Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kondo Phase Transitions of Magnetic Impurities in Carbon Nanotubes   We propose carbon nanotubes (CNTs) with magnetic impurities as a versatile
platform to achieve unconventional Kondo physics, where the CNT bath is gapped
by the spin-orbit interaction and surface curvature. While the strong-coupling
phase is inaccessible for the special case of half-filled impurities in neutral
armchair CNTs, the system in general can undergo quantum phase transitions to
the Kondo ground state. The resultant position-specific phase diagrams are
investigated upon variation of the CNT radius, chirality, and carrier doping,
revealing several striking features, e.g., the existence of a maximal radius
for nonarmchair CNTs to realize phase transitions, and an interference-induced
suppression of the Kondo screening. We show that by tuning the Fermi energy via
electrostatic gating, the quantum critical region can be experimentally
accessed.

31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int