Ultrafast Spectroscopy of Plasmons and Free Carriers in 2D MXenes
Sign Up to like & getrecommendations! Published in 2022 at "Advanced Materials"
DOI: 10.1002/adma.202208659
Abstract: 2D MXenes have diverse and chemically tunable optical properties that arise from an interplay between free carriers, interband transitions, and plasmon resonances. The nature of photoexcitations and their dynamics in three different members of the… read more here.
Keywords: spectroscopy plasmons; spectroscopy; free carriers; carriers mxenes ... See more keywords
Screened excitons and trions by free carriers in the two-dimensional perovskite structure
Sign Up to like & getrecommendations! Published in 2019 at "Physica E: Low-dimensional Systems and Nanostructures"
DOI: 10.1016/j.physe.2019.05.010
Abstract: Abstract We studied theoretically the screening of the Coulomb interaction in the 2D layered halide organic-inorganic perovskite PEPI. We show that the screening reduces considerably the exciton binding energy at high temperature, acting on the… read more here.
Keywords: free carriers; trions free; screened excitons; excitons trions ... See more keywords
Direct measurement of ferroelectric polarization in a tunable semimetal
Sign Up to like & getrecommendations! Published in 2021 at "Nature Communications"
DOI: 10.1038/s41467-021-25587-3
Abstract: Ferroelectricity, the electrostatic counterpart to ferromagnetism, has long been thought to be incompatible with metallicity due to screening of electric dipoles and external electric fields by itinerant charges. Recent measurements, however, demonstrated signatures of ferroelectric… read more here.
Keywords: tunable semimetal; direct measurement; polarization; ferroelectric polarization ... See more keywords
Long valley relaxation time of free carriers in monolayer WSe 2
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review B"
DOI: 10.1103/physrevb.95.241406
Abstract: Monolayer transition metal dichalcogenids (TMDs) feature valley degree of freedom, giant spinorbit coupling and spin-valley locking. These exotic natures stimulate efforts of exploring the potential applications in conceptual spintronics, valleytronics and quantum computing. Among all… read more here.
Keywords: carriers monolayer; time; valley relaxation; spectroscopy ... See more keywords
80% Valley Polarization of Free Carriers in Singly Oriented Single-Layer WS_{2} on Au(111).
Sign Up to like & getrecommendations! Published in 2019 at "Physical review letters"
DOI: 10.1103/physrevlett.123.236802
Abstract: We employ time- and angle-resolved photoemission spectroscopy to study the spin- and valley-selective photoexcitation and dynamics of free carriers at the K[over ¯] and K[over ¯]^{'} points in singly oriented single-layer WS_{2}/Au(111). Our results reveal… read more here.
Keywords: free carriers; singly oriented; oriented single; polarization ... See more keywords
Enhanced radiation pressure reversal on free carriers in nanoparticles and polarization dependence in the Rayleigh regime
Sign Up to like & getrecommendations! Published in 2021 at "Optical Engineering"
DOI: 10.1117/1.oe.60.2.027104
Abstract: Abstract. The phenomenon of reversed radiation pressure on free electrons in a nanoparticle requires the necessary but insufficient condition that the real part of the particle’s permittivity be negative. It is shown that Rayeigh scattering… read more here.
Keywords: free carriers; enhanced radiation; radiation; radiation pressure ... See more keywords