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Valleytronics in 2D materials
The energy extrema of an electronic band are referred to as valleys. In 2D materials, two distinguishable valleys can be used to encode information and explore other valleytronic applications.
Valley-polarized exciton dynamics in a 2D semiconductor heterostructure
Stacking to prolong valley lifetime In the material MoSe2, which, like graphene, has a two-dimensional honeycomb crystal lattice, the electronic structure has two “valleys.” Electrons can be… Expand
Vapor-solid growth of high optical quality MoS₂ monolayers with near-unity valley polarization.
- S. Wu, C. Huang, G. Aivazian, J. Ross, D. Cobden, X. Xu
- Materials Science, Physics
- ACS nano
- 23 February 2013
Monolayers of transition metal dichalcogenides (TMDCs) are atomically thin direct-gap semiconductors with potential applications in nanoelectronics, optoelectronics, and electrochemical sensing.… Expand
Excitonic luminescence upconversion in a two-dimensional semiconductor
An upconversion from negatively charged to neutral excitons is observed in monolayer tungsten diselenide, which could provide a route for cooling two-dimensional semiconductors using lasers.
Plasmon resonance in individual nanogap electrodes studied using graphene nanoconstrictions as photodetectors.
We achieve direct electrical readout of the wavelength and polarization dependence of the plasmon resonance in individual gold nanogap antennas by positioning a graphene nanoconstriction within the… Expand
Nanocavity Integrated van der Waals Heterostructure Light-Emitting Tunneling Diode.
- Chang-Hua Liu, Genevieve Clark, +5 authors A. Majumdar
- Materials Science, Medicine
- Nano letters
- 11 January 2017
Developing a nanoscale, integrable, and electrically pumped single mode light source is an essential step toward on-chip optical information technologies and sensors. Here, we demonstrate nanocavity… Expand
Silicon photonic crystal cavity enhanced second-harmonic generation from monolayer WSe 2
- Taylor K. Fryett, K. Seyler, Jiajiu Zheng, C. Liu, X. Xu, A. Majumdar
- Materials Science
- 7 December 2016
Nano-resonators integrated with two-dimensional materials (e.g. transition metal dichalcogenides) have recently emerged as a promising nano-optoelectronic platform. Here we demonstrate… Expand
Probing transconductance spatial variations in graphene nanoribbon field- effect transistors using scanning gate microscopy
We have used scanning gate microscopy to probe local transconductance in graphene nanoribbon (GNR) field-effect transistors (FETs) fabricated from chemical vapor deposition-grown graphene.… Expand
Surface morphology and mechanical properties of conventional and self-adhesive resin cements after aqueous aging
- Yahui Pan, X. Xu, Fangfang Sun, X. Meng
- Materials Science, Medicine
- Journal of applied oral science : revista FOB
- 8 November 2018
Abstract The stable long-term performance of resin cement under oral environmental conditions is a crucial factor to obtain a satisfactory success of the allceramic dental restoration. Objective:… Expand