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Higher-order topological insulators
TLDR
The notion of three-dimensional topological insulators is extended to systems that host no gapless surface states but exhibit topologically protected gapless hinge states and it is shown that SnTe as well as surface-modified Bi2TeI, BiSe, and BiTe are helical higher-order topology insulators.
Fractional quantum Hall states at zero magnetic field.
TLDR
A simple prescription to flatten isolated Bloch bands with a nonzero Chern number is presented and perfect flattening can be attained with further range hoppings that decrease exponentially with distance.
New type of Weyl semimetal with quadratic double Weyl fermions
TLDR
It is shown that SrSi2 is a Weyl semimetal even without spin– orbit coupling and that, after the inclusion of spin–orbit coupling, two Weyl fermions stick together forming an exotic double Weylfermion with quadratic dispersions and a higher chiral charge of ±2.
Signatures of the Adler–Bell–Jackiw chiral anomaly in a Weyl fermion semimetal
TLDR
Signs of the Weyl fermion chiral anomaly in the magneto-transport of TaAs are reported and it is observed that high mobility TaAs samples become more conductive as a magnetic field is applied along the direction of the current for certain ranges of the field strength.
Topological nodal-line fermions in spin-orbit metal PbTaSe2
TLDR
The detailed angle-resolved photoemission measurements, first-principles simulations and theoretical topological analysis illustrate the physical mechanism underlying the formation of the topological nodal-line states and associated surface states for the first time, thus paving the way towards exploring the exotic properties of the bottom-line fermions in condensed matter systems.
Unconventional chiral charge order in kagome superconductor KV3Sb5
TLDR
Theoretical analysis of the experiments suggests a tantalizing unconventional chiral charge density wave in the frustrated kagome lattice, which can not only lead to a large anomalous Hall effect with orbital magnetism, but also be a precursor of unconventional superconductivity.
Higher-Order Topology in Bismuth
TLDR
It is established that the electronic structure of bismuth, an element consistently described as bulk topologically trivial, is in fact topological and follows a generalized bulk–boundary correspondence of higher-order: not the surfaces of the crystal, but its hinges host topologically protected conducting modes.
Experimental discovery of a topological Weyl semimetal state in TaP
TLDR
The bulk-boundary correspondence is directly demonstrated and the topologically nontrivial nature of the Weyl semimetal state in TaP is established, by resolving the net number of chiral edge modes on a closed path that encloses the Wey node.
Topological quantum properties of chiral crystals
TLDR
It is shown that Kramers–Weyl fermions are a universal topological electronic property of all non-magnetic chiral crystals with spin–orbit coupling and are guaranteed by structural chirality, lattice translation and time-reversal symmetry.
Two-dimensional frustrated J1−J2 model studied with neural network quantum states
TLDR
This paper uses a fully convolutional neural network model as a variational ansatz to study the frustrated spin-1/2 J1-J2 Heisenberg model on the square lattice and demonstrates that the resulting predictions for both ground-state energies and properties are competitive with, and often improve upon, existing state-of-the-art methods.
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