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PGI Kolloquium:

Prof. Dr. Jeroen van den Brink,
Leibniz Institute for Solid State and Materials Research (IFW) Dresden & TU Dresden, Dresden, Germany

PGI Lecture Hall, Building 04.8, 2nd Floor, Room 365

23.11.2018 11:00 Uhr

Topological Spin Liquids in Honeycomb Iridates and RuCl3

van den BrinkCopyright: Prof. Dr. van den Brink

The observed richness of topological states on the single-electron level prompts the question what kind of topological phases can develop in more strongly correlated, many-body electron systems. Correlation effects, in particular intra- and inter-orbital electron-electron interactions, are very substantial in 3d transition-metal compounds such as the copper oxides, but the spin-orbit coupling (SOC) is weak. In 5d transition-metal compounds such as iridates, the interesting situation arises that the SOC and Coulomb interactions meet on the same energy scale.

The electronic structure of iridates thus depends on a strong competition between the electronic hopping amplitudes, local energy-level splittings, electron-electron interaction strengths, and the SOC of the Ir 5d electrons. The interplay of these ingredients offers the potential to stabilise relatively well-understood states such as a 2D Heisenberg-like antiferromagnet [1,2] in Sr2IrO4, but in principle also far more exotic ones, such a topological Kitaev quantum spin liquid, in (hyper)honeycomb iridates [3-5].

I will discuss the microscopic electronic structures of these iridates, their proximity to idealized Heisenberg and Kitaev models and our contributions to establishing the physical factors that appear to have preempted the realization of quantum spin liquid phases so far and include a discussion on the 4d transition metal chloride RuCl3 [6,7].


[1] N. Bogdanov, V. Katukuri, J. Romhanyi, V. Yushankhai, V. Kataev, B. Buchner, J. van den Brink and L. Hozoi, Nature Comm. 6, 7306 (2015)
[2] V. Katukuri, V. Yushankhai, L. Siurakshina, J. van den Brink, L. Hozoi and I. Rousochatzakis, Phys. Rev. X 4, 021051 (2014)
[3] S. Nishimoto, V. Katukuri, V. Yushankhai, H. Stoll, U. Roessler, L. Hozoi, I. Rousochatzakis and J. van den Brink, Nature Comm. 7, 10273 (2016)
[4] V. Katukuri, S. Nishimoto, V. Yushankhai, A. Stoyanova, H. Kandpal, Sungkyun Choi, R. Coldea, I. Rousochatzakis, L. Hozoi and J. van den Brink, New J. Phys. 16, 013056 (2014)
[5] V. Katukuri, R. Yadav, L. Hozoi, S. Nishimoto and J. van den Brink, Scientific Reports 6, 29585 (2016)
[6] R. Yadav, N. Bogdanov, V. Katukuri, S. Nishimoto, J. van den Brink and L. Hozoi,  Scientific Reports, 6, 37925 (2016)
[7] A. Koitzsch, C. Habenicht, E. Muller, M. Knupfer, B. Buchner, H. Kandpal, J. van den Brink, D. Nowak, A. Isaeva and Th. Doer, Phys. Rev. Lett. 117, 126403 (2016)


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