Hofmann, Phillip

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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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.

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.

Ágústsson, S. Ý., Jones, A. J. H., Curcio, D., Ulstrup, S., Miwa, J., Mottin, D., Karras, P. & Hofmann, P. (2024). Autonomous micro-focus angle-resolved photoemission spectroscopy. Review of Scientific Instruments, 95(5), Article 055106. https://doi.org/10.1063/5.0204663

Ágústsson, S. Ý., Haque, M. A., Truong, T. T., Bianchi, M., Klyuchnikov, N., Mottin, D., Karras, P. & Hofmann, P. (2025). An autoencoder for compressing angle-resolved photoemission spectroscopy data. Machine Learning: Science and Technology, 6(1), Article 015019. https://doi.org/10.1088/2632-2153/ada8f2

Akhound, M. A., Boland, T. M., Sauer, M. O., Batzill, M., Abraham, B. M., Canulescu, S., Gogotsi, Y., Hofmann, P., Kis, A., Lu, J., Michely, T., Raza, S., Ren, W., Robinson, J. A., Sofer, Z., Teng, J., Ulstrup, S., Zhao, M., Zhao, X. ... Thygesen, K. S. (2026). Large-Scale Integration of Experimental and Computational Data for 2D Materials. ACS Nano, 20(15), 12008-12022. https://doi.org/10.1021/acsnano.6c01514

Andreatta, F., Rostami, H., Čabo, A. G., Bianchi, M., Sanders, C. E., Biswas, D., Cacho, C., Jones, A. J. H., Chapman, R. T., Springate, E., King, P. D. C., Miwa, J. A., Balatsky, A., Ulstrup, S. & Hofmann, P. (2019). Transient hot electron dynamics in single-layer TaS₂. Physical Review B, 99(16), Article 165421. https://doi.org/10.1103/PhysRevB.99.165421

Aretz, J., Grytsiuk, S., Liu, X., Feraco, G., Knekna, C., Waseem, M., Dan, Z., Bianchi, M., Hofmann, P., Ali, M. N., Katsnelson, M. I., Grubišić-Čabo, A., Strand, H. U. R., Van Loon, E. G. C. P. & Rösner, M. (2025). From Strong to Weak Correlations in Breathing-Mode Kagome van der Waals Materials: Nb₃(F, Cl, Br, I)₈ as a Robust and Versatile Platform for Many-Body Engineering. Physical Review X, 15(4), Article 041042. https://doi.org/10.1103/wr7w-nfhg

Arnold, F., Warmuth, J., Michiardi, M., Fikacek, J., Bianchi, M., Hu, J., Mao, Z., Miwa, J., Singh, U. R., Bremholm, M., Wiesendanger, R., Honolka, J., Wehling, T., Wiebe, J. & Hofmann, P. (2018). Electronic structure of Fe_1.08Te bulk crystals and epitaxial FeTe thin films on Bi₂Te₃. Journal of Physics: Condensed Matter, 30(6), Article 065502. https://doi.org/10.1088/1361-648X/aaa43e

Arnold, F., Stan, R.-M., Mahatha, S. K., Lund, H. E., Curcio, D., Dendzik, M., Bana, H., Travaglia, E., Bignardi, L., Lacovig, P., Lizzit, D., Li, Z., Bianchi, M., Miwa, J. A., Bremholm, M., Lizzit, S., Hofmann, P. & Sanders, C. E. (2018). Novel single-layer vanadium sulphide phases. 2D materials, 5(4), Article 045009. https://doi.org/10.1088/2053-1583/aad0c8

Bahramy, M. S., King, P. D. C., de la Torre, A., Chang, J., Shi, M., Patthey, L., Balakrishnan, G., Hofmann, P., Arita, R., Nagaosa, N. & Baumberger, F. (2012). Emergent quantum confinement at topological insulator surfaces. Nature Communications, 3(1159), 1-7. https://doi.org/10.1038/ncomms2162

Balatsky, A. V., Haraldsen, J. T., Black-Schaffer, A. M., Pertsova, A. & Hofmann, P. (2020). Dynamic quantum matter. Annalen der Physik, 532(2), Article 2000037. https://doi.org/10.1002/andp.202000037

