Sodium: a charge-transfer insulator at high pressures.

@article{Gatti2010SodiumAC,
  title={Sodium: a charge-transfer insulator at high pressures.},
  author={Matteo Gatti and Ilya V. Tokatly and {\'A}ngel Rubio},
  journal={Physical review letters},
  year={2010},
  volume={104 21},
  pages={
          216404
        }
}
By first-principles methods we analyze the optical response of transparent dense sodium as a function of applied pressure. We discover an unusual kind of charge-transfer exciton that proceeds from the interstitial distribution of valence electrons. The absorption spectrum is strongly anisotropic, which, just at pressures above the metal-insulator transition, manifests as sodium being optically transparent in one direction but reflective in the other. This result provides key information about… 

Figures and Tables from this paper

Exotic high pressure behavior of light alkali metals, lithium and sodium
Abstract At ambient conditions, lithium and sodium behave as free-electron metals and adopt highly symmetric close-packed structures. Under high pressure, however, these simple metals undergo a
Optical properties of dense lithium in electride phases by first-principles calculations
TLDR
The dynamic dielectric response and optical properties of the high-pressure electride phases of cI16, oC40 and oC24 in lithium spanning a wide pressure range from 40 to 200 GPa by first-principles calculations are reported, revealing diversity and rich physics in electrides.
Quasimolecules in Compressed Lithium.
TLDR
The quasimolecule concept provides a simple chemical perspective on the unusual insulating behavior of such materials, complementing the physical picture previously presented where the global crystal symmetry of the system plays the major role.
High-pressure electrides: the chemical nature of interstitial quasiatoms.
TLDR
The computed Mg electride is used to understand metallic bonding in one class of electrides, and in general, the space confined between atoms in a high pressure environment offers up quantized states to electrons.
Predicted Pressure-Induced Superconducting Transition in Electride Li_{6}P.
TLDR
It is reported that a pressure-induced stable Li_{6}P electride, identified by first-principles swarm structure calculations, becomes a superconductor with a predicted superconducting transition temperature T_{c} of 39.3 K, which is the highest among the already known electrides.
Structural Effects on Electronic Properties of Selected Materials
Tuning structural properties, e.g., by means of external pressure or applied uniaxial strain, can significantly modify the electronic properties of several solid systems, thereby influencing, or even
High-pressure electrides: From design to synthesis
Electrides are unique ionic compounds that electrons serve as the anions. Many electrides with fascinating physical and chemical properties have been discovered at ambient condition. Under pressure,
Is sodium a superconductor under high pressure?
TLDR
It is concluded that under high pressure-before the metal-to-insulator transition at 260 GPa-superconductivity in Na is very weak, if it is measurable at all.
Charge density wave in hydrogen at high pressure
We present extensive molecular dynamics (MD) simulations investigating numerous candidate crystal structures for hydrogen in conditions around the present experimental frontier (400 GPa). Spontaneous
High pressure electrides: a predictive chemical and physical theory.
TLDR
By using a He lattice model to compress (with minimal orbital interaction at moderate pressures between the surrounding He and the contained atoms or molecules) atoms and an interstitial space, this work is able to semiquantitatively explain and predict the propensity of various elements to form HPEs.
...
...

References

SHOWING 1-10 OF 32 REFERENCES
Solid-State Physics
These are a set of notes I have made, based on lectures given by M.Moore at the University of Manchester Jan-June ’08. Please e-mail me with any comments/corrections: jap@watering.co.uk.
Nature
  • R. Rosenfeld
  • Medicine
    Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery
  • 2009
疟原虫var基因转换速率变化导致抗原变异[英]/Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A
抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1(PfPMP1)与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用,在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员,通过启动转录不同的var基因变异体为抗原变异提供了分子基础。
Rev
  • Mod. Phys. 74, 601
  • 2002
Phys
  • Rev. Lett. 86, 2830
  • 2001
Pastori-Parravicini, Solid State Physics (Academic
  • New York,
  • 2000
Phys. Rev. Lett
  • Phys. Rev. Lett
  • 2001
and references therein
  • and references therein
  • 2002
Phys. Rev. Lett
  • Phys. Rev. Lett
  • 2008
Nature 458
  • 158 (2009); Proc. Natl. Acad. Sci. USA 105, 5
  • 2007
...
...