Zobrazeno 1 - 10
of 37
pro vyhledávání: '"Ghioldi, E. A."'
Autor:
Zhang, Shang-Shun, Kato, Yasuyuki, Ghioldi, E. A., Manuel, L. O., Trumper, A. E., Batista, Cristian D.
We develop a systematic large-$N$ expansion based on the Schwinger boson representation of SU(4) coherent states of dimers for the paradigmatic spin-$1/2$ bilayer square lattice Heisenberg antiferromagnet. This system exhibits a quantum phase transit
Externí odkaz:
http://arxiv.org/abs/2409.04627
Autor:
Ghioldi, E. A., Wang, Zhentao, Chinellato, L. M., Zhu, Jian-Xin, Nomura, Yusuke, Arita, Ryotaro, Simeth, W., Janoschek, M., Ronning, F., Batista, C. D.
By utilizing a multi-orbital periodic Anderson model with parameters obtained from \textit{ab initio} band structure calculations, combined with degenerate perturbation theory, we derive effective Kondo-Heisenberg and spin Hamiltonians that capture t
Externí odkaz:
http://arxiv.org/abs/2408.10964
We analyze the temperature evolution of the anomalous magnetic spectrum of the spin-1/2 triangular quantum Heisenberg antiferromagnet, which is proximate to a quantum critical point. Recently, its low energy excitations have been identified with two-
Externí odkaz:
http://arxiv.org/abs/2406.17165
Autor:
Park, Pyeongjae, Ghioldi, E. A., May, Andrew F., Kolopus, James A., Podlesnyak, Andrey A., Calder, Stuart, Paddison, Joseph A. M., Trumper, A. E., Manuel, L. O., Batista, Cristian D., Stone, Matthew B., Halasz, Gabor B., Christianson, Andrew D.
Publikováno v:
Nature Communications 15, 7264 (2024)
The S = 1/2 triangular lattice antiferromagnet (TLAF) is a paradigmatic example of frustrated quantum magnetism. An ongoing challenge involves understanding the influence of exchange anisotropy on the collective behavior within such systems. Using in
Externí odkaz:
http://arxiv.org/abs/2403.03210
Autor:
Scheie, A., Liu, Yu, Ghioldi, E. A., Fender, S., Rosa, P. F. S., Bauer, E. D., Zhu, Jian-Xin, Ronning, F.
We study the magnetic heat capacity of a series of magnetically ordered Ce-based heavy fermion materials, which show an anomalous $T^3$ heat capacity in excess of the phonon contribution in many materials. For compounds for which magnon models have b
Externí odkaz:
http://arxiv.org/abs/2401.10718
Autor:
Simeth, W., Wang, Z., Ghioldi, E. A., Fobes, D. M., Podlesnyak, A., Sung, N. H., Bauer, E. D., Lass, J., Vonka, J., Mazzone, D. G., Niedermayer, C., Nomura, Yusuke, Arita, Ryotaro, Batista, C. D., Ronning, F., Janoschek, M.
Electrons at the border of localization generate exotic states of matter across all classes of strongly correlated electron materials and many other quantum materials with emergent functionality. Heavy electron metals are a model example, in which ma
Externí odkaz:
http://arxiv.org/abs/2208.02211
Autor:
Ghioldi, E. A., Zhang, Shang-Shun, Kamiya, Yoshitomo, Manuel, L. O., Trumper, A. E., Batista, C. D.
Recent inelastic neutron scattering (INS) experiments of the triangular antiferromagnet Ba$_3$CoSb$_2$O$_9$ revealed strong deviations from semiclassical theories. We demonstrate that key features of the INS data are well reproduced by a parton Schwi
Externí odkaz:
http://arxiv.org/abs/2201.13369
Autor:
Scheie, A. O., Ghioldi, E. A., Xing, J., Paddison, J. A. M., Sherman, N. E., Dupont, M., Sanjeewa, L. D., Lee, Sangyun, Woods, A. J., Abernathy, D., Pajerowski, D. M., Williams, T. J., Zhang, Shang-Shun, Manuel, L. O., Trumper, A. E., Pemmaraju, C. D., Sefat, A. S., Parker, D. S., Devereaux, T. P., Movshovich, R., Moore, J. E., Batista, C. D., Tennant, D. A.
Publikováno v:
Nature Physics (2023)
The Heisenberg triangular lattice quantum spin liquid and the phase transitions to nearby magnetic orders have received much theoretical attention, but clear experimental manifestations of these states are rare. This work investigates a new spin-half
Externí odkaz:
http://arxiv.org/abs/2109.11527
The Schwinger boson theory provides a natural path for treating quantum spin systems with large quantum fluctuations. In contrast to semi-classical treatments, this theory allows us to describe a continuous transition between magnetically ordered and
Externí odkaz:
http://arxiv.org/abs/2109.03964
Publikováno v:
Phys. Rev. B 102, 224410 (2020)
We investigate the interplay between spatial anisotropy and further exchange interactions in the spin-$\frac{1}{2}$ Heisenberg antiferromagnetic model on a triangular lattice. We use the Schwinger boson theory by including Gaussian fluctuations above
Externí odkaz:
http://arxiv.org/abs/2009.05447