Dr Gesa-Roxanne Siemann

Leverhulme Early Career Fellow

Researcher profile

Email

grs6@st-andrews.ac.uk

Selected publications

• Open access

  Clustering-enhanced time- and angle-resolved photoemission study of LaTe₃: absence of a photoinduced secondary charge density wave in the electronic structure

  Siemann, G.-R., Curcio, D., Mortensen, A. S., Sanders, C. E., Zhang, Y., Rigden, J., Majchrzak, P., Biswas, D., Springate, E., Singha, R., Schoop, L. M. & Hofmann, P., 15 Feb 2026, In: Physical Review B. 113, 7, 11 p., 075137.

  Research output: Contribution to journal › Article › peer-review

• Open access

  Dichotomy of electron-phonon interactions in the delafossite PdCoO₂: from weak bulk to polaronic surface coupling

  Siemann, G.-R., Murgatroyd, P. A. E., Antonelli, T., Morales, E. A., Khim, S., Rosner, H., Watson, M. D., Mackenzie, A. P. & King, P. D. C., 15 Aug 2025, In: Physical Review B. 112, 8, 11 p., 085113.

  Research output: Contribution to journal › Article › peer-review

• Open access

  Avoided metallicity in a hole-doped Mott insulator on a triangular lattice

  Yim, C. M., Siemann, G.-R., Stavrić, S., Khim, S., Benedičič, I., Murgatroyd, P. A. E., Antonelli, T., Watson, M. D., Mackenzie, A. P., Picozzi, S., King, P. D. C. & Wahl, P., 16 Sept 2024, In: Nature Communications. 15, 8 p., 8098 .

  Research output: Contribution to journal › Article › peer-review

• Open access

  Chemical trends of the bulk and surface termination-dependent electronic structure of metal-intercalated transition metal dichalcogenides

  Edwards, B. M., Deaconu, D., Murgatroyd, P., Buchberger, S., Antonelli, T., Halliday, D. R., Siemann, G.-R., Zivanovic, A., Trzaska, L., Rajan, A., Abarca Morales, E., Mayoh, D., Hall, A., Belosludov, R., Watson, M. D., Kim, T., Biswas, D., Lee, T., Polley, C. & Carbone, D. & 4 others, Leandersson, M., Balakrishnan, G., Bahramy, M. & King, P., 13 Aug 2024, In: Chemistry of Materials. 36, 15, p. 7117-7126 10 p.

  Research output: Contribution to journal › Article › peer-review

• Open access

  Controlling the charge density wave transition in single-layer TiTe_2xSe_2(1−x) alloys by band gap engineering

  Antonelli, T., Rajan, A., Watson, M. D., Soltani, S., Houghton, J., Siemann, G.-R., Zivanovic, A., Bigi, C., Edwards, B. M. & King, P., 10 Jan 2024, In: Nano Letters. 24, 1, p. 215-221 7 p., 3c03776.

  Research output: Contribution to journal › Letter › peer-review

• Open access

  Spin-orbit coupling induced Van Hove singularity in proximity to a Lifshitz transition in Sr₄Ru₃O₁₀

  de Almeida Marques, C., Murgatroyd, P., Fittipaldi, R., Osmolska, W., Edwards, B. M., Benedicic, I., Siemann, G.-R., Rhodes, L. C., Buchberger, S., Naritsuka, M., Abarca Morales, E., Halliday, D. R., Polley, C., Leandersson, M., Horio, M., Chang, J., Arumugam, R., Lettieri, M., Granata, V. & Vecchione, A. & 2 others, King, P. & Wahl, P., 8 Apr 2024, In: npj Quantum Materials. 9, 40 p., 35.

  Research output: Contribution to journal › Article › peer-review

• Open access

  Covalency, correlations, and interlayer interactions governing the magnetic and electronic structure of Mn₃Si₂Te₆

  Bigi, C., Qiao, L., Liu, C., Barone, P., Hatnean, M. C., Siemann, G.-R., Achinuq, B., Mayoh, D. A., Vinai, G., Polewczyk, V., Dagur, D., Mazzola, F., Bencok, P., Hesjedal, T., van der Laan, G., Ren, W., Balakrishnan, G., Picozzi, S. & King, P. D. C., 11 Aug 2023, In: Physical Review. B, Condensed matter and materials physics. 108, 5, 10 p., 054419.

  Research output: Contribution to journal › Article › peer-review

• Open access

  Giant valley-Zeeman coupling in the surface layer of an intercalated transition metal dichalcogenide

  Edwards, B., Dowinton, O., Hall, A., Murgatroyd, P., Buchberger, S., Antonelli, T., Siemann, G.-R., Rajan, A., Abarca Morales, E., Zivanovic, A., Bigi, C., Belosludov, R., Polley, M., Carbone, D., Mayoh, D., Balakrishnan, G., Bahramy, M. & King, P., 1 Apr 2023, In: Nature Materials. 22, 4, p. 459-465 7 p.

  Research output: Contribution to journal › Article › peer-review

• Open access

  Hierarchy of Lifshitz transitions in the surface electronic structure of Sr₂RuO₄ under uniaxial compression

  Abarca Morales, E., Siemann, G.-R., Zivanovic, A., Murgatroyd, P., Markovic, I., Edwards, B., Hooley, C., Sokolov, D., Kikugawa, N., Cacho, C., Watson, M., Kim, T., Hicks, C. W., Mackenzie, A. & King, P., 3 Mar 2023, In: Physical Review Letters. 130, 9, 7 p., 096401.

  Research output: Contribution to journal › Article › peer-review

• Open access

  Spin-orbit coupled spin-polarised hole gas at the CrSe₂-terminated surface of AgCrSe₂

  Siemann, G.-R., Kim, S.-J., Abarca Morales, E., Murgatroyd, P., Zivanovic, A., Edwards, B. M., Markovic, I., Mazzola, F., Trzaska, L., Clark, O. J., Bigi, C., Zhang, H., Achinuq, B., Hesjedal, T., Watson, M. D., Kim, T. K., Bencok, P., van der Laan, G., Polley, C. M. & Leandersson, M. & 7 others, Fedderwitz, H., Ali, K., Thiagarajan, B., Schmidt, M., Baenitz, M., Rosner, H. & King, P., 21 Oct 2023, In: npj Quantum Materials. 8, 7 p., 61.

  Research output: Contribution to journal › Article › peer-review

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