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2016 ; 533
(7602
): 225-9
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Lightwave-driven quasiparticle collisions on a subcycle timescale
#MMPMID27172045
Langer F
; Hohenleutner M
; Schmid CP
; Poellmann C
; Nagler P
; Korn T
; Schüller C
; Sherwin MS
; Huttner U
; Steiner JT
; Koch SW
; Kira M
; Huber R
Nature
2016[May]; 533
(7602
): 225-9
PMID27172045
show ga
Ever since Ernest Rutherford scattered ?-particles from gold foils, collision
experiments have revealed insights into atoms, nuclei and elementary particles.
In solids, many-body correlations lead to characteristic resonances--called
quasiparticles--such as excitons, dropletons, polarons and Cooper pairs. The
structure and dynamics of quasiparticles are important because they define
macroscopic phenomena such as Mott insulating states, spontaneous spin- and
charge-order, and high-temperature superconductivity. However, the extremely
short lifetimes of these entities make practical implementations of a suitable
collider challenging. Here we exploit lightwave-driven charge transport, the
foundation of attosecond science, to explore ultrafast quasiparticle collisions
directly in the time domain: a femtosecond optical pulse creates excitonic
electron-hole pairs in the layered dichalcogenide tungsten diselenide while a
strong terahertz field accelerates and collides the electrons with the holes. The
underlying dynamics of the wave packets, including collision, pair annihilation,
quantum interference and dephasing, are detected as light emission in high-order
spectral sidebands of the optical excitation. A full quantum theory explains our
observations microscopically. This approach enables collision experiments with
various complex quasiparticles and suggests a promising new way of generating
sub-femtosecond pulses.