Zobrazeno 1 - 10
of 50
pro vyhledávání: '"Ruzicka, Brian A."'
Publikováno v:
Physical Review B, 86, 205417 (2012)
Spatiotemporal dynamics of excitons in isolated semiconducting single-walled carbon nanotubes are studied using transient absorption microscopy. Differential reflection and transmission of an 810-nm probe pulse after excitation by a 750-nm pump pulse
Externí odkaz:
http://arxiv.org/abs/1211.0593
Publikováno v:
Phys. Rev. B 86, 045406 (2012)
Atomically-thin molybdenum disulfide is emerging as a new nanomaterial with potential applications in the fields of electronic and photonics. Charge carrier dynamics plays an essential role in determining its electronic and optical properties. We rep
Externí odkaz:
http://arxiv.org/abs/1206.6055
Publikováno v:
Optics Materials Express 2, 708 (2012)
Carrier dynamics in single-layer graphene grown by chemical vapor deposition (CVD) is studied using spatially and temporally resolved pump-probe spectroscopy by measuring both differential transmission and differential reflection. By studying the exp
Externí odkaz:
http://arxiv.org/abs/1204.5732
Autor:
Ruzicka, Brian A., Werake, Lalani K., Xu, Guowei, Khurgin, Jacob B., Sherman, E. Ya., Wu, Judy Z., Zhao, Hui
Publikováno v:
Phys. Rev. Lett. 108, 077403 (2012)
We demonstrate a new, nonlinear optical effect of electric currents. First, a steady current is generated by applying a voltage on a doped GaAs crystal. We demonstrate that this current induces second-harmonic generation of a probe laser pulse. Secon
Externí odkaz:
http://arxiv.org/abs/1112.5140
Femtosecond optical pump-probe technique is used to study charge carrier dynamics in few-layer MoS2 samples fabricated by mechanical exfoliation. An ultrafast pump pulse excites carriers and differential reflection of a probe pulse tuned to an excito
Externí odkaz:
http://arxiv.org/abs/1110.6643
Autor:
Kumar, Nardeep, Ruzicka, Brian A., Butch, N. P., Syers, P., Kirshenbaum, K., Paglione, J., Zhao, Hui
Publikováno v:
Phys. Rev. B 83, 235306 (2011)
Carrier and phonon dynamics in Bi2Se3 crystals are studied by a spatially resolved ultrafast pump-probe technique. Pronounced oscillations in differential reflection are observed with two distinct frequencies, and are attributed to coherent optical a
Externí odkaz:
http://arxiv.org/abs/1104.0349
Publikováno v:
J. Appl. Phys.109, 084322 (2011)
The energy relaxation of carriers in reduced graphene oxide thin films is studied using optical pump-probe spectroscopy with two probes of different colors. We measure the time difference between peaks of the carrier density at each probing energy by
Externí odkaz:
http://arxiv.org/abs/1103.0728
Publikováno v:
Phys. Rev. Lett. 106, 107205 (2011)
We report observation of intrinsic inverse spin Hall effect in un-doped GaAs multiple quantum wells with a sample temperature of 10 K. A transient ballistic pure spin current is injected by a pair of laser pulses through quantum interference. By time
Externí odkaz:
http://arxiv.org/abs/1102.1958
Publikováno v:
Appl. Phys. Lett. 97, 262119 (2010)
The ambipolar carrier diffusion in bulk GaAs is studied by using an ultrafast pump-probe technique with a high spatial resolution. Carriers with a point-like spatial profile are excited by a tightly focused pump laser pulse. The spatiotemporal dynami
Externí odkaz:
http://arxiv.org/abs/1102.1366
Publikováno v:
Phys. Rev. B 82, 195414 (2010)
We report an optical study of charge transport in graphene. Diffusion of hot carriers in epitaxial graphene and reduced graphene oxide samples are studied using an ultrafast pump-probe technique with a high spatial resolution. Spatiotemporal dynamics
Externí odkaz:
http://arxiv.org/abs/1005.3850