Optical recombination of biexcitons in semiconductors

Bauer, Marianne; Keeling, Jonathan; Parish, Meera M.; Ríos, Pablo López; Littlewood, P. B.

doi:10.1103/physrevb.87.035302

Cited by 16 publications

(17 citation statements)

References 72 publications

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“…After the first experimental verification of YSR states of individual atoms using STS (Yazdani et al, 1997), numerous experimental studies have been performed, revealing effects due to the orbital structure of the atoms (Choi et al, 2017b;Ji et al, 2008;Ruby, 2016), due to the magnetic anisotropy of the atom (Hatter et al, 2015), due to a reduced dimensionality of some superconductors (Ménard et al, 2015), due to the competition between Kondo screening and Cooper pairing (Bauer et al, 2013;Franke et al, 2011), and due to the spinpolarization of the YSR state (Cornils et al, 2017). Because of the orbital structure of the magnetic atom, there are spatial variations of the exchange field produced by the atom, which induce a marked shape of the spatial distribution of the YSR state.…”

Section: B Spin Chains On Superconducting Substratesmentioning

confidence: 99%

Colloquium: Atomic spin chains on surfaces

et al. 2019

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Magnetism at low dimensions is a thriving field of research with exciting opportunities in technology. In the present Colloquium, we focus on the properties of 1-D magnetic systems on solid surfaces. From the emulation of 1-D quantum phases to the potential realization of Majorana edge states, spin chains are unique systems to study. The advent of scanning tunnelling microscope (STM) based techniques has permitted us to engineer spin chains in an atom-by-atom fashion via atom manipulation and to access their spin states on the ultimate atomic scale. Here, we present the current state of research on spin correlations and dynamics of atomic spin chains as studied by the STM. After a brief review of the main properties of spin chains on solid surfaces, we classify spin chains according to the coupling of their magnetic moments with the holding substrate. This classification scheme takes into account that the nature and lifetimes of the spinchain excitation intrinsically depend on the holding substrate. We first show the interest of using insulating layers on metals, which generally results in an increase in the spin state's lifetimes such that their quantized nature gets evident and they are individually accessible. Next, we show that the use of semiconductor substrates promises additional control through the tunable electron density via doping. When the coupling to the substrate is increased for spin chains on metals, the substrate conduction electron mediated interactions can lead to emergent exotic phases of the coupled spin chain-substrate conduction electron system. A particularly interesting example is furnished by superconductors. Magnetic impurities induce states in the superconducting gap. Due to the extended nature of the spin chain, the in-gap states develop into bands that can lead to the emergence of 1-D topological superconductivity and, consequently to the appearance of Majorana edge states. Finally, we give an outlook on the use of spin chains in spintronics, quantum communication, quantum computing, quantum simulations and quantum sensors.

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Section: B Spin Chains On Superconducting Substratesmentioning

confidence: 99%

Colloquium: Atomic spin chains on surfaces

et al. 2019

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“…[35,36]) and the interplay between Kondo screening and Cooper pairing (see Ref. [37] and works cited therein) is beyond the scope of the present work, as its primary aim has been to demonstrate the importance of e − e interactions in quenching the superfluid density in copper oxides. In what follows, we focus on the role of magnetic effects in the profound change of the dirty-limit linear relation (24) between the superfluid density ρ s0 (x) and the gap value ∆ 0 (x), which prevails over a substantial portion of the LSCO phase diagram, but yields to bilinear behavior, ρ so ∝ ∆ 2 0 , near the critical doping x c at which superconductivity terminates.…”

Section: Iiib Impact Of Paramagnetic Impurities On the Relation Betwmentioning

confidence: 98%

Impact of electron-electron interactions on the superfluid density of dirty superconductors

2019

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Landau's theory of the Fermi liquid is adapted to analyze the impact of electron-electron (e − e) interactions on the deficit of the superfluid density ρs0 = ρs(T = 0) in dirty superconducting electron systems in which the damping γ of single-particle excitations exceeds the zero temperature BCS gap ∆0. In the dirty strong-coupling limit γ/∆0 ≫ 1, m * /me ≫ 1, the formula derived for ρs0 is shown to coincide with the well-known empirical Uemura relation provided pair-breaking contributions are nonexistent. The roles of the crystal lattice and magnetic pair-breaking effects in the observed decline of the zero-temperature superfluid density ρs0 in overdoped LSCO compounds are also discussed. Our method is also applied to elucidation of results from the pioneering experimental studies performed recently by Bozovic and collaborators in overdoped LSCO compounds.

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“…One issue is that even if one has a good representation of the Eliashberg function, the actual value of T c is suppressed due to Coulomb effects [14]. The calculation of this repulsive µ is on much less firm ground than the attractive electron-ion interaction, though recent progress has been made [15].…”

Section: Materials Genome Ideas Applied To Superconductorsmentioning

confidence: 99%

Materials design for new superconductors

Norman

2016

Rep. Prog. Phys.

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Since the announcement in 2011 of the Materials Genome Initiative by the Obama administration, much attention has been given to the subject of materials design to accelerate the discovery of new materials that could have technological implications. Although having its biggest impact for more applied materials like batteries, there is increasing interest in applying these ideas to predict new superconductors. This is obviously a challenge, given that superconductivity is a many body phenomenon, with whole classes of known superconductors lacking a quantitative theory. Given this caveat, various efforts to formulate materials design principles for superconductors are reviewed here, with a focus on surveying the periodic table in an attempt to identify cuprate analogues.

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Optical recombination of biexcitons in semiconductors

Cited by 16 publications

References 72 publications

Colloquium: Atomic spin chains on surfaces

Colloquium: Atomic spin chains on surfaces

Impact of electron-electron interactions on the superfluid density of dirty superconductors

Materials design for new superconductors

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