Dr Roland Gillen

Senior Lecturer in Engineering (Trans-National Education)

Electronic and Electrical Engineering

roland.gillen@swansea.ac.uk

Office - 204
Second Floor
Engineering North
Bay Campus

Available For Postgraduate Supervision

Research Links

https://orcid.org/0000-0002-7913-0953

Google Scholar

Scopus

About

Dr Roland Gillen received his PhD (EEE) from the University of Cambridge and a MEng equivalent degree in Engineering Science from the Technical University Berlin, Germany.

He is interested in the electronic, optical and vibrational properties of semiconductor materials and their applicability for energy-efficient electronic devices. To this end, modern theoretical spectroscopy methods are used for computational characterization, complementing experimental investigations in the context of various collaborations.

A particular research focus lies on novel one- and two-dimensional nanomaterials and on functional heterostructures between semiconductor materials.

Areas Of Expertise

Density Functional Theory
Many-body perturbation theory
Low-dimensional nanomaterials
Semiconductor heterostructures
Excitonic materials

Publications

Research Highlights

Liu, K., Zheng, W., Osella, S., Qiu, Z., Böckmann, S., Niu, W., Meingast, L., Komber, H., Obermann, S., Gillen, R., Bonn, M., Hansen, M., Maultzsch, J., Wang, H., Ma, J., & Feng, X. (2024). Cove-Edged Chiral Graphene Nanoribbons with Chirality-Dependent Bandgap and Carrier Mobility. Journal of the American Chemical Society, 146(1), 1026-1034.
https://doi.org/10.1021/jacs.3c11975, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66641
Gillen, R. & Maultzsch, J. (2024). Family behavior and Dirac bands in armchair nanoribbons with 4–8 defect lines. Journal of Physics: Condensed Matter, 36(29), 295501
https://doi.org/10.1088/1361-648x/ad3b5a, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66642
Zhao, S., Huang, X., Gillen, R., Li, Z., Liu, S., Watanabe, K., Taniguchi, T., Maultzsch, J., Hone, J., Högele, A., Baimuratov, A., & Gillen, R. (2024). Hybrid Moiré Excitons and Trions in Twisted MoTe₂–MoSe₂ Heterobilayers. Nano Letters, 24(16)
https://doi.org/10.1021/acs.nanolett.4c00541, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66643
http://dx.doi.org/10.1021/acs.nanolett.4c00541
Wolff, S., Gillen, R., & Maultzsch, J. (2023). Electronic Properties and Interlayer Interactions in Antimony Oxide Homo‐ and Heterobilayers. physica status solidi (b), 260(12)
https://doi.org/10.1002/pssb.202300376, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66644
Kamutzki, F., Bekheet, M., Selve, S., Kampmann, F., Siemensmeyer, K., Kober, D., Gillen, R., Wagner, M., Maultzsch, J., Gurlo, A., & Hanaor, D. (2023). NaGdSi2O6 – A novel antiferromagnetically coupled silicate with Vierer chain structure. Journal of Solid State Chemistry, 317, 123677
https://doi.org/10.1016/j.jssc.2022.123677, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66645
Li, L., Gillen, R., Palummo, M., Milošević, M., & Peeters, F. (2023). Strain tunable interlayer and intralayer excitons in vertically stacked MoSe2/WSe2 heterobilayers. Applied Physics Letters, 123(3)
https://doi.org/10.1063/5.0147761, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66646
Janzen, B., Gillen, R., Galazka, Z., Maultzsch, J., & Wagner, M. (2022). First- and second-order Raman spectroscopy of monoclinic 𝛽−Ga2⁢O3. Physical Review Materials, 6(5)
https://doi.org/10.1103/physrevmaterials.6.054601, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66647
Badlyan, N., Pettinger, N., Enderlein, N., Gillen, R., Chen, X., Zhang, W., Knirsch, K., Hirsch, A., & Maultzsch, J. (2022). Oxidation and phase transition in covalently functionalized MoS2. Physical Review B, 106(10)
https://doi.org/10.1103/physrevb.106.104103, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66649
Khestanova, E., Ivanova, T., Gillen, R., D’Elia, A., Lacey, O., Wysocki, L., Grüneis, A., Kravtsov, V., Strupinski, W., Maultzsch, J., Kandyba, V., Cattelan, M., Barinov, A., Avila, J., Dudin, P., & Senkovskiy, B. (2023). Robustness of Momentum-Indirect Interlayer Excitons in MoS2/WSe2 Heterostructure against Charge Carrier Doping. ACS Photonics, 10(4)
https://doi.org/10.1021/acsphotonics.2c01930, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66650
Janzen, B., Mazzolini, P., Gillen, R., Peltason, V., Grote, L., Maultzsch, J., Fornari, R., Bierwagen, O., & Wagner, M. (2021). Comprehensive Raman study of orthorhombic κ/ε-Ga2O3 and the impact of rotational domains. Journal of Materials Chemistry C, 9(40), 14175-14189.
https://doi.org/10.1039/d1tc03500b, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66651

