Valley polarization in MoS2 monolayers by optical pumping.
By H. Zeng, J. Dai, W. Yao, Di Xiao, X. Cui. Nature Nanotechnology, 2012
3,330 citations recorded by the source corpus.
Most electronic devices exploit the electric charge of electrons, but it is also possible to build devices that rely on other properties of electrons. Spintronic devices, for example, make use of the spin of electrons. Valleytronics is a more recent development that relies on the fact that the conduction bands of some materials have two or more minima at equal energies but at different positions in momentum space. To make a valleytronic device it is necessary to control the number of electrons in these valleys, thereby producing a valley polarization. Single-layer MoS(2) is a promising material for valleytronics because both the conduction and valence band edges have two energy-degenerate valleys at the corners of the first Brillouin zone. Here, we demonstrate that optical pumping with circularly polarized light can achieve a valley polarization of 30% in pristine monolayer MoS(2). Our results, and similar results by Mak et al., demonstrate the viability of optical valley control and valley-based electronic and optoelectronic applications in MoS(2) monolayers.
Subfields: Electrical and Electronic Engineering, Materials Chemistry, Molecular Biology
View Paper: https://www.semanticscholar.org/paper/6368d0a558a2cd43399d3b48bcbb1c1cbeabe832
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In Electrical and Electronic Engineering
- A. Castellanos-Gómez
- Hongyi Yu
- Edmund J. R. Kelleher
- R. I. Woodward
- Xiaodong Xu
- W. Yao
- A. Di Bartolomeo
- Thomas Mueller
In Materials Chemistry
- A. Castellanos-Gómez
- W. Yao
- Thomas Mueller
- G. Steele
- Herre S. J. van der Zant
- A. Di Bartolomeo
- Xiaodong Xu
- E. Malic
In Molecular Biology
Citations in the corpus
- Topological polaritons from quantum wells in photonic waveguides or microcavities (2014, positive): “[46] Hualing Zeng, Junfeng Dai, Wang Yao, Di Xiao, and Xiaodong Cui, “Valley polarization in MoS2 monolayers by optical pumping,” Nat Nano 7, 490–493 (2012).”
- Angle-resolved photoemission studies of quantum materials (2020, positive): “…(Alidoust et al., 2014; Zhang 45 et al., 2014d), providing direct electronic evidence for the mechanism of valley-selective optical excitations via circularly polarized light observed via photoluminescence (Mak et al., 2012; Zeng et al., 2012) as well as trARPES (Bertoni et al., 2016).”
- Few-layer MoS2: a promising layered semiconductor. (2014, background): “single-layer MoS2 opens up a whole new host of possibilities in optical properties and optoelectronic devices.(53,90,130,134) 140 Photoluminescence studies show a very high quantum yield for monolayer MoS2 and also affirm the optical transition band gap at around 1.”
- The effect of the substrate on the Raman and photoluminescence emission of single-layer MoS2 (2013, methodology): “To deposit MoS2 over h-BN, mica or FLG flakes, the h-BN, mica or FLG flakes are firstly transferred onto a SiO2/Si wafer by mechanical exfoliation and then a deterministic all-dry stamping method was used to transfer the MoS2 onto the selected h-BN or FLG flake [12,13].”
- Control of two-dimensional excitonic light emission via photonic crystal (2013, background): “Figures 1(a) and (b) show typical devices with light emitting materials (multi-quantum wells) embedded into a 2D PhC, which employs its photonic band-gap [23] and diffraction grating effect [24], to redistribute the emitted photons.”