Quantum metasurfaces with atom arrays

Bekenstein, Rivka; Pikovski, Igor; Pichler, Hannes; Shahmoon, Ephraim; Yelin, Susanne F.; Lukin, Mikhail D.

doi:10.1038/s41567-020-0845-5

Cited by 130 publications

(98 citation statements)

References 49 publications

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“…Our evidence is multifold. Firstly, we observe photocurrents over a wide range of hBN thicknesses (3-90 nm in our devices) and, secondly, when deconvolved from optical doping ( Supplementary Figures [4][5][6], it is spatially uniform throughout all devicesas verified via spatially scanning the excitation beam and by verification using split gate devices. Such uniformity and thickness independence make alternative explanations such as dielectric breakdown or tunneling via in-gap defect states in the hBN unlikely.…”

Section: Introductionmentioning

confidence: 56%

“…As van der Waals (vdW) 2D materials, TMDs can be incorporated into complex, high cleanliness vdW heterostructures tailored to a myriad of possible applications [3]. In particular, such systems can be used to isolate and manipulate electronic and excitonic excitations which allow the creation of engineered, controlled quantum systems [4,5]. In general, such heterostructures rely on hexagonal boron-nitride (hBN) [6] as an atomically clean dielectric encapsulation layer to separate the active materials from each other, surrounding electrostatic gates, and the environment [7].…”

Section: Introductionmentioning

confidence: 99%

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Asymmetric photoelectric effect: Auger-assisted hot hole photocurrents in transition metal dichalcogenides

et al. 2020

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Transition metal dichalcogenide (TMD) semiconductor heterostructures are actively explored as a new platform for quantum optoelectronic systems. Most state of the art devices make use of insulating hexagonal boron nitride (hBN) that acts as a wide-bandgap dielectric encapsulating layer that also provides an atomically smooth and clean interface that is paramount for proper device operation. We report the observation of large, through-hBN photocurrents that are generated upon optical excitation of hBN encapsulated MoSe2 and WSe2 monolayer devices. We attribute these effects to Auger recombination in the TMDs, in combination with an asymmetric band offset between the TMD and the hBN. We present experimental investigation of these effects and compare our observations with detailed, ab-initio modeling. Our observations have important implications for the design of optoelectronic devices based on encapsulated TMD devices. In systems where precise charge-state control is desired, the out-of-plane current path presents both a challenge and an opportunity for optical doping control. Since the current directly depends on Auger recombination, it can act as a local, direct probe of both the efficiency of the Auger process as well as its dependence on the local density of states in integrated devices.

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Section: Introductionmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Asymmetric photoelectric effect: Auger-assisted hot hole photocurrents in transition metal dichalcogenides

et al. 2020

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“…For example, a metal-dielectric layered quantum well can boost giant optical nonlinearity with power efficiency of SHG reaching 10 −4 at an incident pulse intensity of 10 GW/cm 2 ( Qian et al., 2019 ). New physical principles will dominate when the geometric size of the resonators is small enough ( Bekenstein et al., 2020 ). Although the fabrications techniques nowadays limit the realization of metasurfaces on an extreme size, the underneath intriguing physics will promote more and more researchers to open up the new era.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, researchers also developed a method to directly shape the near-field landscapes of EM waves from far-field with metasurfaces in the microwave region ( Ginis et al., 2020 ). Based on the efficient manipulation of optical fields with nanostructures, metasurfaces have also been demonstrated to be a promising platform for imaging systems ( Aieta et al., 2012 ; Engelberg and Levy, 2020 ), holography ( Huang et al., 2015 ; Wen et al., 2015 ), and quantum applications ( Bekenstein et al., 2020 ; Stav et al., 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Dielectric Resonance-Based Optical Metasurfaces: From Fundamentals to Applications

Liu

Cheng

et al. 2020

iScience

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“…Nanophotonics and quantum have been a natural match as one of the key strengths of nanophotonic elements is to concentrate light and enhance light-matter interaction for quantum objects [139][140][141] and overcome quantum decoherence [142]. Now, new types of metasurfaces are being developed that can control quantum properties of emitted, transmitted, and reflected light [143][144][145][146][147][148]. Further development requires emitting materials with large oscillator strengths and related radiative decay rates that well exceed nonradiative and pure dephasing decay rates.…”

Section: Open Challenges and Opportunities For Metasurfacesmentioning

confidence: 99%

The road to atomically thin metasurface optics

Brongersma

2020

Nanophotonics

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The development of flat optics has taken the world by storm. The initial mission was to try and replace conventional optical elements by thinner, lightweight equivalents. However, while developing this technology and learning about its strengths and limitations, researchers have identified a myriad of exciting new opportunities. It is therefore a great moment to explore where flat optics can really make a difference and what materials and building blocks are needed to make further progress. Building on its strengths, flat optics is bound to impact computational imaging, active wavefront manipulation, ultrafast spatiotemporal control of light, quantum communications, thermal emission management, novel display technologies, and sensing. In parallel with the development of flat optics, we have witnessed an incredible progress in the large-area synthesis and physical understanding of atomically thin, two-dimensional (2D) quantum materials. Given that these materials bring a wealth of unique physical properties and feature the same dimensionality as planar optical elements, they appear to have exactly what it takes to develop the next generation of high-performance flat optics.

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Quantum metasurfaces with atom arrays

Cited by 130 publications

References 49 publications

Asymmetric photoelectric effect: Auger-assisted hot hole photocurrents in transition metal dichalcogenides

Asymmetric photoelectric effect: Auger-assisted hot hole photocurrents in transition metal dichalcogenides

Dielectric Resonance-Based Optical Metasurfaces: From Fundamentals to Applications

The road to atomically thin metasurface optics

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