Optical manipulation of valley pseudospin
WebSep 19, 2016 · Here we demonstrate all-optical control of the valley coherence by means of the pseudomagnetic field associated with the optical Stark effect. Using below-bandgap … WebOne of the unique features of these monolayer materials, the valley pseudospin, can be manipulated by controlling the local properties of optical fields. Here, we discuss two manifestations of ...
Optical manipulation of valley pseudospin
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WebMing-Hui Chiu,4Lain-Jong Li,3,4Feng Wang1,2,5† The valley pseudospin is a degree of freedom that emerges in atomically thin two-dimensional transition metal dichalcogenides (MX 2).The capability to manipulate it, in analogy to the control of spin in spintronics, can open up exciting opportunities. WebMonolayer valley semiconductors, such as tungsten diselenide (WSe$_2$), possess valley pseudospin degrees of freedom that are optically addressable but degenerate in energy. Lifting the energy degeneracy by breaking time-reversal symmetry is vital for valley manipulation. This has been realized by directly applying magnetic fields or via pseudo …
WebApr 30, 2014 · The optical orientation of excitonic valley pseudospin can be represented using the Bloch sphere ( Fig. 3g–i ), where the poles correspond to valley polarization and … http://www.alessandrostroppa.com/full-list
WebJul 9, 2014 · In transition metal dichalcogenides this valley pseudo-spin, like real spin, is associated with a magnetic moment which underlies the valley-dependent circular dichroism that allows optical generation of valley polarization, intervalley quantum coherence, and the valley Hall effect. WebMar 2, 2024 · We have explored the electronic properties and the valley physics of 2D WSe2/CrI3 using first-principles calculations. Our results show that a valley splitting of 2 …
WebMar 2, 2024 · Removing valley degeneracy is a necessary condition for manipulating valley degrees of freedom and storing information in future spintronics. Magnetic proximity effect has been demonstrated to be an effective way to introduce exchange interactions, especially in the case of two-dimensional (2D) van der Waals (vdW) heterostructures. We have …
WebNov 24, 2024 · A variety of strategies have been developed to address the valley pseudospin including optical, electrical, and magnetic methods; nonetheless, they involve either below liquid-nitrogen temperature or an external magnetic field, which increases the cost and complexity of the devices. granny clampett thanksgiving dinner menuWebJul 26, 2024 · Here, we show valley-selective control of polariton energies in WS 2 using the optical Stark effect, extending coherent valley manipulation to the hybrid light-matter regime. Ultrafast pump-probe measurements reveal polariton spectra with strong polarization contrast originating from valley-selective energy shifts. chinook upholstery drapery and flooringWebOct 14, 2024 · Thus, the spin-valley locking and the interplay of two inequivalent valleys give rise to valley-dependent optical selection rules [17]. Manipulation of valley pseudospin thus becomes a central theme in the eld of valleytronics. Several methods have been proposed to achieve transient valley polarization such as optical excitations [18{20], by granny clampett with a gungranny clampett with shotgunWebJun 24, 2024 · The valley band topology and valley-contrasting physics described earlier serve as the basis for various phenomena and applications in both electronic valley materials and photonic valley systems. These nice properties point to the fact that valley is a powerful DOF that can be used for the manipulation of electromagnetic waves with ... chinook valley golf courseWebSep 19, 2016 · In this paper, we demonstrate all-optical control of the valley coherence by means of the pseudomagnetic field associated with the optical Stark effect. Using below … granny clare\u0027s citrus harlingen txWebMay 14, 2024 · The valley manipulation is realized via the optical control of the CrI 3 magnetization, which tunes the magnetic exchange field over a range of 20 T. Our results … granny clampett boots