Balog, R., Jørgensen, B., Wells, J., Lægsgaard, E., Hofmann, P., Besenbacher, F. & Hornekær, L. (2009). Atomic hydrogen adsorbate structures on graphene. Journal of the American Chemical Society, 131(25), 8744. https://doi.org/10.1021/ja902714h

Balog, R., Jørgensen, B., Nilsson, L., Andersen, M., Rienks, E., Bianchi, M., Fanetti, M., Lægsgaard, E., Baraldi, A., Lizzit, S., Sljivancanin, Z., Besenbacher, F., Hammer, B., Pedersen, T. G., Hofmann, P. & Hornekær, L. (2010). Bandgap opening in graphene induced by patterned hydrogen adsorption. Nature Materials, 9, 315-319. https://doi.org/10.1038/NMAT2710

Balog, R., Andersen, M., Jørgensen, B., Sljivancanin, Z., Hammer, B., Baraldi, A., Larciprete, R., Hofmann, P., Hornekær, L. & Lizzit, S. (2013). Controlling Hydrogenation of Graphene on Ir(111). A C S Nano, 7(5), 3823–3832. https://doi.org/10.1021/nn400780x

Bana, H., Travaglia, E., Bignardi, L., Lacovig, P., Sanders, C. E., Dendzik, M., Michiardi, M., Bianchi, M., Lizzit, D., Presel, F., De Angelis, D., Apostol, N., Das, P. K., Fujii, J., Vobornik, I., Larciprete, R., Baraldi, A., Hofmann, P. & Lizzit, S. (2018). Epitaxial growth of single-orientation high-quality MoS2 monolayers. 2D materials, 5(3), Article 035012. https://doi.org/10.1088/2053-1583/aabb74

Baraldi, A., Lizzit, K., Hofmann, P. & De Gironcoli, S. (2003). Multilayer thermal expansion of Be(0001) determined from surface core level shifts. Europhysics Letters, 64(3), 364-370.

Barreto, L., Perkins, E., Johannsen, J., Ulstrup, S., Fromm, F., Raidel, C., Seyller, T. & Hofmann, P. (2013). Detecting the local transport properties and the dimensionality of transport of epitaxial graphene by a multi-point probe approach. Applied Physics Letters, 102(3). https://doi.org/10.1063/1.4789508

Barreto, L., Bianchi, M., Guan, D., Hatch, R., Mi, J., Iversen, B. B. & Hofmann, P. (2013). Electron–phonon coupling in the two-dimensional electron gas on Bi₂Se₃. Physica Status Solidi. Rapid Research Letters, 7(1-2), 136-138. https://doi.org/10.1002/pssr.201206407

Barreto, L., Kühnemund, L., Edler, F., Tegenkamp, C., Mi, J., Bremholm, M., Brummerstedt Iversen, B., Frydendahl, C., Bianchi, M. & Hofmann, P. (2014). Surface-Dominated Transport on a Bulk Topological Insulator. Nano Letters, 14(7), 3755-3760. https://doi.org/10.1021/nl501489m

Benter, S., Bianchi, M., Pan, D., Zhao, J., Xu, H. Q., Timm, R., Hofmann, P. & Mikkelsen, A. (2024). 2D electron gas formation on InAs wurtzite nanosheet surfaces. Applied Physics Letters, 124(15), Article 153104. https://doi.org/10.1063/5.0200217

Berti, A., D'Alessio, M., Bianchi, M., Bignardi, L., Lacovig, P., Sanders, C., Lizzit, S., Hofmann, P., Marrazzo, A. & Baraldi, A. (2024). Unraveling oxygen-driven surface segregation dynamics in platinum-gold alloys. Applied Surface Science, 670, Article 160577. https://doi.org/10.1016/j.apsusc.2024.160577

Beyer, H., Rohde, G., Grubišić Čabo, A., Stange, A., Jacobsen, T., Bignardi, L., Lizzit, D., Lacovig, P., Sanders, C. E., Lizzit, S., Rossnagel, K., Hofmann, P. & Bauer, M. (2019). 80% Valley Polarization of Free Carriers in Singly Oriented Single-Layer WS2 on Au(111). Physical Review Letters, 123(23), Article 236802. https://doi.org/10.1103/PhysRevLett.123.236802

Bianchi, M., Rienks, E., Lizzit, S., Baraldi, A., Balog, R., Hornekær, L. & Hofmann, P. (2010). Electron-phonon coupling in potassium-doped graphene: Angle-resolved photoemission spectroscopy. Physical Review B, 81(4), 041403. https://doi.org/10.1103/PhysRevB.81.041403

Bianchi, M., Guan, D., Bao, S., Mi, J., Iversen, B. B., King, P. D. C. & Hofmann, P. (2010). Coexistence of the topological state and a two-dimensional electron gas on the surface of Bi₂Se₃. Nature Communications, 1(8), 128. https://doi.org/10.1038/ncomms1131

Bianchi, M., Hatch, R. C., Hofmann, P., Mi, J. & Iversen, B. B. (2011). Simultaneous Quantization of Bulk Conduction and Valence States through Adsorption of Nonmagnetic Impurities on Bi₂Se₃. Physical Review Letters, 107(8), 086802-1 - 086802-4. https://doi.org/10.1103/PhysRevLett.107.086802

Bianchi, M., Hatch, R., Li, Z., Hofmann, P., Song, F., Mi, J., Iversen, B. B., El-Fattah, Z. M. A., Löptien, P., Zhou, L., Khajetoorians, A. A., Weibe, J., Wiesendanger, R. & Wells, J. W. (2012). Robust Surface Doping of Bi₂Se₃ by Rubidium Intercalation. A C S Nano, 6(8), 7009-7015. https://doi.org/10.1021/nn3021822

Bianchi, M., Hatch, R., Guan, D., Planke, T., Mi, J., Iversen, B. B. & Hofmann, P. (2012). The electronic structure of clean and adsorbate-covered Bi2Se3: an angle-resolved photoemission study. Semiconductor Science and Technology, 27. https://doi.org/10.1088/0268-1242/27/12/124001

Bianchi, M., Guan, D., Strózecka, A., Haldan Voetmann, C., Bao, S., Pascual, J. I., Eiguren, A. & Hofmann, P. (2012). Surface states on a topologically nontrivial semimetal: The case of Sb(110). Physical Review B, 85, 155431. https://doi.org/10.1103/PhysRevB.85.155431

Bianchi, M., Song, F., Cooil, S., Monsen, A. F., Wahlstrom, E., Miwa, J. A., Rienks, E. D. L., Evans, D. A., Strozecka, A., Pascual, J. I., Leandersson, M., Balasubramanian, T., Hofmann, P. & Wells, J. W. (2015). One-dimensional spin texture of Bi(441): Quantum spin Hall properties without a topological insulator. Physical Review B, 91(16), Article 165307. https://doi.org/10.1103/PhysRevB.91.165307

Bianchi, M., Hofmann, P., Hoffmann, S. V., Jones, N. C., Li, Z., Miwa, J., Møller, S. P., Nielsen, J. S., Thomsen, H. D., Ulstrup, S. & Worm, T. (2023). Status and strategy at ISA, centre for storage ring facilities, Aarhus University, Denmark. European Physical Journal Plus, 138(2), Article 132. https://doi.org/10.1140/epjp/s13360-023-03748-1

Bianchi, M., Acharya, S., Dirnberger, F., Klein, J., Pashov, D., Mosina, K., Sofer, Z., Rudenko, A. N., Katsnelson, M. I., Van Schilfgaarde, M., Rösner, M. & Hofmann, P. (2023). Paramagnetic electronic structure of CrSBr: Comparison between ab initio GW theory and angle-resolved photoemission spectroscopy. Physical Review B, 107(23), Article 235107. https://doi.org/10.1103/PhysRevB.107.235107

Bianchi, M., Hsieh, K., Porat, E. J., Dirnberger, F., Klein, J., Mosina, K., Sofer, Z., Rudenko, A. N., Katsnelson, M. I., Chen, Y. P., Rösner, M. & Hofmann, P. (2023). Charge transfer induced Lifshitz transition and magnetic symmetry breaking in ultrathin CrSBr crystals. Physical Review B, 108(19), Article 195410. https://doi.org/10.1103/PhysRevB.108.195410

Bignardi, L., Lizzit, D., Bana, H., Travaglia, E., Lacovig, P., Sanders, C. E., Dendzik, M., Michiardi, M., Bianchi, M., Ewert, M., Buß, L., Falta, J., Flege, J. I., Baraldi, A., Larciprete, R., Hofmann, P. & Lizzit, S. (2019). Growth and structure of singly oriented single-layer tungsten disulfide on Au(111). Physical Review Materials, 3(1), Article 014003. https://doi.org/10.1103/PhysRevMaterials.3.014003

Bignardi, L., Mahatha, S. K., Lizzit, D., Bana, H., Travaglia, E., Lacovig, P., Sanders, C., Baraldi, A., Hofmann, P. & Lizzit, S. (2021). Anisotropic strain in epitaxial single-layer molybdenum disulfide on Ag(110). Nanoscale, 13(44), 18789-18798. https://doi.org/10.1039/d1nr05584d

Biswas, D., Jones, A., Majchrzak, P. E., Choi, B. K., Lee, T. H., Volckaert, K., feng, J., Markovic, I., Andreatta, F., Kang, C.-J., kim, H. J., Lee, I. H., Joswiak, C., Rotenberg, E., Bostwick, A., Sanders, C., Zhang, Y., Karras, G., Chapman, R. T. ... Ulstrup, S. (2021). Ultrafast triggering of insulator-metal transition in two-dimensional VSe₂. Nano Letters, 21(5), 1968-1975. https://doi.org/10.1021/acs.nanolett.0c04409

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 Bi₂Sr₂CaCu₂O_8+δ. Physica C, 417, 1-6. http://www.sciencedirect.com

Borisenko, S., Fedorov, A., Kuibarov, A., Bianchi, M., Bezguba, V., Majchrzak, P., Hofmann, P., Baumgärtel, P., Voroshnin, V., Kushnirenko, Y., Sánchez-Barriga, J., Varykhalov, A., Ovsyannikov, R., Morozov, I., Aswartham, S., Feia, O., Harnagea, L., Wurmehl, S., Kordyuk, A. ... Büchner, B. (2022). Fermi surface tomography. Nature Communications, 13(1), Article 4132. https://doi.org/10.1038/s41467-022-31841-z

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.

Bruix, A., Miwa, J., Hauptmann, N., Wegner, D., Ulstrup, S., Grønborg, S. S., Sanders, C., Dendzik, M., Grubisic Cabo, A., Bianchi, M., Lauritsen, J. V., Khajetoorians, A. A., Hammer, B. & Hofmann, P. (2016). Single-layer MoS2 on Au(111): Band gap renormalization and substrate interaction. Physical Review B, 93(16), Article 165422. https://doi.org/10.1103/PhysRevB.93.165422

Cabo, A. G., Miwa, J. A., Sørensen, S. G., Riley, J. M., Johannsen, J. C., Cacho, C., Alexander, O., Chapman, R. T., Springate, E., Grioni, M., Lauritsen, J. V., King, P. D. C., Hofmann, P. & Ulstrup, S. (2015). Observation of Ultrafast Free Carrier Dynamics in Single Layer MoS₂. Nano Letters, 15(9), 5883-5887. https://doi.org/10.1021/acs.nanolett.5b01967

Chien, T. Y., Rienks, E., Jensen, M. F., Hofmann, P. & Plummer, E. W. (2009). Anisotropic electron-phonon coupling on a two-dimensional circular Fermi contour. Physical Review B, 80, 241416. https://doi.org/10.1103/PhysRevB.80.241416

Chikina, A., Bhattacharyya, G., Curcio, D., Sanders, C. E., Bianchi, M., Lanatà, N., Watson, M., Cacho, C., Bremholm, M. & Hofmann, P. (2022). One-dimensional electronic states in a natural misfit structure. Physical Review Materials, 6(9), 1-5. Article L092001. https://doi.org/10.1103/PhysRevMaterials.6.L092001

Chikina, A., Lund, H., Bianchi, M., Curcio, D., Dalgaard, K. J., Bremholm, M., Lei, S., Singha, R., Schoop, L. M. & Hofmann, P. (2023). Charge density wave generated Fermi surfaces in NdTe3. Physical Review B, 107(16), Article L161103. https://doi.org/10.1103/PhysRevB.107.L161103

Christian Johannsen, J., Ulstrup, S., Bianchi, M., Hatch, R., Guan, D., Mazzola, F., Hornekær, L., Fromm, F., Raidel, C., Seyller, T. & Hofmann, P. (2013). Electron-phonon coupling in quasi free-standing graphene. Journal of Physics: Condensed Matter, 25, 094001. https://doi.org/10.1088/0953-8984/25/9/094001

Curcio, D., Jones, A., Muzzio, R., Volckaert, K. C. R., Biswas, D., Sanders, C. E., Dudin, P., Cacho, C., Singh, S., Watanabe, K., Taniguchi, T., Miwa, J., Katoch, J., Ulstrup, S. & Hofmann, P. (2020). Accessing the Spectral Function in a Current-Carrying Device. Physical Review Letters, 125(23), Article 236403. https://doi.org/10.1103/PhysRevLett.125.236403

Curcio, D., Pakdel, S., Volckaert, K., Miwa, J. A., Ulstrup, S., Lanatà, N., Bianchi, M., Kutnyakhov, D., Pressacco, F., Brenner, G., Dziarzhytski, S., Redlin, H., Agustsson, S. Y., Medjanik, K., Vasilyev, D., Elmers, H. J., Schönhense, G., Tusche, C., Chen, Y. J. ... Hofmann, P. (2021). Ultrafast electronic linewidth broadening in the C 1s core level of graphene. Physical Review B, 104(16), Article L161104. https://doi.org/10.1103/PhysRevB.104.L161104

Curcio, D., Volckaert, K., Kutnyakhov, D., Agustsson, S. Y., Bühlmann, K., Pressacco, F., Heber, M., Dziarzhytski, S., Acremann, Y., Demsar, J., Wurth, W., Sanders, C. E. & Hofmann, P. (2022). Tracking the surface atomic motion in a coherent phonon oscillation. Physical Review B, 106(20), Article L201409. https://doi.org/10.1103/PhysRevB.106.L201409

Curcio, D., Sanders, C. E., Chikina, A., Lund, H. E., Bianchi, M., Granata, V., Cannavacciuolo, M., Cuono, G., Autieri, C., Forte, F., Avallone, G., Romano, A., Cuoco, M., Dudin, P., Avila, J., Polley, C., Balasubramanian, T., Fittipaldi, R., Vecchione, A. & Hofmann, P. (2023). Current-driven insulator-to-metal transition without Mott breakdown in Ca2RuO4. Physical Review B, 108(16), Article L161105. https://doi.org/10.1103/PhysRevB.108.L161105

Datzer, C., Zumbuelte, A., Braun, J., Foerster, T., Schmidt, A. B., Mi, J., Iversen, B. B., Hofmann, P., Minar, J., Ebert, H., Krueger, P., Rohlfing, M. & Donath, M. (2017). Unraveling the spin structure of unoccupied states in Bi2Se3. Physical Review B, 95(11), Article 115401. https://doi.org/10.1103/PhysRevB.95.115401

Dendzik, M., Michiardi, M., Sanders, C., Bianchi, M., Miwa, J. A., Grønborg, S. S., Lauritsen, J. V., Bruix, A., Hammer, B. & Hofmann, P. (2015). Growth and electronic structure of epitaxial single-layer WS₂ on Au(111). Physical Review B, 92(24), Article 245442. https://doi.org/10.1103/PhysRevB.92.245442

Displaying results 1 to 50 out of 252

Revised 08.12.2025

Lise Refstrup Linnebjerg Pedersen