Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chirality locking charge density waves in a chiral crystal   In Weyl semimetals, charge density wave (CDW) order can spontaneously break
the chiral symmetry, gap out the Weyl nodes, and drive the material into the
axion insulating phase. Investigations have however been limited since CDWs are
rarely seen in Weyl semimetals. Here, using scanning tunneling
microscopy/spectroscopy, we report the discovery of a novel unidirectional CDW
order on the (001) surface of chiral crystal CoSi - a unique Weyl semimetal
with unconventional chiral fermions. The CDW is incommensurate with both
lattice momentum and crystalline symmetry directions, and exhibits an intra
unit cell {\pi} phase shift in the layer stacking direction. The tunneling
spectrum shows a particle-hole asymmetric V-shaped energy gap around the Fermi
level that modulates spatially with the CDW wave vector. Combined with
first-principle calculations, we identify that the CDW is locked to the crystal
chirality and is related by a mirror reflection between the two enantiomers of
the chiral crystal. Our findings reveal a novel correlated topological quantum
state in chiral CoSi crystals and raise the potential for realizing an axion
insulator and exploring the unprecedented physical behaviors of unconventional
chiral fermions.

31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex