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Coherent modulation of the electron temperature and electron-phonon couplings in a 2D material
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- Zhang, Yingchao (författare)
- Univ Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA.
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- Shi, Xun (författare)
- Univ Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA.
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- You, Wenjing (författare)
- Univ Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA.
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- Univ Colorado, Dept Phys, Boulder, CO 80309 USA;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA. Univ Colorado, Dept Phys, Boulder, CO 80309 USA.;Univ Colorado, JILA, Boulder, CO 80309 USA.;NIST, Boulder, CO 80309 USA.;Fudan Univ, State Key Lab Surface Phys, Shanghai 200438, Peoples R China.;Fudan Univ, Dept Phys, Shanghai 200438, Peoples R China. (creator_code:org_t)
- 2020-04-02
- 2020
- Engelska.
- Ingår i: Proceedings of the National Academy of Sciences of the United States of America. - : Proceedings of the National Academy of Sciences. - 0027-8424 .- 1091-6490. ; 117:16, s. 8788-8793
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- Ultrashort light pulses can selectively excite charges, spins, and phonons in materials, providing a powerful approach for manipulating their properties. Here we use femtosecond laser pulses to coherently manipulate the electron and phonon distributions, and their couplings, in the charge-density wave (CDW) material 1T-TaSe2. After exciting the material with a femtosecond pulse, fast spatial smearing of the laser-excited electrons launches a coherent lattice breathing mode, which in turn modulates the electron temperature. This finding is in contrast to all previous observations in multiple materials to date, where the electron temperature decreases monotonically via electron-phonon scattering. By tuning the laser fluence, the magnitude of the electron temperature modulation changes from similar to 200 K in the case of weak excitation, to similar to 1,000 K for strong laser excitation. We also observe a phase change of pi in the electron temperature modulation at a critical fluence of 0.7 mJ/cm(2), which suggests a switching of the dominant coupling mechanism between the coherent phonon and electrons. Our approach opens up routes for coherently manipulating the interactions and properties of two-dimensional and other quantum materials using light.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- charge-density wave
- electron-phonon interactions
- ultrafast science
- ARPES
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