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Signatures of fractionalization in spin liquids from interlayer transport | | Yochai Werman
; Shubhayu Chatterjee
; Siddhardh C. Morampudi
; Erez Berg
; | | Date: |
8 Aug 2017 | | Abstract: | Quantum spin liquids (QSLs) are intriguing phases of matter possessing
fractionalized excitations. Several quasi-two dimensional materials have been
proposed as candidate QSLs, but direct evidence for fractionalization in these
systems is still lacking. In this paper, we show that the inter-plane thermal
conductivity in layered QSLs carries a unique signature of fractionalization.
We examine several types of gapless QSL phases - a $Z_2$ QSL with either a
Dirac spectrum or a spinon Fermi surface, and a $U(1)$ QSL with a Fermi
surface. In all cases, the in-plane and $c-$axis thermal conductivities have a
different power law dependence on temperature, due to the different mechanisms
of transport in the two directions: in the planes, the thermal current is
carried by fractionalized excitations, whereas the inter-plane current is
carried by integer (non-fractional) excitations. In layered $Z_2$ and $U(1)$
QSLs with a Fermi surface, the $c-$axis thermal conductivity is parametrically
smaller than the in-plane one, but parametrically larger than the phonon
contribution at low temperatures. | | Source: | arXiv, 1708.2584 | | Services: | Forum | Review | PDF | Favorites | |
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