Radiative Auger process in the single-photon limit
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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Radiative Auger process in the single-photon limit. / Lobl, Matthias C.; Spinnler, Clemens; Javadi, Alisa; Zhai, Liang; Nguyen, Giang N.; Ritzmann, Julian; Midolo, Leonardo; Lodahl, Peter; Wieck, Andreas D.; Ludwig, Arne; Warburton, Richard J.
I: Nature Nanotechnology, Bind 15, Nr. 7, 07.2020, s. 558-562.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Radiative Auger process in the single-photon limit
AU - Lobl, Matthias C.
AU - Spinnler, Clemens
AU - Javadi, Alisa
AU - Zhai, Liang
AU - Nguyen, Giang N.
AU - Ritzmann, Julian
AU - Midolo, Leonardo
AU - Lodahl, Peter
AU - Wieck, Andreas D.
AU - Ludwig, Arne
AU - Warburton, Richard J.
N1 - Hy Q
PY - 2020/7
Y1 - 2020/7
N2 - In a radiative Auger process, an excited electron relaxes by concomitant emission of a redshifted photon and energy transfer to another electron. Measuring radiative Auger processes in a quantum dot with single-photon resolution enables determination of the energy of single-electron levels as well as their lifetimes.In a multi-electron atom, an excited electron can decay by emitting a photon. Typically, the leftover electrons are in their ground state. In a radiative Auger process, the leftover electrons are in an excited state and a redshifted photon is created(1-4). In a semiconductor quantum dot, radiative Auger is predicted for charged excitons(5). Here we report the observation of radiative Auger on trions in single quantum dots. For a trion, a photon is created on electron-hole recombination, leaving behind a single electron. The radiative Auger process promotes this additional (Auger) electron to a higher shell of the quantum dot. We show that the radiative Auger effect is a powerful probe of this single electron: the energy separations between the resonance fluorescence and the radiative Auger emission directly measure the single-particle splittings of the electronic states in the quantum dot with high precision. In semiconductors, these single-particle splittings are otherwise hard to access by optical means as particles are excited typically in pairs, as excitons. After the radiative Auger emission, the Auger carrier relaxes back to the lowest shell. Going beyond the original theoretical proposals, we show how applying quantum optics techniques to the radiative Auger photons gives access to the single-electron dynamics, notably relaxation and tunnelling. This is also hard to access by optical means: even for quasi-resonantp-shell excitation, electron relaxation takes place in the presence of a hole, complicating the relaxation dynamics. The radiative Auger effect can be exploited in other semiconductor nanostructures and quantum emitters in the solid state to determine the energy levels and the dynamics of a single carrier.
AB - In a radiative Auger process, an excited electron relaxes by concomitant emission of a redshifted photon and energy transfer to another electron. Measuring radiative Auger processes in a quantum dot with single-photon resolution enables determination of the energy of single-electron levels as well as their lifetimes.In a multi-electron atom, an excited electron can decay by emitting a photon. Typically, the leftover electrons are in their ground state. In a radiative Auger process, the leftover electrons are in an excited state and a redshifted photon is created(1-4). In a semiconductor quantum dot, radiative Auger is predicted for charged excitons(5). Here we report the observation of radiative Auger on trions in single quantum dots. For a trion, a photon is created on electron-hole recombination, leaving behind a single electron. The radiative Auger process promotes this additional (Auger) electron to a higher shell of the quantum dot. We show that the radiative Auger effect is a powerful probe of this single electron: the energy separations between the resonance fluorescence and the radiative Auger emission directly measure the single-particle splittings of the electronic states in the quantum dot with high precision. In semiconductors, these single-particle splittings are otherwise hard to access by optical means as particles are excited typically in pairs, as excitons. After the radiative Auger emission, the Auger carrier relaxes back to the lowest shell. Going beyond the original theoretical proposals, we show how applying quantum optics techniques to the radiative Auger photons gives access to the single-electron dynamics, notably relaxation and tunnelling. This is also hard to access by optical means: even for quasi-resonantp-shell excitation, electron relaxation takes place in the presence of a hole, complicating the relaxation dynamics. The radiative Auger effect can be exploited in other semiconductor nanostructures and quantum emitters in the solid state to determine the energy levels and the dynamics of a single carrier.
KW - QUANTUM DOTS
KW - SHAKE-UP
KW - LUMINESCENCE
KW - TRANSITIONS
KW - EMISSION
U2 - 10.1038/s41565-020-0697-2
DO - 10.1038/s41565-020-0697-2
M3 - Journal article
C2 - 32541943
VL - 15
SP - 558
EP - 562
JO - Nature Nanotechnology
JF - Nature Nanotechnology
SN - 1748-3387
IS - 7
ER -
ID: 247034823