Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 14: Correlated Electrons: Low-Dimensional Systems - Models 2

TT 14.11: Talk

Monday, March 11, 2013, 17:45–18:00, H9

Magnetic order-by-disorder in a distorted Heisenberg-Kitaev model — •Max Henner Gerlach¹, Eran Sela^{1, 2}, Hong-Chen Jiang³, Oliver Wohak¹, and Simon Trebst¹ — ¹Institut für Theoretische Physik, Universität zu Köln — ²Tel Aviv University, Ramat Aviv, Israel — ³Kavli Institute for Theoretical Physics, University of California, Santa Barbara, USA

Motivated by the recent experimental observation of Mott insulating states for the layered iridates Na₂IrO₃ and Li₂IrO₃, we discuss possible ordering states of the effective iridium moments in the presence of strong spin-orbit coupling and weak exchange anisotropies induced by lattice distortions. We find that the Heisenberg-Kitaev model – suggested to capture the exchanges of the effective j=1/2 Iridium moments – in the presence of distortions exhibits a rich phase diagram of both conventionally ordered magnetic states as well as exotic topologically ordered and spin liquid states, which we will discuss in detail in this talk. Particular emphasis will be put on the classical counterpart of this model and the order-by-disorder physics that stabilizes certain ordering patterns over wide ranges of its phase diagram.