Cliò Efthimia Agrapidis, StefanLudwig Drechsler, Jeroen van den Brink, Satoshi Nishimoto
SciPost Phys. 6, 019 (2019) ·
published 6 February 2019

· pdf
Frustrated onedimensional (1D) magnets are known as ideal playgrounds for
new exotic quantum phenomena to emerge. We consider an elementary frustrated 1D
system: the spin$\frac{1}{2}$ ferromagnetic ($J_1$) Heisenberg chain with
nextnearestneighbor antiferromagnetic ($J_2$) interactions. On the basis of
densitymatrix renormalization group calculations we show the existence of a
finite spin gap at $J_2/J_1>1/4$ and we find the ground state in this region
to be a valence bond solid (VBS) with spinsinglet dimerization between
thirdneighbor sites. The VBS is the consequence of spontaneous symmetry
breaking through order by disorder. Quite interestingly, this VBS state has a
AffleckKennedyLiebTasakitype topological order. This is the first example
of a frustrated spin chain in which quantum fluctuations induce gapped
topological order.
Commentaries
Commentaries for which this Contributor is identified as an author:
by J. Schlappa, K. Wohlfeld, K. J. Zhou, M. Mourigal, M. W. Haverkort, V. N. Strocov, L. Hozoi, C. Monney, S. Nishimoto, S. Singh, A. Revcolevschi, J.S. Caux, L. Patthey, H. M. Rønnow, J. van den Brink, T. Schmitt, Nature 485, 8285
Spin–orbital separation in the quasionedimensional Mott insulator Sr2CuO3
by J. Schlappa, K. Wohlfeld, K. J. Zhou, M. Mourigal, M. W. Haverkort, V. N. Strocov, L. Hozoi, C. Monney, S. Nishimoto, S. Singh, A. Revcolevschi, J.S. Caux, L. Patthey, H. M. Rønnow, J. van den Brink, T. Schmitt, Nature 485, 8285
(published 20120418) · latest activity: 20191018 14:06