Exotic conductors from lab and nature

Merali, Zeeya

doi:10.1038/495153a

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…The discovery of graphene boosted research in nanoscience on 2D materials, especially on elemental ones. In 2012, silicene, graphene's silicon cousin [1], was successfully synthesized on two metallic templates, namely a silver (111) surface [2,3] and the zirconium diboride (0001) surface of a thin film grown on a silicon (111) substrate [4]. One year later, silicene was also grown on an iridium (111) surface [5].…”

Section: Introductionmentioning

confidence: 99%

Germanene: a novel two-dimensional germanium allotrope akin to graphene and silicene

et al. 2014

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We have grown an atom-thin, ordered, two-dimensional multi-phase film in situ through germanium molecular beam epitaxy using a gold (111) surface as a substrate. Its growth is similar to the formation of silicene layers on silver (111) templates. One of the phases, forming large domains, as observed in scanning tunneling microscopy, shows a clear, nearly flat, honeycomb structure. Thanks to thorough synchrotron radiation core-level spectroscopy measurements and advanced density functional theory calculations we can identify it as a √3 × √3 R(30°) germanene layer in conjunction with a √7 × √7 R(19.1°) Au(111) supercell, presenting compelling evidence of the synthesis of the germaniumbased cousin of graphene on gold.S Online supplementary data available from stacks.iop.org/NJP/16/095002/ mmedia

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Section: Introductionmentioning

confidence: 99%

Germanene: a novel two-dimensional germanium allotrope akin to graphene and silicene

et al. 2014

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“…However, the MOSFET's aggressive scaling governed by Moore's law in the past few decades is approaching its final years because of the technical and fundamental limitations of Si-based materials such as shortchannel effects [1,2]. Hence, monolayer novel materials such as graphene, silicene [3] and germanene [4] have attracted much attention due to their inimitable electronic and optical properties and potential applications in future nanoelectronics [5]. These materials have a two-dimensional (2D) honeycomb crystal lattice for which the constituent atoms belong to the group IV.…”

Section: Introductionmentioning

confidence: 99%

Germanene nanoribbon tunneling field effect transistor (GeNR-TFET) with a 10 nm channel length: analog performance, doping and temperature effects

Bayani

Dideban

Vali

et al. 2016

Semicond. Sci. Technol.

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In this paper, a scheme of the germanene nanoribbon tunneling field effect transistor (GeNR-TFET) is proposed. The characteristics and analog performance of the device were theoretically investigated by exploiting the electrical properties of a germanene nanoribbon and applying the doping concentration in the source and drain regions at 300 K and 4 K temperatures. The device parameters were obtained using a non-equilibrium Green's function (NEGF) method within the tight binding (TB) Hamiltonian. The TB Hamiltonian was extracted from the density functional theory (DFT) through the Wannier function. We find that by increasing the doping concentration the I on current increases which leads to an improvement of the I on /I off ratio to 10 5 . Moreover, decreasing the temperature from 300 K to 4 K causes the I off to becometen times smaller. We find that the device output characteristic displays a negative differential conductance with a good peak-to-valley ratio which is improved by increasing the doping concentration. The analog performance of the device is also investigated in the subthreshold regime of operation by varying the doping concentration. It is observed that by increasing the device doping concentration, the analog figures of merit can be improved.

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“…Considerable excitement has followed a recent suggestion that "the only solution" of the paradox may be given by a Planck-scale (size, density) "firewall" that should form, as it was claimed, at the black hole horizon due to both (a) infinite blueshift of the Hawking radiation photons and (b) their quantum entanglement 2 . It was also claimed [9,11] that the firewall would burn up any in-falling object at the horizon. We will not discuss the issue of the quantum firewalls here.…”

Section: Introductionmentioning

confidence: 99%

Cosmic background radiation in the vicinity of a Schwarzschild black hole: No classic firewall

et al. 2014

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The Cosmic Blackbody Background Radiation pervades the entire Universe, and so falls into every astrophysical black hole. The blueshift of the infalling photons, measured by a static observer, is infinite at the event horizon. This raises a question as to whether a "firewall" of high energy density may form just outside the horizon, or whether the effect can be attributed exclusively to a singular behavior of the static observer's frame at the horizon. In principle, the presence of such firewall may alter the motion of the infalling matter, influence the black hole evolution, or even invalidate the vacuum Einstein field equation solution as a realistic approximation for black holes. In this paper we show by means of analytic calculations that all these effects indeed exist, but their magnitude is typically negligibly small, even though the matter stress tensor is divergent in the static frame at r = 2M . That is not surprising because of the divergent relation of that frame to a freely falling frame as r → 2M ; however it represents a kind of classical analogue for the Black Hole Complementarity principle that has been proposed for quantum effects near a black hole. What is perhaps more surprising is the divergence of the radiation stress tensor for massive particles moving on circular geodesic orbits for values of r approaching r = 3M . However such orbits will not occur for infalling matter in realistic accretion discs.

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Exotic conductors from lab and nature

Cited by 4 publications

References 5 publications

Germanene: a novel two-dimensional germanium allotrope akin to graphene and silicene

Germanene: a novel two-dimensional germanium allotrope akin to graphene and silicene

Germanene nanoribbon tunneling field effect transistor (GeNR-TFET) with a 10 nm channel length: analog performance, doping and temperature effects

Cosmic background radiation in the vicinity of a Schwarzschild black hole: No classic firewall

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