Experimental observation of quantum many-body excitations of E8 symmetry in the Ising chain ferromagnet CoNb2O6Amelin, Kirill; Engelmayer, Johannes; Viirok, Johan; Nagel, Urmas; Rõõm, Toomas; Lorenz, Thomas; Wang, ZhePhysical review B2020 / art. 104431, 5 p. : ill https://doi.org/10.1103/PhysRevB.102.104431

In situ electric-field control of THz nonreciprocal directional dichroism in the multiferroic Ba2CoGe2O7Vít, J.; Viirok, Johan; Peedu, Laur; Rõõm, Toomas; Nagel, Urmas; Kocsis, V.; Tokunaga, Y.; Taguchi, Y.; Tokura, Y.; Kezsmarki, I.; Balla, P.; Penc, K.; Romhanyi, J.; Bordacs, S.Physical review letters2021 / art. 157201, 6 p. : ill https://doi.org/10.1103/PhysRevLett.127.157201

Observation of E8 articles in an Ising chain antiferromagnetZhang, Zao; Amelin, Kirill; Wang, Xiao; Zou, Haiyuan; Yang, Jiahao; Nagel, Urmas; Rõõm, Toomas; Dey, Tusharkanti; Nugroho, Agustinus Agung; Lorenz, Thomas; Wu, Jianda; Wang, ZhePhysical review B2020 / art. 220411, 6 p. : ill https://doi.org/10.1103/PhysRevB.101.220411

The spectroscopy of the quantum criticality in a transverse field ising chain compound CoNb2O6 [Online resource]Viirok, Johan; Hüvonen, Dan; Rõõm, Toomas; Nagel, UrmasTartu Ülikooli ASTRA projekt PER ASPERA : Funktsionaalsed materjalid ja tehnoloogiad : [4.-5. veebr. 2019, Tartu : teesid]2019 / 1 p http://fmtdk.ut.ee/teesid-2019/

Spin excitations of magnetoelectric LiNiPO4 in multiple magnetic phasesPeedu, Laur; Kocsis, V.; Szaller, D.; Viirok, Johan; Nagel, Urmas; Rõõm, Toomas; Farkas, D.G.; Bordacs, S.; Kamenskyi, D.L.; Zeitler, U.; Tokunaga, Y.; Taguchi, Y.; Tokura, Y.; Kezsmarki, I.Physical review B2019 / art. 024406, 8 p. : ill https://doi.org/10.1103/PhysRevB.100.024406

Spin-waves in magnetoelectric materials with strong single-ion anisotropy = Spinn-lained tugeva anisotroopiaga magnetelektrilistes materjalidesPeedu, Laur2022 https://doi.org/10.23658/taltech.69/2022 https://digikogu.taltech.ee/et/Item/b0fe0699-1bc6-407d-bcce-2d0600f4ddd4 https://www.ester.ee/record=b5527933*est

Symmetry breaking revealed by THz spectroscopy of magnetic excitations = Sümmeetriarikkumiste avaldumine magnetergastuste teraherts-spektritesAmelin, Kirill2022 https://doi.org/10.23658/taltech.47/2022 https://digikogu.taltech.ee/et/Item/15f23ccb-625a-455f-8592-b61b2da787d1 https://www.ester.ee/record=b5511839*est

Terahertz absorption spectroscopy study of spin waves in orthoferrite YFeO3 in a magnetic fieldAmelin, Kirill; Nagel, Urmas; Fishman, R.S.; Yoshida, Y.; Sim, Hasung; Park, Kisoo; Park, Je-Geun; Rõõm, ToomasPhysical review B2018 / art. 174417, 6 p. : ill https://doi.org/10.1103/PhysRevB.98.174417

Terahertz magneto-optical investigation of quadrupolar spin-lattice effects in magnetically frustrated Tb2Ti2O7Amelin, Kirill; Alexanian, Y.; Nagel, Urmas; Rõõm, Toomas; Robert, J.; Debray, J.; Simonet, V.; Decorse, C.; Wang, Z.; Ballou, R.; Constable, E.; de Brion, SophiePhysical review B2020 / art. 134428, 11 p. : ill https://doi.org/10.1103/PhysRevB.102.134428

Terahertz spectroscopy of low-dimensional spin systems = Madalamõõduliste spinnsüsteemide terahertsspektroskoopiaHüvonen, Dan2008 https://www.ester.ee/record=b2375139*est

Terahertz spectroscopy of spin excitations in magnetoelectric LiFePO4 in high magnetic fieldsPeedu, Laur; Kocsis, V.; Szaller, D.; Forrai, B.; Bordacs, S.; Kezsmarki, I.; Viirok, Johan; Nagel, Urmas; Bernath, B.; Kamenskyi, D.L.; Miyata, A.; Portugall, O.; Tokunaga, Y.; Tokura, Y.; Taguchi, Y.; Rõõm, ToomasPhysical review B2022 / art. 134413, 12 p. : ill https://doi.org/10.1103/PhysRevB.106.134413

The study of magnetoelectric effect in multiferroics using THz spectroscopy = Magnetelektrilise nähtuse uurimine multiferroidides THz spektroskoopiagaViirok, Johan2020 https://digikogu.taltech.ee/et/Item/6742e380-e1c5-4f1e-ae2a-8623a8261393