Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 35: PhD Symposium: Quantum Phase Transitions: Emergent Phenomena beyond Elementary Excitations (organized by MA, jDPG)

TT 35.7: Hauptvortrag

Dienstag, 17. März 2015, 14:00–14:30, EB 301

Quantum Criticality in Quantum Magnets — •Christian Rüegg — Paul Scherrer Institute, Laboratory for Neutron Scattering and Imaging, Switzerland — University of Geneva, Department of Quantum Matter Physics, Switzerland

Quantum magnets are exceptional solid-state model systems for high-precision studies of quantum criticality [1]. Recent results from such studies include complex phases like spin Luttinger-liquids and excitations realized in low-dimensional and frustrated systems [2-4], the exciting physics of impurities and quenched disorder [5], and fractionalization and the emergence of novel excitations near quantum critical points [2,6]. Studies of model oxides and halides by neutron scattering and complementary experimental techniques will be presented. These experimental results will be discussed in the context of recent developments of powerful computational methods enabling fully quantitative analysis and of related work on other model systems like gases of ultracold atoms.

[1] T. Giamarchi et al., Nature Physics 4, 198 (2008). [2] B. Thielemann et al., Phys. Rev. Lett. 102, 107204 (2009). [3] Y. Kohama et al., Phys. Rev. Lett. 109, 167204 (2012). [4] F. Casola et al., Phys. Rev. Lett. 110, 187201 (2013). [5] S. Ward et al., J. Phys.: Condens. Matter 25, 014004 (2013). [6] P. Merchant et al., Nature Physics 10, 373 (2014).