Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optically induced rotation of a quantum dot exciton spin   We demonstrate control over the spin state of a semiconductor quantum dot
exciton using a polarized picosecond laser pulse slightly detuned from a
biexciton resonance. The control pulse follows an earlier pulse, which
generates an exciton and initializes its spin state as a coherent superposition
of its two non-degenerate eigenstates. The control pulse preferentially couples
one component of the exciton state to the biexciton state, thereby rotating the
exciton's spin direction. We detect the rotation by measuring the polarization
of the exciton spectral line as a function of the time-difference between the
two pulses. We show experimentally and theoretically how the angle of rotation
depends on the detuning of the second pulse from the biexciton resonance.

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The categories of this paper are: hep-ph
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
3
The categories of this paper are: physics