Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Giant magnetochiral anisotropy from quantum confined surface states of
  topological insulator nanowires   Wireless technology relies on the conversion of alternating electromagnetic
fields to direct currents, a process known as rectification. While rectifiers
are normally based on semiconductor diodes, quantum mechanical non-reciprocal
transport effects that enable highly controllable rectification have recently
been discovered. One such effect is magnetochiral anisotropy (MCA), where the
resistance of a material or a device depends on both the direction of current
flow and an applied magnetic field. However, the size of rectification possible
due to MCA is usually extremely small, because MCA relies on electronic
inversion symmetry breaking which typically stems from intrinsic spin-orbit
coupling - a relativistic effect - in a non-centrosymmetric environment. Here,
to overcome this limitation, we artificially break inversion symmetry via an
applied gate voltage in thin topological insulator (TI) nanowire
heterostructures and theoretically predict that such a symmetry breaking can
lead to a giant MCA effect. Our prediction is confirmed via experiments on thin
bulk-insulating (Bi$_{1-x}$Sb$_{x}$)$_2$Te$_3$ TI nanowires, in which we
observe the largest ever reported size of MCA rectification effect in a normal
conductor - over 10000 times greater than in a typical material with a large
MCA - and its behaviour is consistent with theory. Our findings present new
opportunities for future technological applications of topological devices.

20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph