Tunable room-temperature spin-selective optical Stark effect in solution-processed layered halide perovskites

Giovanni, David; Chong, Wee Kiang; Dewi, Herlina Arianita; Thirumal, Krishnamoorthy; Neogi, Ishita; Ramesh, R.; Mhaisalkar, Subodh; Mathews, Nripan; Sum, Tze Chien

doi:10.1126/sciadv.1600477

Cited by 129 publications

(195 citation statements)

References 37 publications

Supporting

Mentioning

184

Contrasting

Order By: Relevance

“…45,46 The organic component does not play a signicant role in determining the electronic structure. 41,47 The optical transitions in 2D perovskites thus stem from the 6s to 6p transition in Pb 2+ , which is similar to that in PbI 2 . Because Pb(207) has a larger atomic mass than I(126), the Pb atoms undergo Bose-Einstein oscillation at a low frequency that induces acoustic phonons, whereas the I atoms predominantly exhibit high-frequency Bose-Einstein oscillations, resulting in optical phonons.…”

Section: Resultsmentioning

confidence: 78%

Bose–Einstein oscillators and the excitation mechanism of free excitons in 2D layered organic–inorganic perovskites

Peng

et al. 2017

RSC Adv.

View full text Add to dashboard Cite

Following intense research on two-dimensional (2D) materials, there has been a resurgence of interest in 2D layered hybrid organic-inorganic perovskites. These 2D perovskites have direct band gaps regardless of their thickness. Excitons are confined to monolayers because of the materials' selforganized quantum-well electronic structure. Gaining insight into the exciton dynamics is central to understanding the light-matter interactions in 2D organic-inorganic perovskites. Herein, we investigate the free-exciton dynamics in 2D layered CH 3 (CH 2 ) 3 NH 3 PbI 4 perovskite, demonstrating an anomalous temperature variation of the photoluminescence (PL) energy, which deviates from the conventional Varshni formula and is consistent with the behaviour of Bose-Einstein oscillators. The acoustic phonons induced by the coherent lattice motion of the atoms result in a positive temperature variation. Two-pulse emission modulation measurements reveal the excitation mechanism of the strong two-photon PL in CH 3 (CH 2 ) 3 NH 3 PbI 4 perovskite, in which two photons are simultaneously absorbed through a virtual state.

show abstract

Section: Resultsmentioning

confidence: 78%

Bose–Einstein oscillators and the excitation mechanism of free excitons in 2D layered organic–inorganic perovskites

Peng

et al. 2017

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…When a semiconducting system is excited by a laser pulse with photon energy lower than that of exciton transition, a virtual optical transition is invoked resulting in so-called photon-dressed states12345678910111213141516. It usually interacts repulsively with original states, leading to the characteristic blue-shift of the exciton energy spectrum.…”

mentioning

confidence: 99%

“…It usually interacts repulsively with original states, leading to the characteristic blue-shift of the exciton energy spectrum. Along with the fact that the coherent interaction can only take place during the time duration of an ultra-short laser pulse, such a unique feature makes this phenomena, the so-called excitonic optical Stark effect, ideal for ultrafast optical switches and modulators34567891012131415161718. So far, however, there has been no strategy for energy-selective control of exciton states.…”

mentioning

confidence: 99%

Selectively tunable optical Stark effect of anisotropic excitons in atomically thin ReS2

et al. 2016

View full text Add to dashboard Cite

The optical Stark effect is a coherent light–matter interaction describing the modification of quantum states by non-resonant light illumination in atoms, solids and nanostructures. Researchers have strived to utilize this effect to control exciton states, aiming to realize ultra-high-speed optical switches and modulators. However, most studies have focused on the optical Stark effect of only the lowest exciton state due to lack of energy selectivity, resulting in low degree-of-freedom devices. Here, by applying a linearly polarized laser pulse to few-layer ReS2, where reduced symmetry leads to strong in-plane anisotropy of excitons, we control the optical Stark shift of two energetically separated exciton states. Especially, we selectively tune the Stark effect of an individual state with varying light polarization. This is possible because each state has a completely distinct dependence on light polarization due to different excitonic transition dipole moments. Our finding provides a methodology for energy-selective control of exciton states.

show abstract

“…Figure g shows the results obtained under co‐ and counter‐circularly polarized light conditions, which are consistent with the preceding discussion. In the same year, Giovanni et al also observed a strong Stark effect in HOPs . Circularly polarized pulses were used to select the spin states, tuning them by ≈6.3 meV, which provides the same effect as application of magnetic fields as large as 70 T. They also studied different kinds of 2D perovskite thin films that were processed using low‐temperature solutions.…”

Section: Novel Spin‐related Physical Effects Arising From Hopsmentioning

confidence: 99%

Section: Novel Spin‐related Physical Effects Arising From Hopsmentioning

confidence: 99%

Spintronics of Hybrid Organic–Inorganic Perovskites: Miraculous Basis of Integrated Optoelectronic Devices

Liao

Cheng

et al. 2019

Advanced Optical Materials

View full text Add to dashboard Cite

Hybrid organic–inorganic perovskite (HOP) spintronics aims to make full use of the properties of electron spin. HOP spintronics has recently emerged as a promising field of research because it provides a new precisely manipulable degree of freedom. The flourishing development activity in this field has benefited from the unique intrinsic spin‐related optoelectronic properties of HOPs, which include triplet formation, a large Stark effect, the magneto‐optical effect, polarized light‐related effects, and complex light emission characteristics, which offer the possibility of providing a new way to control the performance of integrated optoelectronic devices through spin interactions between photons and electrons. Along with the continuous improvements in the theoretical research into HOP spintronics, large numbers of novel optoelectronic devices have been proposed and demonstrated experimentally and have shown great potential for fabrication of next‐generation, high‐performance integrated optoelectronic chips. This review provides an overview of the fundamental principles, novel spin‐generated physical effects, and diverse structures of HOP spintronics systems, along with the applications of HOP spintronics in optoelectronic devices, while also undertaking a general review of the remaining challenges and proposing possible development directions that require further study for the application of HOP spintronics to integrated optoelectronic devices.

show abstract

Tunable room-temperature spin-selective optical Stark effect in solution-processed layered halide perovskites

Abstract: A new spin on perovskites untwined: Ultrafast optical switching and tuning of spin-energy states in layered halide perovskites.

Cited by 129 publications

References 37 publications

Bose–Einstein oscillators and the excitation mechanism of free excitons in 2D layered organic–inorganic perovskites

Bose–Einstein oscillators and the excitation mechanism of free excitons in 2D layered organic–inorganic perovskites

Selectively tunable optical Stark effect of anisotropic excitons in atomically thin ReS2

Spintronics of Hybrid Organic–Inorganic Perovskites: Miraculous Basis of Integrated Optoelectronic Devices

Contact Info

Product

Resources

About