72 Result(s)
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Sokrates T. Pantelides
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Open AccessPhonon-mediated temperature dependence of Er3+ optical transitions in Er2O3
Characterization of the atomic level processes that determine optical transitions in emerging materials is critical to the development of new platforms for classical and quantum networking. Such understanding ...
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Single-atom vibrational spectroscopy with chemical-bonding sensitivity
Correlation of lattice vibrational properties with local atomic configurations in materials is essential for elucidating functionalities that involve phonon transport in solids. Recent developments in vibratio...
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Open AccessEmergent ferromagnetism and insulator-metal transition in δ-doped ultrathin ruthenates
Heterostructures of complex transition metal oxides are known to induce extraordinary emergent quantum states that arise from broken symmetry and other discontinuities at interfaces. Here we report the emergen...
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Intrinsically patterned corrals in monolayer Ag5Se2 and selective molecular co-adsorption
Functionalized two-dimensional (2D) materials play an important role in both fundamental sciences and practical applications. The construction and precise control of patterns at the atomic-scale are necessary ...
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Open AccessEmergent interface vibrational structure of oxide superlattices
As the length scales of materials decrease, the heterogeneities associated with interfaces become almost as important as the surrounding materials. This has led to extensive studies of emergent electronic and ...
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Atomically sharp interface enabled ultrahigh-speed non-volatile memory devices
The development of high-performance memory devices has played a key role in the innovation of modern electronics. Non-volatile memory devices have manifested high capacity and mechanical reliability as a mains...
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Open AccessPiezoelectric domain walls in van der Waals antiferroelectric CuInP2Se6
Polar van der Waals chalcogenophosphates exhibit unique properties, such as negative electrostriction and multi-well ferrielectricity, and enable combining dielectric and 2D electronic materials. Using low tem...
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InSe/hBN/graphite heterostructure for high-performance 2D electronics and flexible electronics
Two-dimensional (2D) materials as channel materials provide a promising alternative route for future electronics and flexible electronics, but the device performance is affected by the quality of interface bet...
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Open AccessDetection of defects in atomic-resolution images of materials using cycle analysis
The automated detection of defects in high-angle annular dark-field Z-contrast (HAADF) scanning-transmission-electron microscopy (STEM) images has been a major challenge. Here, we report an approach for the autom...
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Tunable quadruple-well ferroelectric van der Waals crystals
The family of layered thio- and seleno-phosphates has gained attention as potential control dielectrics for the rapidly growing family of two-dimensional and quasi-two-dimensional electronic materials. Here we...
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Synthesis and properties of free-standing monolayer amorphous carbon
Bulk amorphous materials have been studied extensively and are widely used, yet their atomic arrangement remains an open issue. Although they are generally believed to be Zachariasen continuous random networks1, ...
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Open AccessInterface-induced magnetic polar metal phase in complex oxides
Polar metals are commonly defined as metals with polar structural distortions. Strict symmetry restrictions make them an extremely rare breed as the structural constraints favor insulating over metallic phase....
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Spectroscopic signatures of edge states in hexagonal boron nitride
We use Z-contrast imaging and atomically resolved electron energy-loss spectroscopy on an aberration-corrected scanning transmission electron microscope to investigate the local electronic states of boron atom...
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Open AccessSpatially and spectrally resolved orbital angular momentum interactions in plasmonic vortex generators
Understanding the near-field electromagnetic interactions that produce optical orbital angular momentum (OAM) is crucial for integrating twisted light into nanotechnology. Here, we examine the cathodoluminesce...
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Tuning the morphology of chevron-type graphene nanoribbons by choice of annealing temperature
Bottom-up synthesis of graphene nanoribbons (GNRs) by surface-assisted polymerization and cyclodehydrogenation of specifically designed precursor monomers has been shown to yield precise edges and do**. Here...
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Recovery of edge states of graphene nanoislands on an iridium substrate by silicon intercalation
Finite-sized graphene sheets, such as graphene nanoislands (GNIs), are promising candidates for practical applications in graphene-based nanoelectronics. GNIs with well-defined zigzag edges are predicted to ha...
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Sulfur-doped graphene nanoribbons with a sequence of distinct band gaps
Unlike graphene sheets, graphene nanoribbons (GNRs) can exhibit semiconducting band gap characteristics that can be tuned by controlling impurity do** and the GNR widths and edge structures. However, achievi...
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Open AccessFast kinetics of magnesium monochloride cations in interlayer-expanded titanium disulfide for magnesium rechargeable batteries
Magnesium rechargeable batteries potentially offer high-energy density, safety, and low cost due to the ability to employ divalent, dendrite-free, and earth-abundant magnesium metal anode. Despite recent progr...
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Open AccessRoom-temperature ferroelectricity in CuInP2S6 ultrathin flakes
Two-dimensional (2D) materials have emerged as promising candidates for various optoelectronic applications based on their diverse electronic properties, ranging from insulating to superconducting. However, co...
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Implantation and Diffusion of Silicon Marker Layers in In0.53Ga0.47As
Continued effort has been placed on maximizing activation while controlling the diffusion of silicon do** in InGaAs for present and future complementary metal-oxide semiconductor devices. In order to explore...
