Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tunable magnetoresistance in an asymmetrically coupled single molecule
  junction   Phenomena that are highly sensitive to magnetic fields can be exploited in
sensors and non-volatile memories. The scaling of such phenomena down to the
single molecule level may enable novel spintronic devices. Here we report
magnetoresistance in a single molecule junction arising from negative
differential resistance that shifts in a magnetic field at a rate two orders of
magnitude larger than Zeeman shifts. This sensitivity to the magnetic field
produces two voltage-tunable forms of magnetoresistance, which can be selected
via the applied bias. The negative differential resistance is caused by
transient charging of an iron phthalocyanine (FePc) molecule on a single layer
of copper nitride (Cu2N) on a Cu(001) surface, and occurs at voltages
corresponding to the alignment of sharp resonances in the filled and empty
molecular states with the Cu(001) Fermi energy. An asymmetric voltage-divider
effect enhances the apparent voltage shift of the negative differential
resistance with magnetic field, which inherently is on the scale of the Zeeman
energy. These results illustrate the impact that asymmetric coupling to
metallic electrodes can have on transport through molecules, and highlight how
this coupling can be used to develop molecular spintronic applications.

30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg