Zobrazeno 1 - 10
of 681
pro vyhledávání: '"Casa, D"'
Autor:
Hepting, M., Boyko, T. D., Zimmermann, V., Bejas, M., Suyolcu, Y. E., Puphal, P., Green, R. J., Zinni, L., Kim, J., Casa, D., Upton, M. H., Wong, D., Schulz, C., Bartkowiak, M., Habicht, K., Pomjakushina, E., Cristiani, G., Logvenov, G., Minola, M., Yamase, H., Greco, A., Keimer, B.
Publikováno v:
Phys. Rev. B 107, 214516 (2023)
We use resonant inelastic x-ray scattering (RIXS) at the O $K$- and Cu $K$-edges to investigate the doping- and temperature dependence of low-energy plasmon excitations in La$_{2-x}$Sr$_{x}$CuO$_4$. We observe a monotonic increase of the energy scale
Externí odkaz:
http://arxiv.org/abs/2306.15650
Autor:
de la Torre, A., Zager, B., Chamorro, J. R., Upton, M. H., Fabbris, G., Haskel, D., Casa, D., McQueen, T. M., Plumb, K. W.
We investigate the electronic structure of two Ir$^{5+}$ honeycomb iridates, Sr$_3$CaIr$_2$O$_9$ and NaIrO$_3$, by means of resonant x-ray techniques. We confirm that Sr$_3$CaIr$_2$O$_9$ realizes a large spin-orbit driven non-magnetic $J = 0$ singlet
Externí odkaz:
http://arxiv.org/abs/2206.11310
Autor:
Mazzone, D. G., Shen, Y., Suwa, H., Fabbris, G., Yang, J., Zhang, S-S., Miao, H., Sears, J., Jia, Ke, Shi, Y. G., Upton, M. H., Casa, D. M., Liu, X., Liu, J., Batista, C. D., Dean, M. P. M.
Publikováno v:
Nature Communications volume 13, Article number: 913 (2022)
Excitonic insulators are usually considered to form via the condensation of a soft charge mode of bound electron-hole pairs. This, however, presumes that the soft exciton is of spin-singlet character. Early theoretical considerations have also predic
Externí odkaz:
http://arxiv.org/abs/2201.04030
Autor:
Shen, Y., Sears, J., Fabbris, G., Weichselbaum, A., Yin, W., Zhao, H., Mazzone, D. G., Miao, H., Upton, M . H., Casa, D., Acevedo-Esteves, R., Nelson, C., Barbour, A. M., Mazzoli, C., Cao, G., Dean, M. P. M.
Spinons are well-known as the elementary excitations of one-dimensional antiferromagnetic chains, but means to realize spinons in higher dimensions is the subject of intense research. Here, we use resonant x-ray scattering to study the layered trimer
Externí odkaz:
http://arxiv.org/abs/2201.02567
Autor:
de la Torre, A., Zager, B., Bahrami, F., DiScala, M., Chamorro, J. R., Upton, M. H., Fabbris, G., Haskel, D., Casa, D., McQueen, T. M., Tafti, F., Plumb, K. W.
Publikováno v:
Phys. Rev. B 104, 100416 (2021)
We use x-ray spectroscopy at Ir L$_3$/L$_2$ absorption edge to study powder samples of the intercalated honeycomb magnet Ag$_3$LiIr$_2$O$_6$. Based on x-ray absorption and resonant inelastic x-ray scattering measurements, and exact diagonalization ca
Externí odkaz:
http://arxiv.org/abs/2106.05309
Autor:
Mazzone, D. G., Meyers, D., Cao, Y., Vale, J. G., Dashwood, C. D., Shi, Y., James, A. J. A., Robinson, N. J., Lin, J. Q., Thampy, V., Tanaka, Y., Johnson, A. S., Miao, H., Wang, R., Assefa, T. A., Kim, J., Casa, D., Mankowsky, R., Zhu, D., Alonso-Mori, R., Song, S., Yavas, H., Katayama, T., Yabashi, M., Owada, Y. Kubota S., Liu, J., Yang, J., Konik, R. M., Robinson, I. K., Hill, J. P., McMorrow, D. F., Forst, M., Wall, S., Liu, X., Dean, M. P. M.
Publikováno v:
PNAS 118 e2103696118 (2021)
Although ultrafast manipulation of magnetism holds great promise for new physical phenomena and applications, targeting specific states is held back by our limited understanding of how magnetic correlations evolve on ultrafast timescales. Using ultra
Externí odkaz:
http://arxiv.org/abs/2002.07301
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Autor:
Wang, Y., Wang, Ruitang, Kim, Jungho, Upton, M. H., Casa, D., Gog, T., Cao, G., Kotliar, G., Dean, M. P. M., Liu, X.
Publikováno v:
Phys. Rev. Lett. 122, 106401 (2019)
The electronic states of many Mott insulators, including iridates, are often conceptualized in terms of localized atomic states such as the famous "$J_\text{eff}=1/2$ state". Although, orbital hybridization can strongly modify such states and dramati
Externí odkaz:
http://arxiv.org/abs/1810.05243
Autor:
Porras, J., Bertinshaw, J., Liu, H., Khaliullin, G., Sung, N. H., Kim, J. -W., Francoual, S., Steffens, P., Deng, G., Sala, M. Moretti, Effimenko, A., Said, A., Casa, D., Huang, X., Gog, T., Kim, J., Keimer, B., Kim, B. J.
Publikováno v:
Phys. Rev. B 99, 085125 (2019)
Spin-orbit entangled magnetic dipoles, often referred to as pseudospins, provide a new avenue to explore novel magnetism inconceivable in the weak spin-orbit coupling limit, but the nature of their low-energy interactions remains to be understood. We
Externí odkaz:
http://arxiv.org/abs/1808.06920
Autor:
Kim, Young-June, Clancy, J. P., Gretarsson, H., Cao, G., Singh, Yogesh, Kim, Jungho, Upton, M. H., Casa, D., Gog, T.
We report a comprehensive resonant inelastic x-ray scattering (RIXS) study of various iridate materials focusing on core-level excitations and transitions between crystal-field split d-levels. The 2p core hole created at the Ir $L_3$ absorption edge
Externí odkaz:
http://arxiv.org/abs/1805.03612