BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:IMX seminar: Photon-Correlation and Electron-Beam Spectroscopy of 
 Solid-State Single-Photon Emitters
DTSTART:20220304T160000
DTEND:20220304T170000
DTSTAMP:20260509T211733Z
UID:3699a509a1a072201d45d72fa2752d7a10e65a5c2797240046ad5456
CATEGORIES:Conferences - Seminars
DESCRIPTION:Hendrik Utzat\, Stanford University\, USA\nPhoton-Correlation 
 and Electron-Beam Spectroscopy of Solid-State Single-Photon Emitters\n\nD
 r. Hendrik Utzat\nDepartment of Materials Science and Engineering\, Stanf
 ord University (USA)\n\nSolid-state single-photon emitters (SPEs) with con
 trolled photon-number\, polarization\, and spectral mode are critical buil
 ding blocks in coherent optoelectronics\, an emerging area with transforma
 tive potential in quantum information processing and energy transduction.[
 1\,2] However\, our understanding of SPE structure-function relationships 
 remains limited\, and only a few classes of SPEs fulfill the stringent dem
 ands on stability\, single-photon purity\, and long optical coherence time
 s set by applications in quantum optics. My talk highlights specific spect
 roscopic tools for assessing SPE photo-physics and identifies pathways for
  their rational chemical design.\nFirst\, I will demonstrate how a combina
 tion of photon-correlation spectroscopy and optical interferometry provide
 s access to SPE optical coherences on timescales inaccessible with other s
 pectroscopic techniques. Using this photon-correlation Fourier spectroscop
 y (PCFS)\, I show that individual lead-halide perovskite quantum dots (PQD
 s) at low temperatures display highly efficient single-photon emission wit
 h minimal spectral diffusion. I further identify remarkable optical cohere
 nce times as long as 80 picoseconds\, an appreciable fraction of their 210
  picoseconds radiative lifetimes.[3\,4] These measurements reveal that PQD
 s are the first colloidal semiconductor nanomaterial with potential applic
 ation in quantum optics and present a starting point for the rational chem
 ical design of lead halide perovskite-based SPEs [5] with fast emission\, 
 wide spectral tunability\, and straightforward hybrid-integration with nan
 ophotonic components. I will briefly touch on recent work on the optical c
 ontrol of detrimental charging dynamics in colloidal SPEs using ultrafast 
 mid-infrared pulses.[6]\nSecond\, I will show how scanning transmission el
 ectron microscopy (STEM) in conjunction with cathodoluminescence (CL) imag
 ing can delineate structure-function relationships of established SPEs wit
 h sub-diffraction limited spatial resolution. We show that different sub-c
 rystalline domains in nanodiamonds containing optically active silicon-vac
 ancy centers (SiV) display changes in zero-phonon line (ZPL) energies and 
 differences in brightness that we correlate with local lattice strain. Our
  results provide a comprehensive picture of the structural sources of inho
 mogeneous broadening of SiVs in diamond and demonstrate the utility of STE
 M-CL in studying critical SPEs photo-physics.[7]\n\n[1] Aharonovich et al.
  Nat. Photonics\, 2016\, 631-641.\n[2] Heinrich et al. Nat. Nanotechnology
 \, 2021\, 16\, 1318-1329.\n[3] Utzat et al. Science\, 2019\, 363 (6431)\, 
 1068-1072.\n[4] Utzat\, Bawendi.\, Optics Express\, 2021\, 29 (10)\, 14293
 -14303.\n[5] Utzat et al. Nano Lett.\, 2017\, 17 (11)\, 6838–6846.\n[6] 
 Shi\, Sun\, Utzat et al. Nat. Nanotechnology (2021).\n[7] Angell\, Utzat e
 t al. (in preparation).\n 
LOCATION:https://epfl.zoom.us/j/69616992522?pwd=K21RMklDcGsycUVTY1YvK21oNT
 M0dz09
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR