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Broadband photocarrier dynamics and nonlinear absorption of PLD-grown WTe2semimetal films

Journal Article


Abstract


  • WTe 2 is a unique material in the family of transition metal dichalcogenides and it has been proposed as a candidate for type-II Weyl semimetals. However, thus far, studies on the optical properties of this emerging material have been significantly hindered by the lack of large-area, high-quality WTe 2 materials. Here, we grow a centimeter-scale, highly crystalline WTe 2 ultrathin film (∼35 nm) by a pulsed laser deposition technique. Broadband pump-probe spectroscopy (1.2-2.5 μm) reveals a peculiar ultrafast optical response where an initial photo-bleaching signal (lasting ∼3 ps) is followed by a long-lived photoinduced absorption signature. Nonlinear absorption characterization using femtosecond pulses confirms the saturable absorption response of the WTe 2 ultrathin films, and we further demonstrated a mode-locked Thulium fiber laser using a WTe 2 absorber. Our work provides important insights into linear and nonlinear optical responses of WTe 2 thin films.

Authors


  •   Gao, Wenbin (external author)
  •   Huang, Lei (external author)
  •   Xu, Jinlong (external author)
  •   Chen, Yequan (external author)
  •   Zhu, Chunhui (external author)
  •   Nie, Zhonghui (external author)
  •   Li, Yao (external author)
  •   Wang, Xuefeng (external author)
  •   Xie, Zhenda (external author)
  •   Zhu, Shining (external author)
  •   Xu, Jun (external author)
  •   Wan, Xiangang (external author)
  •   Chao Zhang
  •   Xu, Yongbing (external author)
  •   Shi, Yi (external author)
  •   Wang, Fengqiu (external author)

Publication Date


  • 2018

Citation


  • Gao, W., Huang, L., Xu, J., Chen, Y., Zhu, C., Nie, Z., Li, Y., Wang, X., Xie, Z., Zhu, S., Xu, J., Wan, X., Zhang, C., Xu, Y., Shi, Y. & Wang, F. (2018). Broadband photocarrier dynamics and nonlinear absorption of PLD-grown WTe2semimetal films. Applied Physics Letters, 112 (17), 17112-1-17112-5.

Scopus Eid


  • 2-s2.0-85046017109

Start Page


  • 17112-1

End Page


  • 17112-5

Volume


  • 112

Issue


  • 17

Place Of Publication


  • United States

Abstract


  • WTe 2 is a unique material in the family of transition metal dichalcogenides and it has been proposed as a candidate for type-II Weyl semimetals. However, thus far, studies on the optical properties of this emerging material have been significantly hindered by the lack of large-area, high-quality WTe 2 materials. Here, we grow a centimeter-scale, highly crystalline WTe 2 ultrathin film (∼35 nm) by a pulsed laser deposition technique. Broadband pump-probe spectroscopy (1.2-2.5 μm) reveals a peculiar ultrafast optical response where an initial photo-bleaching signal (lasting ∼3 ps) is followed by a long-lived photoinduced absorption signature. Nonlinear absorption characterization using femtosecond pulses confirms the saturable absorption response of the WTe 2 ultrathin films, and we further demonstrated a mode-locked Thulium fiber laser using a WTe 2 absorber. Our work provides important insights into linear and nonlinear optical responses of WTe 2 thin films.

Authors


  •   Gao, Wenbin (external author)
  •   Huang, Lei (external author)
  •   Xu, Jinlong (external author)
  •   Chen, Yequan (external author)
  •   Zhu, Chunhui (external author)
  •   Nie, Zhonghui (external author)
  •   Li, Yao (external author)
  •   Wang, Xuefeng (external author)
  •   Xie, Zhenda (external author)
  •   Zhu, Shining (external author)
  •   Xu, Jun (external author)
  •   Wan, Xiangang (external author)
  •   Chao Zhang
  •   Xu, Yongbing (external author)
  •   Shi, Yi (external author)
  •   Wang, Fengqiu (external author)

Publication Date


  • 2018

Citation


  • Gao, W., Huang, L., Xu, J., Chen, Y., Zhu, C., Nie, Z., Li, Y., Wang, X., Xie, Z., Zhu, S., Xu, J., Wan, X., Zhang, C., Xu, Y., Shi, Y. & Wang, F. (2018). Broadband photocarrier dynamics and nonlinear absorption of PLD-grown WTe2semimetal films. Applied Physics Letters, 112 (17), 17112-1-17112-5.

Scopus Eid


  • 2-s2.0-85046017109

Start Page


  • 17112-1

End Page


  • 17112-5

Volume


  • 112

Issue


  • 17

Place Of Publication


  • United States