TY - GEN
T1 - Spin-layer- And spin-valley-locking due to symmetry in differently-stacked tungsten disulfide bilayers
AU - Schneider, Lorenz M.
AU - Kuhnert, Jan
AU - Schmitt, Simon
AU - Huttner, Ulrich
AU - Meckbach, Lars
AU - Stroucken, Tineke
AU - Koch, Stephan W.
AU - Heimbrodt, Wolfram
AU - Fu, Shichen
AU - Wang, Xiaotian
AU - Kang, Kyungnam
AU - Yang, Eui Hyeok
AU - Rahimi-Iman, Arash
N1 - Publisher Copyright:
© 2019 IEEE
PY - 2019
Y1 - 2019
N2 - The coupling of the spin and valley degrees of freedom and valley-selective optical selection rules in transition-metal dichalcogenides (TMDCs) monolayers (ML) has been a major research topic in recent years [1]. In contrast, valleytronic properties of TMDC bilayers have not been in the focus so much by now. In our contribution, we study the effect of the relative layer alignment in TMDC homo-bilayer samples on their polarization-dependent optical properties. To this end, CVD-grown WS2 bilayer samples have been prepared that during synthesis favour either the inversion symmetric AA' or AB stacking without inversion symmetry. For the optical studies, the bilayer samples were transferred either onto a bare SiO2 (cf. fig. 1 a,b) or a few-layer h-BN buffer (fig. 1 c,d). To verify the difference in symmetry for these bilayer configurations, second-harmonic-generation (SHG) raster-scans have been performed (cf. fig. 1 e-h), confirming inversion symmetry for the AA' configuration. Subsequently, a detailed analysis of reflection contrast and photoluminescence (PL) spectra under different polarization conditions has been performed.
AB - The coupling of the spin and valley degrees of freedom and valley-selective optical selection rules in transition-metal dichalcogenides (TMDCs) monolayers (ML) has been a major research topic in recent years [1]. In contrast, valleytronic properties of TMDC bilayers have not been in the focus so much by now. In our contribution, we study the effect of the relative layer alignment in TMDC homo-bilayer samples on their polarization-dependent optical properties. To this end, CVD-grown WS2 bilayer samples have been prepared that during synthesis favour either the inversion symmetric AA' or AB stacking without inversion symmetry. For the optical studies, the bilayer samples were transferred either onto a bare SiO2 (cf. fig. 1 a,b) or a few-layer h-BN buffer (fig. 1 c,d). To verify the difference in symmetry for these bilayer configurations, second-harmonic-generation (SHG) raster-scans have been performed (cf. fig. 1 e-h), confirming inversion symmetry for the AA' configuration. Subsequently, a detailed analysis of reflection contrast and photoluminescence (PL) spectra under different polarization conditions has been performed.
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M3 - Conference contribution
AN - SCOPUS:85084574444
SN - 9781728104690
T3 - Optics InfoBase Conference Papers
BT - European Quantum Electronics Conference, EQEC_2019
T2 - European Quantum Electronics Conference, EQEC_2019
Y2 - 23 June 2019 through 27 June 2019
ER -