Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 33: Low-dimensional Systems - Models II

TT 33.8: Vortrag

Freitag, 30. März 2007, 12:15–12:30, H18

Nonmagnetic impurities in fractionalized spin liquids — •Alexei Kolezhuk¹ and Subir Sachdev² — ¹Institut für Theoretische Physik, Universität Hannover, 30167 Hannover, Germany — ²Physics Department, Harvard University, Cambridge MA 02138, USA

Spin correlations in the vicinity of a nonmagnetic impurity are analyzed for two models of gapless U(1) spin liquids in two dimensions: (1) deconfined critical point between the Neel and valence-bond-solid (VBS) phase; (2) staggered flux spin liquid. The impurity susceptibility in both cases exhibits a 1/T temperature dependence with an anomalous Curie constant. It is shown that an external magnetic field induces both uniform and staggered magnetization around the impurity in the Neel-VBS case, while in the staggered flux phase only the uniform component is present.