenique, P. M., Farias, D. & Rocca, M. (2007). Low-energy acoustic plasmons at metal surfaces. Nature, 448, 57.
Jensen, M. F., Timur, K., Bengió, S., Sklyadneva, I. Y., Leonardo, A., Eremeev, S. V., Chulkov, S. V. & Hofmann, P. (2007). Thermally induced defects and the lifetime of electronic surface states. Physical Review B, 75, 153404.
Wells, J., Kallehauge, J. & Hofmann, P. (2007). Thermal switching of the electrical conductivity of Si(111)(√3 × √3)Ag due to a surface phase transition. J. Phys..: Condens. Matter, 19, 176008.

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Revised 08.12.2025
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Lise Refstrup Linnebjerg Pedersen