2018/12/31 by Makoto Iwasaki, M. Iwasaki, Tsutom Yotsuya +7 · 2 citations
Chemistry · Computer Science · Physics and Astronomy · #Atomic physics #Charge (physics) #Charged particle #Chemistry #Cold Atom Physics and Bose-Einstein Condensates #Computational physics #Electric charge #Electric field #Electric potential #Ion #Materials science #Mechanical and Optical Resonators #Molecular physics #Nanoparticle #Optoelectronics #Oscillation (cell signaling) #Physics #Quantum Information and Cryptography #Quantum dot #Quantum mechanics #Trap (plumbing) #Voltage #cond-mat.mes-hall
paper · pdf · doi:10.1103/physreva.99.051401
published as Phys. Rev. A 99, 051401 (2019) · 6 pages, 5 figures
arxiv created 2019/05/07 · openalex publication_date 2019/05/16 · arxiv updated 2019/05/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We demonstrate feedback cooling of the center-of-mass motion of single charged nanoparticles to millikelvin temperatures in three dimensions via applying oscillating electric fields synchronized to their optically observed motion. The observed motional temperatures at weak feedback agree with a simple model and allow us to estimate the charge number of trapped nanoparticles. The agreement between our model and experiments is confirmed by independent measurements of the charge numbers based on a shift in the oscillation frequency induced by a constant electric field. The demonstrated temperature of less than 10\phantom\rule0.16em0exmK at 4\ifmmode×\else\texttimes\fi10^\ensuremath-3\phantom\rule0.16em0exPa is lower than that with the conventional optical cooling approach at this pressure by one to two orders of magnitude. Our results form the basis of manipulating cold charged nanoparticles and pave the way to quantum mechanical studies with trapped nanoparticles near their ground state.