Overview of project B09
THz Dynamics of Photo-Excited Charge Carriers on the µm Scale
The goal of this project is the investigation of non-equilibrium charge carrier dynamics in two-dimensional electron gases in different material systems: plasmonic graphene structures, black phosphorus, and oxide heterostructures will allow excitation by various stimuli, e.g. interband or plasmon excitation, and optical phonons driven by THz fields. THz pulses will be utilized to probe the carrier redistribution and relaxation with picosecond temporal and micrometer spatial resolution. The combined results will help to understand the different scattering processes after excitation.
Publications
2025
Pavlo Sai, Vadym V. Korotyeyev, Dmytro B. But, Maksym Dub, Dmitriy Yavorskiy, Jerzy Łusakowski, Mateusz Słowikowski, Serhii Kukhtaruk, Yurii Liashchuk, Jeong-Woo Han, Christoph Böttger, Alexej Pashkin, Stephan Winnerl, Wojciech Knap and Martin Mittendorff
Extreme Terahertz Nonlinearity of AlGaN/GaN‐Based Grating‐Gate Plasmonic Crystals
Adv. Opt. Mater. 2500716 (2025)
DOI: 10.1002/adom.202500716
Negin Beryani Nezafat, Ahana Bhattacharya, Sepideh Izadi, Inga Ennen, Martin Wortmann, Lauritz Schnatmann, Shahram Solaymani, Sławomir Kulesza, Miroslaw Bramowicz, Michael Westphal, Jan Biedinger, Karsten Rott, Michael Dittler, Andreas Hütten, Günter Reiss, Martin Mittendorff and Gabi Schierning
Dephasing Mechanisms of Topologically Protected 2D Surface Carriers in Sputtered SnTe Thin Films
Nano Lett. 25, 11811 (2025)
DOI: 10.1021/acs.nanolett.5c01902
Ahana Bhattacharya, Andri Darmawan, Jeong-Woo Han, Frederik Steinkamp, Nicholas S. Bingham, Ryan J. Suess, Stephan Winnerl, Markus Gruner, Eric N. Jin, Frederick J. Walker, Charles H. Ahn, Rossitza Pentcheva and Martin Mittendorff
Terahertz Carrier Dynamics in SrTi3/LaTiO3 Interfacial Two-Dimensional Electron Gases
Phys. Rev. B 112, 155307 (2025)
DOI: 10.1103/g23p-b4m5
2024
Hüseyin Azazoglu, Philip Kapitza, Martin Mittendorff, Rolf Möller and Manuel Gruber
Variable-Temperature Lightwave-Driven Scanning Tunneling Microscope With a Compact, Turn-Key Terahertz Source
Rev. Sci. Instrum. 95, 023703 (2024)
DOI: 10.1063/5.0165719
2023
Sepideh Izadi, Ahana Bhattacharya, Sarah Salloum, Jeong-Woo Han, Lauritz Schnatmann, Ulrike Wolff, Nicolas Perez, Georg Bendt, Inga Ennen, Andreas Hütten, Kornelius Nielsch, Stephan Schulz, Martin Mittendorff and Gabi Schierning
Density-Dependence of Surface Transport in Tellurium-Enriched Nanograined Bulk Bi2Te3
Small 19, 2204850 (2023)
DOI: 10.1002/smll.202204850
Jeong-Woo Han, Pavlo Sai, Dmytro B. But, Ece Uykur, Stephan Winnerl, Gagan Kumar, Matthew L. Chin, Rachael L. Myers-Ward, Matthew T. Dejarld, Kevin M. Daniels, Thomas E. Murphy, Wojciech Knap and Martin Mittendorff
Strong Transient Magnetic Fields Induced by THz-Driven Plasmons in Graphene Disks
Nat. Commun. 14, 7493 (2023)
DOI: 10.1038/s41467-023-43412-x
2022
Alexander Kunzmann, Jan Frenzel, Ulrike Wolff, Jeong-Woo Han, Lars Giebeler, David Piorunek, Martin Mittendorff, Juliane Scheiter, Heiko Reith, Nicolas Perez, Kornelius Nielsch, Gunther Eggeler and Gabi Schierning
The Role of Electrons During the Martensitic Phase Transformation in NiTi-Based Shape Memory Alloys
Materials Today Physics 100671 (2022)
DOI: 10.1016/j.mtphys.2022.100671
2021
Matthew L. Chin, Sebastian Matschy, Florian Stawitzki, Jayaprakash Poojali, Hassan A. Hafez, Dmitry Turchinovich, Stephan Winnerl, Gagan Kumar, Rachael L. Myers-Ward, Matthew T. Dejarld, Kevin M. Daniels, H Dennis Drew, Thomas E. Murphy and Martin Mittendorff
Observation of Strong Magneto Plasmonic Nonlinearity in Bilayer Graphene Discs
J. Phys. Photonics 3, 01LT01 (2021)
DOI: 10.1088/2515-7647/abd7d0
Sepideh Izadi, Jeong Woo Han, Sarah Salloum, Ulrike Wolff, Lauritz Schnatmann, Aswin Vijai Asaithambi, Sebastian Matschy, Heike Schlörb, Heiko Reith, Nicolas Perez, Kornelius Nielsch, Stephan Schulz, Martin Mittendorff and Gabi Schierning
Interface‐Dominated Topological Transport in Nanograined Bulk Bi2Te3
Small 2021, 2103281 (2021)
DOI: 10.1002/smll.202103281
Jeong Woo Han, Matthew L. Chin, Sebastian Matschy, Jayaprakash Poojali, Angelika Seidl, Stephan Winnerl, Hassan A. Hafez, Dmitry Turchinovich, Gagan Kumar, Rachael L. Myers-Ward, Matthew T. Dejarld, Kevin M. Daniels, Howard Dennis Drew, Thomas E. Murphy and Martin Mittendorff
Plasmonic Terahertz Nonlinearity in Graphene Disks
Adv. Photonics Res. 3, 2100218 (2021)
DOI: 10.1002/adpr.202100218
2020
Martin Mittendorff, Stephan Winnerl and Thomas E. Murphy
2D THz Optoelectronics
Adv. Optical Mater. 9, 2001500 (2009)
DOI: 10.1002/adom.202001500