Dresden 2014 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 75: Transport: Majorana fermions (organized by TT)

HL 75.1: Vortrag

Mittwoch, 2. April 2014, 15:00–15:15, HSZ 03

Majorana spin liquid and dimensional reduction in Cs2CuCl4 — •Tim Herfurth, Simon Streib, and Peter Kopietz — Institut für Theoretische Physik, Universität Frankfurt, Max-von-Laue Strasse 1, 60438 Frankfurt, Germany

The low-temperature behavior of the magnetic insulator Cs2CuCl4 can be modeled by an anisotropic triangular lattice spin 1/2 Heisenberg antiferromagnet with two different exchange couplings J and JJ/3 . We show that in a wide range of magnetic fields the experimentally observed field dependence of the crossover temperature Tc for spin-liquid behavior can be explained within a mean-field theory based on the representation of spin operators in terms of Majorana fermions. We also show that for small magnetic fields the specific heat and the spin susceptibility both exhibit a maximum as a function of temperature at Tc = J/2. In the spin-liquid regime, the Majorana fermions can only propagate along the direction of the strongest bond, in agreement with the dimensional reduction scenario advanced by Balents[1].
Nature 464, 199 (2010)

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2014 > Dresden