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Mathematisch-Naturwissenschaftliche FakultätII. Physikalisches Institut Fachgruppe Physik

Subgroup Mashkovich

We specialize in cutting-edge terahertz spectroscopy of quantum materials, investigating phenomena in antiferromagnetic systems, altermagnets, superconductors, and non-Fermi liquids. Our expertise lies in high-field terahertz techniques, unlocking the complex interactions and excitations shaping these materials. Join us in advancing the understanding of quantum science!

Group Composition

Dr. Evgeny A. Mashkovich, Group leader

https://scholar.google.ru/citations?user=pfB2En8AAAAJ&hl=ru

https://orcid.org/0000-0002-0825-1408

Dr. Chris Reinhoffer, Postdoc

https://scholar.google.de/citations?user=FN4js18AAAAJ&hl=de

https://orcid.org/0009-0002-8625-8629

Semen Germanskiy, PhD student

https://orcid.org/0000-0002-5649-2548

Tushar Baruah, PhD student

 

 

Experimental techniques

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Two-dimensional terahertz spectroscopy  (2D-THz) is an advanced experimental technique used to investigate ultrafast processes and interactions in materials at terahertz (THz) frequencies, which lie between the microwave and infrared regions of the electromagnetic spectrum. Unlike linear THz spectroscopy, 2D-THz spectroscopy explores nonlinear responses of materials to intense THz fields, revealing information about interactions between excitations, such as phonons, magnons, or charge carriers. See details in Rev. Sci. Instrum. 94, 073005 (2023).

10T Magnet High-Field Terahertz Spectroscopy is an advanced experimental technique used to study the dynamic properties of matter under the influence of strong static magnetic fields and high-field strength terahertz pulses. This system is designed to make complex, facility-based experiments—typically conducted in large, specialized research environments—available in a more compact and accessible tabletop format

 

