ELFT HÍRADÓ

[Janos Asboth <asboth AT phy.bme.hu>]

Meghívó

BME Elméleti Fizika Szeminárium,

február 12. péntek 10h15,
online a Microsoft Teams-ben
<https://teams.microsoft.com/l/meetup-join/19%3a35c712c192104aa998ed6bab3f0cbc07%40thread.tacv2/1612940349411?context=%7b%22Tid%22%3a%226a3548ab-7570-4271-91a8-58da00697029%22%2c%22Oid%22%3a%22c7eaf7d2-684b-4597-b217-6a9121400219%22%7d>

Simon Ferenc (BME Fizika tanszék):
Triplet exciton states in carbon nanotubes: a possible candidate for
telecomm compatible qubits

Finding a suitable qubit which emits in the near infrared range is the holy
grail of ongoing quantum telecommunication research. We propose the
recently discovered [1] triplet exciton states in carbon nanotubes for this
purpose, whose fundamental properties (energy structure, relaxation time)
are now established. I first review the photophysics of best known solid
state qubit, the nitrogen-vacancy (NV) center in diamond, which nominally
emits in the visible range, far from the so-called telecom frequency
windows. I then describe our experimental efforts in developing a
specialized optically detected magnetic resonance spectrometer [2], which
allowed detection of the otherwise dark triplet excitons in single-walled
carbon nanotubes. I show that the nanotube geometry allows for a fine
tuning of the emission energies. I present evidence for a singlet-triplet
splitting due to quantum confinement and the observation of an exciton
energy transfer between nanotubes, which may allow for quantum information
transcription.
https://dept.physics.bme.hu/SpinSpectroscopy

[1] J. Palotás et al. ACS Nano 14, 11254 (2020). (
https://arxiv.org/pdf/2009.06314.pdf)
[2] M. Negyedi et al. Rev. Sci. Instrum. 88, 013902 (2017). (
https://arxiv.org/pdf/1610.01177.pdf)

Minden érdeklődőt szeretettel várunk.

Asbóth János
szemináriumi koordinátor