10,339 research outputs found
Topological phase in topological Kondo insulator: topological insulator, Haldane-like phase and Kondo breakdown
We have simulated a half-filled -wave periodic Anderson model with
numerically exact projector quantum Monte Carlo technique, and the system is
indeed located in the Haldane-like state as detected in previous works on the
-wave Kondo lattice model, though the soluble non-interacting limit
corresponds to the conventional topological insulator. The
site-resolved magnetization in an open boundary system and strange correlator
for the periodic boundary have been used to identify the mentioned topological
states. Interestingly, the edge magnetization in the Haldane-like state is not
saturated to unit magnetic moment due to the intrinsic charge fluctuation in
our periodic Anderson-like model, which is beyond the description of the Kondo
lattice-like model in existing literature. The finding here underlies the
correlation driven topological state in this prototypical interacting
topological state of matter and naive use of non-interacting picture should be
taken care. Moreover, no trace of the surface Kondo breakdown at zero
temperature is observed and it is suspected that frustration-like interaction
may be crucial in inducing such radical destruction of Kondo screening. The
findings here may be relevant to our understanding of interacting topological
materials like topological Kondo insulator candidate SmB.Comment: 11 pages, 9 figures, accepted by EPJ
catena-Poly[[trimethyltin(IV)]-μ-3,5-difluorobenzoato-κ2 O:O′]
In the title compound, [Sn(CH3)3(C7H3F2O2)]n, the central Sn atom is coordinated by two O atoms from the anion and three methyl C atoms in a polymeric fashion owing to the presence of bidentate bridging carboxylate ligands. The five-coordinate Sn atom exists in a distorted trigonal–bipyramidal geometry with the molecules connected by weak C—H⋯F intermoleclar interactions, forming supramolecular chains parallel to [010]
Extended dual description of Mott transition beyond two-dimensional space
Motivated by recent work of Mross and Senthil [Phys. Rev. B \textbf{84},
165126 (2011)] which provides a dual description for Mott transition from Fermi
liquid to quantum spin liquid in two space dimensions, we extend their approach
to higher dimensional cases, and we provide explicit formalism in three space
dimensions. Instead of the vortices driving conventional Fermi liquid into
quantum spin liquid states in 2D, it is the vortex lines to lead to the
instability of Fermi liquid in 3D. The extended formalism can result in rich
consequences when the vortex lines condense in different degrees of freedom.
For example, when the vortex lines condense in charge phase degrees of freedom,
the resulting effective fermionic action is found to be equivalent to that
obtained by well-studied slave-particle approaches for Hubbard and/or Anderson
lattice models, which confirm the validity of the extended dual formalism in
3D. When the vortex lines condense in spin phase degrees of freedom, a doublon
metal with a spin gap and an instability to the unconventional superconducting
pairing can be obtained. In addition, when the vortex lines condense in both
phase degrees, an exotic doubled U(1) gauge theory occurs which describes a
separation of spin-opposite fermionic excitations. It is noted that the first
two features have been discussed in a similar way in 2D, the last one has not
been reported in the previous works. The present work is expected to be useful
in understanding the Mott transition happening beyond two space dimensions.Comment: 7 pages, no figure
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