Group publications

  • S. Germanskiy, C. Reinhoffer, S. Kovalev, J.-C. Deinert, N. Awari, M. Bawatna, Min Chen, I. Ilyakov, T. de Oliviera, A. Ponomaryov, Y. Yang, F. Xiu, C. Zhu, P. Pilch, A. Reinold, E.A. Mashkovich and P.H.M. van Loosdrecht. Terahertz Second Harmonic Generation with Film Thickness Gradient in Cd3As2 (submitted).
  • C. Reinhoffer, I. Razdolski, P. Stein, S. Germanskiy, A. Stupakiewicz, P.H.M. van Loosdrecht, and E.A. Mashkovich. THz Control of Exchange Mode in a Ferrimagnetic Cavity. arXiv:2406.19849 (2024).
  • T.W.J. Metzger, K.A. Grishunin, C. Reinhoffer, R. M. Dubrovin, A. Arshad, I. Ilyakov, T. V. A. G. Oliveira, A. Ponomaryov, J.-C. Deinert, S. Kovalev, R. V. Pisarev, M. I. Katsnelson, B. A. Ivanov, P. H. M. van Loosdrecht, A. V. Kimel, and E.A. Mashkovich. Terahertz magnetism of rutile antiferromagnets. Proc. SPIE 13119, Spintronics XVII, 131190B (2024).
  • T.W.J. Metzger, K.A. Grishunin, C. Reinhoffer, R.M. Dubrovin, A. Arshad, I. Ilyakov, T.V.A.G. de Oliveira, A. Ponomaryov, J.-C. Deinert, S. Kovalev, R.V. Pisarev, M.I. Katsnelson, B.A. Ivanov, P.H.M. van Loosdrecht, A.V. Kimel, and E.A. Mashkovich. Magnon-phonon Fermi resonance in antiferromagnetic CoF2. Nat. Comm. 15 (1), 5472 (2024).
  • R.M. Dubrovin, A. Tellez-Mora, A.C. Garcia-Castro, N.V. Siverin, N.N. Novikova, K.N. Boldyrev, E.A. Mashkovich, A.H. Romero, and R.V. Pisarev. Polar phonons and magnetic excitations in the antiferromagnet CoF2, Phys. Rev. B 109, 224312 (2024).
  • C. Reinhoffer, S. Esser, S. Esser, E.A. Mashkovich, S. Germanskiy, P. Gegenwart, F. Anders, P.H. M. van Loosdrecht, and Zhe Wang. Strong Terahertz Third-Harmonic Generation by Kinetic Heavy Quasiparticles in CaRuO3. Phys. Rev. Lett. 132, 196501 (2024).
  • K.A. Grishunin, V.R. Bilyk, E.D. Mishina, A.V. Kimel and E.A. Mashkovich. Two-dimensional terahertz spectroscopy as a tool for revealing nonlinear interactions in media. Rev. Sci. Instrum. 94, 073005 (2023).
  • T.G.H. Blank, E.A. Mashkovich, K.A. Grishunin, C.F. Schippers, M.V. Logunov, B. Koopmans, A.K. Zvezdin, and A.V. Kimel. Effective rectification of THz electromagnetic fields in a ferrimagnetic iron garnet. Phys. Rev. B 108, 094439 (2023).
  • T.G.H. Blank, K.A. Grishunin, B.A. Ivanov, E.A. Mashkovich, D. Afanasiev, and A.V. Kimel. Empowering Control of Antiferromagnets by THz-induced Spin Coherence. Phys. Rev. Lett. 131, 096701 (2022).
  • T.W.J. Metzger, K.A. Grishunin, D. Afanasiev, R.M. Dubrovin, E.A. Mashkovich, R.V. Pisarev, and A.V. Kimel. Effect of antiferromagnetic order on a propagating single-cycle THz pulse. Appl. Phys. Lett. 121, 252403 (2022).
  • C. Reinhoffer, P. Pilch, A. Reinold, P. Derendorf, S. Kovalev, J.-C. Deinert, I. Ilyakov, A. Ponomaryov, Min Chen, Tie-Quan Xu, Yue Wang, Zi-Zhao Gan, De-Sheng Wu, Jian-Lin Luo, S. Germanskiy, E.A. Mashkovich, P.H.M. van Loosdrecht, I.M. Eremin, and Zhe Wang. High-order nonlinear terahertz probing of the two-band superconductor: Third- and fifth-order harmonic generation. Phys. Rev. B 106, 214514 (2022).
  • E.A. Mashkovich, K.A. Grishunin, A.K. Zvezdin, T.G.H. Blank, A.G. Zavyalov, P.H.M. van Loosdrecht, A.M. Kalashnikova, and A.V. Kimel. Terahertz-driven magnetization dynamics of bismuth-substituted yttrium iron-gallium garnet thin film near a compensation point. Phys. Rev. B 106, 18425 (2022).
  • S. Germanskiy, R.M.A. Dantas, S. Kovalev, C. Reinhoffer, E.A. Mashkovich, P.H.M. van Loosdrecht, Y. Yang, F. Xiu, P. Surówka, R. Moessner, T. Oka, and Zhe Wang. Ellipticity control of terahertz high-harmonic generation in a Dirac semimetal. Phys. Rev. B 106, L081127 (2022).
  • L. Cheng, F. Formisano, K.A. Grishunin, S.D. Gorelov, P.H.M. van Loosdrecht, J. Yan, X. Luo, Z. Sheng, and E.A. Mashkovich. Nonlinear terahertz Kerr effect in quasi-2D MnPS3. Optics Letters 47, 4052-4055 (2022).
  • A.I. Shugurov, S.B. Bodrov, E.A. Mashkovich, H. Kitahara, N.A. Abramovsky, M. Tani, and M.I. Bakunov. Noncollinear electro-optic sampling detection of terahertz pulses in a LiNbO3 crystal while avoiding the effect of intrinsic birefringence. Optics Express 30, 3741-3748 (2022).
  • E.A. Mashkovich, K.A. Grishunin, R.M. Dubrovin, A.K. Zvezdin, R.V. Pisarev, and A.V. Kimel. Terahertz light–driven coupling of antiferromagnetic spins to lattice. Science 374, 1608-1611 (2021).
  • K.A. Grishunin, E.A. Mashkovich, A.V. Kimel, A.M. Balbashov, and A.K. Zvezdin. Excitation and Detection of THz Coherent Spin Waves in Antiferromagnetic a-Fe2O3. Phys. Rev. B 104, 024419 (2021).
  • T.G.H. Blank, K.A. Grishunin, E.A. Mashkovich, M.V. Logunov, A.K. Zvezdin, and A.V. Kimel. THz-Scale Field-Induced Spin Dynamics in Ferrimagnetic Iron Garnets. Phys. Rev. Lett. 127, 037203 (2021).