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Sökning: WFRF:(Lin Jiunn Yuan)

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2.
  • Tu, Chien Ming, et al. (författare)
  • Helicity-dependent terahertz emission spectroscopy of topological insulator S b2 T e3 thin films
  • 2017
  • Ingår i: Physical Review B. - 2469-9950. ; 96:19
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on helicity-dependent terahertz emissions that originate from the helicity-dependent photocurrents in topological insulator Sb2Te3 thin films due to ultrafast optical excitation. The polarity of the emitted terahertz radiation is controlled by both the incident angle and the helicity of optical pulses. Using an unprecedented decomposition-recombination procedure in the time domain, the signals of the Dirac fermions are fully separated from bulk contributions. These results provide insights into the optical coupling of topological surface states and open up opportunities for applying helicity-dependent terahertz emission spectroscopy in spintronics.
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3.
  • Tu, Chien Ming, et al. (författare)
  • Helicity-dependent terahertz radiation from topological insulator Sb2Te3 thin film by femtosecond optical excitation
  • 2016
  • Ingår i: 41st International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2016. - 9781467384858
  • Konferensbidrag (refereegranskat)abstract
    • We report on terahertz radiation from topological insulator (TI) Sb2Te3 thin film under ultrafast optical excitation with different helicity. Polarity-reversals of the emitted THz radiation were observed as the helicity of optical pulses reversed. The observed phenomena are coincident with the characteristics of the helicity-dependent photocurrent on TIs. Our work demonstrates the potential applications of surface photocurrents on TIs for opto-spintronics devices.
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4.
  • Lee, Jenn-Min, et al. (författare)
  • The magnetic order in multiferroic DyMnO3
  • 2021
  • Ingår i: Journal of Electron Spectroscopy and Related Phenomena. - : Elsevier BV. - 0368-2048. ; 246
  • Tidskriftsartikel (refereegranskat)abstract
    • With flexibility in tuning their electric and magnetic properties, multiferroics can be used in information exchange and storage in ways that are very different from the present electronic materials. Here we use resonant soft x-ray scattering spectroscopy to study the -type and -type (0, 1-, 0) diffraction peaks from sinusoidal antiferromagnetic spin order in multiferroic DyMnO. By comparing the temperature dependence of ordering wave vectors , peak intensities , and correlation lengths measured at Mn -, O -, and Dy -edges, we show that the nearly perfect locking between the ordering wave vectors from Dy states and Mn 3 orbitals manifesting the second harmonic diffraction peak implies the notable orbital involvement in the coupling between Mn and Dy spins. Our DFT calculations further suggest that the lattice response to different antiferromagnetic ground states (A-type versus E-type) is much weaker in TbMnO, in agreement with previous claim that the symmetric exchange interaction can be an important factor for understanding the ferroelectricity in DyMnO than in TbMnO.
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  • Resultat 1-4 av 4

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