Photoinduced lattice instability in snse
WebYijing Huang, 2, 3 Shan Yang, Samuel Teitelbaum, 3 Gilberto De la Peña, 3 Takahiro Sato, Matthieu Chollet, Diling Zhu, Jennifer L. Niedziela, 7 Dipanshu Bansal ... WebHere, we report a novel nonthermal lattice instability induced by ultrafast above-gap excitation in SnSe, a representative of the IV-VI class of semiconductors that provides a …
Photoinduced lattice instability in snse
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WebIllustration of lattice structure and lattice softening in SnSe. (a) double bilayer structure of SnSe The in the Pnma phase with Peierls distortions (left panel) and the high-symmetry Cmcm ... is a further evidence supporting our interpretation of a photoinduced switch of point-group symmetry in SnSe. In fact,the A g (0) phonon is determined by ... WebJan 20, 2024 · Here, we investigate the ultrafast carrier and phononic dynamics in SnSe. Our results demonstrate that optical excitations can transiently switch the point-group …
WebThe Immm structure of SnSe is an orthorhombic distortion of the rocksalt structure and does not occur in equilibrium. Density functional theory calculations reveal that the photoinduced Immm lattice instability arises from electron excitation from the Se 4p- and Sn 5s-derived bands deep below the Fermi level that cannot be excited thermally ... WebFeb 1, 2024 · Here, we report a novel nonthermal lattice instability induced by ultrafast above-gap excitation in SnSe, a representative of the IV−VI class of semiconductors that …
WebNov 30, 2024 · The U.S. Department of Energy's Office of Scientific and Technical Information The intensity variations of Bragg peaks at 300 K show a similar trend compared with those observed at 90 K (Fig. 3a), implying that atomic displacements also take place at 300 K during the photoexcitation process. However, the Bragg peak intensities drop faster at 300 K (time constant τ300K ~1.7 ps), comparing to … See more Figure 1a shows a schematic of the MeV-UED experimental setup, where we record diffraction patterns along zone from a single-crystal SnSe as a function … See more The full effect of the phonon contributions to the electron diffraction is also encoded in the diffuse scattering surrounding the Bragg peaks. To monitor the subtle … See more The asymmetrical intensity distribution in the difference maps of the Bragg peaks in time domain is unexpected and cannot be explained by short-wavelength … See more To understand the origin of the domain formation, we performed the DFT calculations (Supplementary Note 11). After tens to hundreds of femtoseconds, the … See more
WebAug 1, 2024 · However, a direct connection between electronic structure and the strong anharmonicity in SnSe, which underpins its ultralow thermal conductivity, has remained elusive. This question is deeply connected with the phonon mode instability and the microscopic mechanism of the phase transition. In this article, we show how the lattice …
WebMar 17, 2024 · We demonstrate via time-resolved x-ray diffraction that SnSe has a photo-induced lattice instability associated with an orthorhombic distortion of the rock-salt … how old is myles onealmercy co worker store st louisWebFeb 14, 2024 · Here we report a novel nonthermal lattice instability induced by ultrafast above-gap excitation in SnSe, a representative of the IV-VI class of semiconductors that … how old is myles turner ageWebOct 13, 2024 · October 13, 2024. Yijing Huang, a postdoctoral scholar at the Department of Energy’s SLAC National Accelerator Laboratory, has received the 2024 LCLS Young Investigator Award for her observation of novel photo-induced lattice instability in femtosecond optical pump and x-ray probe diffraction. The award celebrates early-career … mercy creative ltdWebMechanism for the Soft-mode driven lattice instability in SnSe: Poster session 2: November 16 – 7:00pm – 9:00pm MST (Santa Fe time; Central Europe: 3:00am-5:00am November 17th; Tokyo: 11:00am-1:00pm November 17th) ... Ultrafast charge and lattice dynamics in photoinduced excitonic-insulator to metal transition investigated by pump-probe ... how old is my lg fridgeWebFeb 14, 2024 · Here, we use ultrafast x-ray pulses to measure how the atomic lattice of tin selenide (SnSe) responds to ultrafast optical excitation, finding a novel photoinduced … mercy credit union account loginWebJun 15, 2024 · We report femtosecond optical pump and x-ray diffraction probe experiments on SnSe. We find that under photoexcitation, SnSe has an instability towards an orthorhombically-distorted rocksalt structure that is not present in the equilibrium phase diagram. The new lattice instability is accompanied by a drastic softening of the lowest … mercy created