Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Local Defect in Metallic Quantum Critical Systems   We present a theory of a single point, line or plane defect coupling to the
square of the order parameter in a metallic system near a quantum critical
point at or above its upper critical dimension. At criticality, a spin droplet
is nucleated around the defect with droplet core size determined by the
strength of the defect potential. Outside the core a universal slowly decaying
tail of the droplet is found, leading to many dissipative channels coupling to
the droplet and to a complete suppression of quantum tunneling. We propose an
NMR experiment to measure the impurity-induced changes in the local spin
susceptibility.

23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex