Zobrazeno 1 - 10
of 80
pro vyhledávání: '"Nagel, Urmas"'
Autor:
Pilch, Patrick, Peedu, Laur, Bera, Anup Kumar, Yusuf, S. M., Nagel, Urmas, Rõõm, Toomas, Wang, Zhe
Publikováno v:
Phys. Rev. B 108, L140406 (2023)
We report terahertz spectroscopic measurements of quantum spin dynamics in the spin-1/2 honeycomb magnet Na$_2$Co$_2$TeO$_6$ as a function of applied magnetic field with different terahertz polarizations. Distinct field dependencies of the resolved s
Externí odkaz:
http://arxiv.org/abs/2308.00631
Autor:
Kocsis, Vilmos, Tokunaga, Yusuke, Rõõm, Toomas, Nagel, Urmas, Fujioka, Jun, Taguchi, Yasujiro, Tokura, Yoshinori, Bordács, Sándor
Orbital degrees of freedom mediating an interaction between spin and lattice were predicted to raise strong magnetoelectric effect, i.e. realize an efficient coupling between magnetic and ferroelectric orders. However, the effect of orbital fluctuati
Externí odkaz:
http://arxiv.org/abs/2301.03292
Autor:
Kocsis, Vilmos, Bordács, Sándor, Tokunaga, Yusuke, Viirok, Johan, Peedu, Laur, Rõõm, Toomas, Nagel, Urmas, Taguchi, Yasujiro, Tokura, Yoshinori, Kézsmárki, István
Publikováno v:
Phys. Rev. B 100, 155124 (2019)
We have studied spin excitations in a single-domain crystal of antiferromagnetic LiCoPO4 by THz absorption spectroscopy. By analyzing the selection rules and comparing the strengths of the absorption peaks in the different antiferromagnetic domains,
Externí odkaz:
http://arxiv.org/abs/2102.00994
Autor:
Rõõm, Toomas, Viirok, Johan, Peedu, Laur, Nagel, Urmas, Farkas, Daniel G., Szaller, David, Kocsis, Vilmos, Bordács, Sandor, Kézsmárki, Istvan, Kamenskyi, Dymtro L., Engelkamp, Hans, Ozerov, Mike, Smirnov, Dmitry, Krzystek, Jurek, Thirunavukkuarasu, Komalavalli, Ozaki, Yasuko, Tomioka, Yasuhide, Ito, Toshimitsu, Datta, Trinanjan, Fishman, Randy S.
Publikováno v:
Phys. Rev. B 102, 214410 (2020)
Using THz spectroscopy, we show that the spin-wave spectrum of multiferroic BiFeO$_3$ in its high-field canted antiferromagnetic state is well described by a spin model that violates rhombohedral symmetry. We demonstrate that the monoclinic distortio
Externí odkaz:
http://arxiv.org/abs/2012.09178
Autor:
Amelin, Kirill, Engelmayer, Johannes, Viirok, Johan, Nagel, Urmas, Rõõm, Toomas, Lorenz, Thomas, Wang, Zhe
Publikováno v:
Phys. Rev. B 102, 104431 (2020)
Close to the quantum critical point of the transverse-field Ising spin-chain model, an exotic dynamic spectrum was predicted to emerge upon a perturbative longitudinal field. The dynamic spectrum consists of eight particles and is governed by the sym
Externí odkaz:
http://arxiv.org/abs/2006.12956
Autor:
Zhang, Zhao, Amelin, Kirill, Wang, Xiao, Zou, Haiyuan, Yang, Jiahao, Nagel, Urmas, Rõõm, Toomas, Dey, Tusharkanti, Nugroho, Agustinus Agung, Lorenz, Thomas, Wu, Jianda, Wang, Zhe
Publikováno v:
Phys. Rev. B 101, 220411 (2020)
Near the transverse-field induced quantum critical point of the Ising chain, an exotic dynamic spectrum consisting of exactly eight particles was predicted, which is uniquely described by an emergent quantum integrable field theory with the symmetry
Externí odkaz:
http://arxiv.org/abs/2005.13772
Autor:
Peedu, Laur, Kocsis, Vilmos, Szaller, Dávid, Viirok, Johan, Nagel, Urmas, Rõõm, Toomas, Farkas, Dániel Gergely, Bordács, Sándor, Kamenskyi, Dmytro, Zeitler, Uli, Tokunaga, Yusuke, Taguchi, Yasujiro, Tokura, Yoshinori, Kézsmárki, István
Publikováno v:
Phys. Rev. B 100, 024406 (2019)
Spin excitations of magnetoelectric LiNiPO$_4$ are studied by infrared absorption spectroscopy in the THz spectral range as a function of magnetic field through various commensurate and incommensurate magnetically ordered phases up to 33\,T. Six spin
Externí odkaz:
http://arxiv.org/abs/1904.06106
Autor:
Kocsis, Vilmos, Penc, Karlo, Rõõm, Toomas, Nagel, Urmas, Vít, Jakub, Romhányi, Judit, Tokunaga, Yusuke, Taguchi, Yasujiro, Tokura, Yoshinori, Kézsmárki, István, Bordács, Sándor
Publikováno v:
Phys. Rev. Lett. 121, 057601 (2018)
The ultimate goal of multiferroic research is the development of new-generation non-volatile memory devices, the so-called magnetoelectric (ME) memories, where magnetic bits are controlled via electric fields without the application of electrical cur
Externí odkaz:
http://arxiv.org/abs/1711.08124
Autor:
Szaller, Dávid, Kocsis, Vilmos, Bordács, Sándor, Fehér, Titusz, Rõõm, Toomas, Nagel, Urmas, Engelkamp, Hans, Ohgushi, Kenya, Kézsmarki, István
Low-energy magnetic excitations of the easy-axis antiferromagnet TbFe$_3$(BO$_3$)$_4$ are investigated by far-infrared absorption and reflection spectroscopy in high magnetic fields up to 30 T. The observed field dependence of the resonance frequenci
Externí odkaz:
http://arxiv.org/abs/1610.04455
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