Researchers from Basel and Bochum have succeeded in addressing an apparently
unattainable energy transition in an artificial atom using laser light.
Making use of the so-called radiative Auger process, they were the first
team to specifically excite it. In this process, an electron falls from a
higher to a lower energy level and, as a result, emits its energy partly in
the form of light and partly by transferring it to another electron. The
artificial atoms are narrowly defined areas in semiconductors that could one
day form the basis for quantum communication. The findings are described by
the team from the University of Basel and Ruhr-Universität Bochum together
with colleagues from Münster and Wroclaw in Nature Communications, published
online on 12 November 2021.
Electrons move between energy states
Atoms consist of a nucleus and electrons that travel around the nucleus.
These electrons can assume different energy levels. Electrons that are more
tightly bound to the nucleus, i.e. closer to it, have a lower energy than
electrons that are further away from the nucleus. However, the electrons
can't assume any arbitrary energy levels—only certain levels are possible.
If an electron acquires energy, for example by absorbing a light particle,
i.e. photon, it can be raised to a higher energy level. If an electron falls
to a lower energy level, energy is released. This energy can be emitted in
the form of a photon. But it can also be transferred to one of the other
electrons; in this case, only some of the energy is released as light, the
rest is absorbed by the other electron. This process is known as the
radiative Auger process.
Exciting a unique energy transition with two lasers
By irradiating light particles, electrons can not only be lifted to a higher
energy level; they can also be stimulated to give off energy by an incident
light particle. The energy of the incident light particle must always
correspond exactly to the difference in the two energy levels between which
the electron is to be transferred. The researchers have used two lasers: one
moved electrons between a low and a high energy level; the other between the
high and a medium energy level. This middle energy level corresponds to a
non-equilibrium level: the transfer to the middle level doesn't exist
without a radiative Auger process. In addition, a transition between the low
and the medium energy level shouldn't have occurred, because the relevant
light was not irradiated. However, precisely this seemingly impossible
transition occurred in reality due to the energy transfer from one electron
to another in the radiative Auger process.
The ultrapure semiconductor samples for the experiment were produced by Dr.
Julian Ritzmann at Ruhr-Universität Bochum under the supervision of Dr. Arne
Ludwig at the Chair for Applied Solid State Physics headed by Professor
Andreas Wieck. The measurements were carried out by a team from the
University of Basel run by Clemens Spinnler, Liang Zhai, Giang Nguyen and
Dr. Matthias Löbl in the group headed by Professor Richard Warburton.
Reference:
Clemens Spinnler et al, Optically driving the radiative Auger transition,
Nature Communications (2021).
DOI: 10.1038/s41467-021-26875-8
Tags:
Physics