All Research

Journal Articles

Gillen, R. & Maultzsch, J. (2024). Family behavior and Dirac bands in armchair nanoribbons with 4–8 defect lines. Journal of Physics: Condensed Matter, 36(29), 295501
https://doi.org/10.1088/1361-648x/ad3b5a, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66642
Zhao, S., Huang, X., Gillen, R., Li, Z., Liu, S., Watanabe, K., Taniguchi, T., Maultzsch, J., Hone, J., Högele, A., Baimuratov, A., & Gillen, R. (2024). Hybrid Moiré Excitons and Trions in Twisted MoTe₂–MoSe₂ Heterobilayers. Nano Letters, 24(16)
https://doi.org/10.1021/acs.nanolett.4c00541, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66643
http://dx.doi.org/10.1021/acs.nanolett.4c00541
Liu, K., Zheng, W., Osella, S., Qiu, Z., Böckmann, S., Niu, W., Meingast, L., Komber, H., Obermann, S., Gillen, R., Bonn, M., Hansen, M., Maultzsch, J., Wang, H., Ma, J., & Feng, X. (2024). Cove-Edged Chiral Graphene Nanoribbons with Chirality-Dependent Bandgap and Carrier Mobility. Journal of the American Chemical Society, 146(1), 1026-1034.
https://doi.org/10.1021/jacs.3c11975, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66641
Wolff, S., Gillen, R., & Maultzsch, J. (2023). Electronic Properties and Interlayer Interactions in Antimony Oxide Homo‐ and Heterobilayers. physica status solidi (b), 260(12)
https://doi.org/10.1002/pssb.202300376, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66644
Li, L., Gillen, R., Palummo, M., Milošević, M., & Peeters, F. (2023). Strain tunable interlayer and intralayer excitons in vertically stacked MoSe2/WSe2 heterobilayers. Applied Physics Letters, 123(3)
https://doi.org/10.1063/5.0147761, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66646
Khestanova, E., Ivanova, T., Gillen, R., D’Elia, A., Lacey, O., Wysocki, L., Grüneis, A., Kravtsov, V., Strupinski, W., Maultzsch, J., Kandyba, V., Cattelan, M., Barinov, A., Avila, J., Dudin, P., & Senkovskiy, B. (2023). Robustness of Momentum-Indirect Interlayer Excitons in MoS2/WSe2 Heterostructure against Charge Carrier Doping. ACS Photonics, 10(4)
https://doi.org/10.1021/acsphotonics.2c01930, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66650
Kamutzki, F., Bekheet, M., Selve, S., Kampmann, F., Siemensmeyer, K., Kober, D., Gillen, R., Wagner, M., Maultzsch, J., Gurlo, A., & Hanaor, D. (2023). NaGdSi2O6 – A novel antiferromagnetically coupled silicate with Vierer chain structure. Journal of Solid State Chemistry, 317, 123677
https://doi.org/10.1016/j.jssc.2022.123677, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66645
Badlyan, N., Pettinger, N., Enderlein, N., Gillen, R., Chen, X., Zhang, W., Knirsch, K., Hirsch, A., & Maultzsch, J. (2022). Oxidation and phase transition in covalently functionalized MoS2. Physical Review B, 106(10)
https://doi.org/10.1103/physrevb.106.104103, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66649
Janzen, B., Gillen, R., Galazka, Z., Maultzsch, J., & Wagner, M. (2022). First- and second-order Raman spectroscopy of monoclinic 𝛽−Ga2⁢O3. Physical Review Materials, 6(5)
https://doi.org/10.1103/physrevmaterials.6.054601, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66647
Erkensten, D., Brem, S., Wagner, K., Gillen, R., Perea-Causín, R., Ziegler, J., Taniguchi, T., Watanabe, K., Maultzsch, J., Chernikov, A., & Malic, E. (2021). Dark exciton-exciton annihilation in monolayer WSe2. Physical Review B, 104(24)
https://doi.org/10.1103/physrevb.104.l241406, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66653
Janzen, B., Mazzolini, P., Gillen, R., Peltason, V., Grote, L., Maultzsch, J., Fornari, R., Bierwagen, O., & Wagner, M. (2021). Comprehensive Raman study of orthorhombic κ/ε-Ga2O3 and the impact of rotational domains. Journal of Materials Chemistry C, 9(40), 14175-14189.
https://doi.org/10.1039/d1tc03500b, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66651
Gillen, R. (2021). Interlayer Excitonic Spectra of Vertically Stacked MoSe2/WSe2 Heterobilayers. physica status solidi (b), 258(7)
https://doi.org/10.1002/pssb.202000614, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66654
Chen, X., Bartlam, C., Lloret, V., Badlyan, N., Wolff, S., Gillen, R., Stimpel‐Lindner, T., Maultzsch, J., Duesberg, G., Knirsch, K., & Hirsch, A. (2021). Covalent Bisfunctionalization of Two‐Dimensional Molybdenum Disulfide. Angewandte Chemie International Edition, 60(24), 13484-13492.
https://doi.org/10.1002/anie.202103353, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66652
Kampmann, F., Panchakarla, L., Gillen, R., Tenne, R., & Maultzsch, J. (2021). Vibrational Properties and Charge Transfer in the Misfit-Layer Compound LaS–CrS2. The Journal of Physical Chemistry C, 125(14), 8006-8013.
https://doi.org/10.1021/acs.jpcc.1c02187, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66656
Janzen, B., Mazzolini, P., Gillen, R., Falkenstein, A., Martin, M., Tornatzky, H., Maultzsch, J., Bierwagen, O., & Wagner, M. (2021). Isotopic study of Raman active phonon modes in β-Ga2O3. Journal of Materials Chemistry C, 9(7), 2311-2320.
https://doi.org/10.1039/d0tc04101g, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66655
Brem, S., Lin, K., Gillen, R., Bauer, J., Maultzsch, J., Lupton, J., & Malic, E. (2020). Hybridized intervalley moiré excitons and flat bands in twisted WSe2 bilayers. Nanoscale, 12(20), 11088-11094.
https://doi.org/10.1039/d0nr02160a, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66659
Merkl, P., Mooshammer, F., Brem, S., Girnghuber, A., Lin, K., Weigl, L., Liebich, M., Yong, C., Gillen, R., Maultzsch, J., Lupton, J., Malic, E., & Huber, R. (2020). Twist-tailoring Coulomb correlations in van der Waals homobilayers. Nature Communications, 11(1)
https://doi.org/10.1038/s41467-020-16069-z, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66661
Assebban, M., Gibaja, C., Fickert, M., Torres, I., Weinreich, E., Wolff, S., Gillen, R., Maultzsch, J., Varela, M., Rong, S., Loh, K., Michel, E., Zamora, F., & Abellán, G. (2020). Unveiling the oxidation behavior of liquid-phase exfoliated antimony nanosheets. 2D Materials, 7(2), 025039
https://doi.org/10.1088/2053-1583/ab755e, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66663
Wolff, S., Gillen, R., Assebban, M., Abellán, G., & Maultzsch, J. (2020). Two-Dimensional Antimony Oxide. Physical Review Letters, 124(12)
https://doi.org/10.1103/physrevlett.124.126101, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66662
Tyborski, C., Hückstaedt, T., Gillen, R., Otto, T., Fokina, N., Fokin, A., Schreiner, P., & Maultzsch, J. (2020). Vibrational signatures of diamondoid dimers with large intramolecular London dispersion interactions. Carbon, 157, 201-207.
https://doi.org/10.1016/j.carbon.2019.10.014, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66664
Karni, O., Barré, E., Lau, S., Gillen, R., Ma, E., Kim, B., Watanabe, K., Taniguchi, T., Maultzsch, J., Barmak, K., Page, R., & Heinz, T. (2019). Infrared Interlayer Exciton Emission in MoS2/WSe2 Heterostructures. Physical Review Letters, 123(24)
