Seminars axis “From nano-to life- sciences”

14h00-14h45 : Pr Ewen BODIO (Laboratoire CEISAM UMR-CNRS 6230 / Nantes Université )

Titre : From Aza-BODIPY to WazaGaY: Toward efficient NIR-emitting OI/PET bimodal probes design.

14h45-15h30 : Dr Célia BONNET (Laboratoire CBM UPR CNRS 4301 / Orléans)

Titre : Cation responsive MRI contrast agents: from rational design to in vivo applications.

Seminar presented by Dr. Salambô Dago

Speaker : Dr. Salambô Dago

Vienna Center for Quantum Science and Technology (VCQ) University of Vienna)

Résumé : Feedback control provides a versatile tool for manipulating nanoscale systems dominated by thermal or quantum fluctuations. We present two experimental applications of feedback to explore non equilibrium physics. First, we demonstrate how a feedback loop can create a virtual double potential for an underdamped micromechanical oscillator, enabling a 1-bit memory platform to perform fast logical operations and investigate the energetic cost of information processing [1-5].
Second, we introduce FLIP (Feedback Stabilization on an Inverted Potential), a novel feedback scheme combining Kalman filtering with optical trapping to achieve quantum control [6] and ground-state cooling of levitated nanospheres. This approach allows stable levitation in a double-well configuration while mitigating absorption, opening new routes for optical manipulation at the quantum limit [7].

[1] S. Dago, J. Pereda, S. Ciliberto, and L. Bellon,. JSTAT, 2022(5):053209, (2022).
[2] S. Dago, J. Pereda, N. Barros, S. Ciliberto, and L. Bellon, Phys. Rev. Lett., 126:170601 (2021).
[3] S. Dago, and L. Bellon, Phys. Rev. Lett., 128, 070604 (2022)
[4] S. Dago, L. Bellon, Phys. Rev. E 108, L022101 (2023)
[5] S. Dago, S. Ciliberto and L. Bellon, PNAS Vol.120, No 39
[6] L. Magrini, P. Rosenzweig, C. Bach, A. Deutschmann-Olek, S. G. Hofer, S. Hong, N. Kiesel, A. Kugi
Nature 595, 373 (2021).
[7] S. Dago, J. Rieser, M. Ciampini, V. Mlynar, M. Aspelmeyer, A. Deutschmann-Olek et N. Kiesel Optics
Express 32, 45133-45141 (2024

Contact : Cyriaque Genet
genet@unistra.fr / 03 68 85 51 96

Quantum sciences and materials seminar prensented by : Alexina Ollier

Speaker: Alexina Ollier, Center for Quantum Nanoscience (QNS), Institute for Basic Science (IBS), Seoul, South Korea

Here, we report on imaging the spin texture of triple-Q magnetic order of Co1/3TaS2. The sample
was measured with a low temperature STM (T=6K) under ultra-high vacuum with normal
and spin-polarized tips. The STM images with the normal tip show the triangular lattice of the
sample. The spin-polarized (SP) tip shows an additional symmetry related to the triple-Q
ordering. In addition to that, the SP STM images revealed different spin textures with respect
to the tip-spin orientation. The analysis suggests the presence of a phase difference between the
tip and the triple-Q ordering of the sample. This work gives a new insight into the exploration of
chiral magnetic ordering with topological Hall effect using scanning probe microscopy.