STEM_LPS retweeted
PRB Editors' Suggestion: #Excitonic #absorption signatures of twisted bilayer
#WSe2 by #ElectronEnergyLossSpectroscopy
S. Y. Woo, A. Zobelli, R. Schneider, A. Arora, J. A. Preuß et al.,
Phys. Rev. B 107, 155429
➡️ go.aps.org/41RW5cf
#EdSugg #condmat @APSPhysics @STEM_LPS
ALT EDITORS' SUGGESTION Excitonic absorption signatures of twisted bilayer WSe 2 by electron energy-loss spectroscopy The excitonic response in twisted bilayer WSe 2 as a function of the moiré angle has been investigated using electron energy loss spectroscopy under cryogenic conditions, and interpreted on the basis of first-principles calculations of the dielectric response of the A A ' stacked bilayer WSe 2 relative to monolayer WSe 2 . This work provides valuable insight into the physical origins of high-energy absorption resonances in twisted bilayers, where the tuning of the excitonic peak C transitions is an effective indicator of the interlayer coupling. Steffi Y. Woo et al. Phys. Rev. B 107, 155429 (2023)
🔬⚡️❄️ Want to track #insitu metal/insulator transitions in a NION monochromated electron microscope ➡️ we're recruiting now a #postdoc in the team @STEM_LPS within the ANR @AgenceRecherche IMPULSE project @LPS_Orsay @UnivParisSaclay @laura_bocher
➡️ equipes2.lps.u-psud.fr/stem/……
STEM_LPS retweeted
Folds and wrinkles in boron nitride (BN) sheets can locally reduce the band gap and may trap charge carriers, find researchers from @STEM_LPS and @chrisewels group
go.acs.org/2Mf
Interested in working on the best monochromated #ElectronMicroscopy and challenging it with #Synchrotron based spectroscopy? Check out our #PhD scholarship where such outstanding tools will be combined to investigate 2D electron gases at oxide interfaces! stem.lps.u-psud.fr/2d-gases-…
We are trying to keep our science going despite current limitations. Today Steffi presented her work on TMDs optics with only her at the @LPS_Orsay using our online teaching facility! She will present the same results soon at EMC2020 online :)
We search a post-doc, specialist on time-resolved spectroscopy (including optics), to work on time-resolved experiments in an electron microscope @LPS_Orsay @UnivParisSaclay, in collaboration with @attolight. For more info, DM @ltizei or @MathieuKociak stem.lps.u-psud.fr/cathodolu…
A #PhDposition on spectro-microscopy of defects in #boronnitride open in our group @UnivParisSaclay. stem.lps.u-psud.fr/phd-posit…
#microscopy #eels #2Dmaterials #cathodoluminescence
Our open access article on plasmon enhanced vibrational EELS spectroscopy (PEVES) is in today's issue @NanoLetters: pubs.acs.org/doi/abs/10.1021…. Its dataset, deposited openly on Zenodo, contains phonon-plasmon coupling monochromated EELS data: zenodo.org/record/3787228#.X…
STEM_LPS retweeted
Christian Colliex: Adventures with atoms and molecules
In 2000, Professor Christian Colliex demonstrated single-atom electron energy loss spectroscopy for the first time. Find out how he pioneered EELS in TEM here. analyticalscience.wiley.com/…
#Microscopy #TEM #EELS
Why scan images in regular patterns? Random patterns give extra information! In authors.elsevier.com/c/1awQI…, we extract the nanometer scale dynamics of defects in hBN, including blinking and state switching. As a bonus, atomic scale sample drift can be corrected. @STEM_LPS
Our article on phonon-plasmon interaction probed by electron energy loss spectroscopy (EELS) is out on @NanoLetter. We observed nanoscale plasmon-enhanced EELS of phonons -a fast electron equivalent to SERS- and a local phonon and plasmon strong coupling doi.org/10.1021/acs.nanolett…
Crucial was a 10 meV monochromated e-beam and the best crystalline samples. Project partly funded by @Esteem3Project, with great collaboration between @LPS_Orsay, @CRNS, @UnivParisSaclay, @CICbiomaGUNE, @ICFOnians and @NIMS_PR
EELS experiments were done on the Chromatem (tempos.fr/ @ANR), a modified Nion machine. Nanowire cutting was performed on a JEOL 2010 (@JEOLEUROPE). Data was acquired and analyzed with NionSwift (@NionSwiftChrisM), Hyperspy (hyperspy.org/) and Python
Our paper in collaboration with Prof. Hikaru Saito from @KyushuUniv_EN is out: it discusses in bandgap states in plasmonic crystals measured with the ChromaTEM (TEMPOS project) . Looking forward to your next visit! @CNRS @CNRSinJapan @UnivParisSaclay
journals.aps.org/prb/abstrac…
Get a rapid overview of Adrien Teurtrie's PhD work between @LPS_Orsay and @GEMaC8635 in his recently published article:
"Atmosphere‐Induced Reversible Resistivity Changes in Ca/Y‐Doped Bismuth Iron Garnet Thin Films" onlinelibrary.wiley.com/doi/……
And good luck for his defense today!
ALT Resistive changes in Y-substituted bismuth iron garnet (BIG) can be fine-tuned by 3 orders of magnitude under controlled atmosphere yielding n-type semiconducting-like resistivity at room temperature. Electron spectro-microscopy techniques evidence additional (Fe2+) charge carriers in the low-resistance state (LRS) relatively to the high-resistance state (HRS).
Marcel explained to us the physics behind different electron detectors in the our journal club. He also announced a change in his scan library name, as we don't do only STEM EELS anymore! It starts on version 1.17, to make OSS 117. Merci @laura_bocher for the pic.
Noémie Bonnet presented her work on NV0/NV- centers in diamond using PL and CL inside a STEM in the @STEM_LPS group meeting at the @LPS_Orsay . She showed us some real color CL emission (greenish light on the mirror) and how to place the sample at the correct height ;)
