Journal
PHYSICAL REVIEW B
Volume 100, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.100.094301
Keywords
-
Funding
- FAPESP (SPEC Project) [2012/50259-8]
- FAPESP (Thematic Project) [2015/11779-4]
- Brazilian Nanocarbon Institute of Science and Technology (INCT/Nanocarbono)
- Fapemig
- CNPq
- CAPES PRINT (Programa Institucional de Internacionalizacao) [88887.310281/2018-00]
- MackPesquisa
- FAPESP [2017/20100-0, 2018/04926-9]
Ask authors/readers for more resources
Germanium sulfide (GeS) and germanium selenide (GeSe) are layered orthorhombic crystals whose structure bears a strong resemblance with that of black phosphorus and, additionally, are expected to exhibit high piezoelectricity in the few layer domain. In this work, we investigate the Raman properties of exfoliated GeS and GeSe and show that their edges exhibit unusual polarized Raman features that were first observed in black phosphorus. The results include the activation in the spectra of otherwise not allowed modes at the edges of the sample, depending on the crystallographic direction of the edge and the polarization configuration used in the measurements. These features are attributed to atomic rearrangements at the crystal terminations, as well as their impact on phonon symmetries, similar to the case of black phosphorus. Our conclusions are further corroborated by using density functional theory and suggest that edge rearrangements, which will have an impact on the mechanical, electronic, and chemical properties of devices, is a general phenomenon of orthorhombic layered structures.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available