https://doi.org/10.1103/physrevlett.123.247402, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66665
Tornatzky, H., Gillen, R., Uchiyama, H., & Maultzsch, J. (2019). Phonon dispersion in MoS2. Physical Review B, 99(14)
https://doi.org/10.1103/physrevb.99.144309, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66666
Li, H., Xu, X., Zhang, Y., Gillen, R., Shi, L., & Robertson, J. (2018). Native point defects of semiconducting layered Bi2O2Se. Scientific Reports, 8(1)
https://doi.org/10.1038/s41598-018-29385-8, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66668
Gillen, R. & Maultzsch, J. (2018). Interlayer excitons in MoSe2/WSe2 heterostructures from first principles. Physical Review B, 97(16)
https://doi.org/10.1103/physrevb.97.165306, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66667
Tyborski, C., Gillen, R., Fokin, A., Koso, T., Fokina, N., Hausmann, H., Rodionov, V., Schreiner, P., Thomsen, C., & Maultzsch, J. (2017). Electronic and Vibrational Properties of Diamondoid Oligomers. The Journal of Physical Chemistry C, 121(48), 27082-27088.
https://doi.org/10.1021/acs.jpcc.7b07666, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66669
Tyborski, C., Meinke, R., Gillen, R., Bischoff, T., Knecht, A., Richter, R., Merli, A., Fokin, A., Koso, T., Rodionov, V., Schreiner, P., Möller, T., Rander, T., Thomsen, C., & Maultzsch, J. (2017). From isolated diamondoids to a van-der-Waals crystal: A theoretical and experimental analysis of a trishomocubane and a diamantane dimer in the gas and solid phase. The Journal of Chemical Physics, 147(4)
https://doi.org/10.1063/1.4994898, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66670
Abellán, G., Wild, S., Lloret, V., Scheuschner, N., Gillen, R., Mundloch, U., Maultzsch, J., Varela, M., Hauke, F., & Hirsch, A. (2017). Fundamental Insights into the Degradation and Stabilization of Thin Layer Black Phosphorus. Journal of the American Chemical Society, 139(30), 10432-10440.
https://doi.org/10.1021/jacs.7b04971, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66671
Gillen, R. & Maultzsch, J. (2016). Light-Matter Interactions in Two-Dimensional Transition Metal Dichalcogenides: Dominant Excitonic Transitions in Mono- and Few-Layer MoX$_2$ and Band Nesting. IEEE Journal of Selected Topics in Quantum Electronics, 23(1), 219-230.
https://doi.org/10.1109/jstqe.2016.2604359, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66672
Gibaja, C., Rodriguez‐San‐Miguel, D., Ares, P., Gómez‐Herrero, J., Varela, M., Gillen, R., Maultzsch, J., Hauke, F., Hirsch, A., Abellán, G., & Zamora, F. (2016). Few‐Layer Antimonene by Liquid‐Phase Exfoliation. Angewandte Chemie International Edition, 55(46), 14345-14349.
https://doi.org/10.1002/anie.201605298, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66673
Staiger, M., Bačić, V., Gillen, R., Radovsky, G., Gartsman, K., Tenne, R., Heine, T., Maultzsch, J., & Thomsen, C. (2016). Raman spectroscopy of intercalated and misfit layer nanotubes. Physical Review B, 94(3)
https://doi.org/10.1103/physrevb.94.035430, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66674
Li, H., Gillen, R., & Robertson, J. (2016). The screening effects of the screened exchange hybrid functional in surface systems: A case study on the CO/Pt(111) problem. AIP Advances, 6(6)
https://doi.org/10.1063/1.4954032, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66676

Conference Contributions

Mooshammer, F., Merkl, P., Ovesen, S., Brem, S., Girnghuber, A., Lin, K., Liebich, M., Yong, C., Gillen, R., Maultzsch, J., Lupton, J., Malic, E., & Huber, R. (2021). Twist-Tailoring Hybrid Excitons In Van Der Waals Homobilayers. In 2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)IEEE.
https://doi.org/10.1109/cleo/europe-eqec52157.2021.9542072, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66657
Mooshammer, F., Merkl, P., Ovesen, S., Brem, S., Girnghuber, A., Lin, K., Liebich, M., Yong, C., Gillen, R., Maultzsch, J., Lupton, J., Malic, E., & Huber, R. (2020). Excitons in twisted van der Waals bilayers: Internal structure and ultrafast dynamics. In 2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)IEEE.
https://doi.org/10.1109/irmmw-thz46771.2020.9370984, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66658
Karni, O., Barre, E., Lau, S., Gillen, R., Ma, E., Gal, L., Yaffe, T., Kim, B., Watanabe, K., Taniguchi, T., Orenstein, M., Maultzsch, J., Barmak, K., Page, R., & Heinz, T. (2020). Tunable infrared light emission from MoS2/WSe2 heterostructures. In Conference on Lasers and Electro-OpticsOptica Publishing Group.
https://doi.org/10.1364/cleo_si.2020.sm1q.1, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa66660

Key Grants and Projects

Strong interlayer interactions in two-dimensional pnictogen-based homo- and heterobilayers 2024

Project in Priority Programme 2244 of the German Research Foundation (DFG), 185.000€
Interfaces and heterostructures of quasi-two-dimensional semiconductors 2013 - 2014

Internal start-up funding of the Technical University Berlin, 44.000€

Career History

Lecturer, Department of Physics, Friedrich-Alexander University Erlangen, Germany

July 2022 - February 2024
Research Associate, Department of Physics, Friedrich-Alexander University Erlangen, Germany

July 2017 - June 2022
Research Associate, Institute of Solid State Physics, Technical University Berlin, Germany

July 2013 - June 2017
PhD student, Department of Engineering, University of Cambridge

October 2009 - July 2013

Dr Roland Gillen

Email address

Research Links

About

Areas Of Expertise

Publications

Research Highlights

All Research

Journal Articles

Conference Contributions

Key Grants and Projects

Strong interlayer interactions in two-dimensional pnictogen-based homo- and heterobilayers 2024

Interfaces and heterostructures of quasi-two-dimensional semiconductors 2013 - 2014

Career History

Lecturer, Department of Physics, Friedrich-Alexander University Erlangen, Germany

Research Associate, Department of Physics, Friedrich-Alexander University Erlangen, Germany

Research Associate, Institute of Solid State Physics, Technical University Berlin, Germany

PhD student, Department of Engineering, University of Cambridge