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Superconductivity could form at high temperatures in layered 2-D crystals

Date:
July 28, 2014
Source:
University of California - San Diego
Summary:
An elusive state of matter called superconductivity could be realized in stacks of sheetlike crystals just a few atoms thick, new analysis determined. Electrons and 'holes' would accumulate in separate layers of a 2D semiconductor compound in response to an electrical field forming a superfluid gas of indirect excitons. Counterflow superconductivity would result.

n elusive state of matter called superconductivity could be realized in stacks of sheetlike crystals just a few atoms thick, a trio of physicists has determined.

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Superconductivity, the flow of electrical current without resistance, is usually found in materials chilled to the most frigid temperatures, which is impractical for most applications. It's been observed at higher temperatures-higher being about 100 kelvin or minus 280 degrees below zero Fahrenheit-in copper oxide materials called cuprate superconductors. But those materials are brittle and unsuitable for fabricating devices like circuits.

In a paper published in Nature Communications the week of July 28, Michael Fogler and Leonid Butov, professors of physics at the University of California, San Diego, and Konstantin Novoselov, Nobel laureate in physics and professor at the University of Manchester, propose a design for an artificially structured material that should support superconductivity at temperatures rivaling those seen for cuprates.

They considered a material made by interleaving two different types of crystal, one a semiconductor compound and the other a type of insulator. Two one-atom thick layers of the semiconductor compound molybdenum disulfide would be separated by a few-atom thick spacer made of boron nitride, and surrounded by additional boron nitride cladding.

This sets up a situation in which electrons and "holes" left by a missing electrons would accumulate in separate layers of the semiconductor compound in response to an electrical field. And yet these separated electrons and holes would be bound, at a distance, in states called indirect excitons.

These indirect excitons would form a gas with vanishing viscosity. That is, below a certain temperature, the gas would become superfluid. The physicists determined that superfluidity of indirect excitons would set up countercurrents that would not dissipate, a phenomenon called counterflow superconductivity.

Superfluidity and superconductivity are macroscopic manifestations of quantum phenomena, which are usually seen at the smallest physical scales.

The proposed design is an initial blueprint, the authors write. Their analysis reveals a general principle for creating "coherent states" like superfluidity and superconductivity that would emerge in similar materials created with layers of other semiconductor compounds such as tungsten disulfide or tungsten diselenide as well.

Such van der Waals structures are the subject of many investigations; this new analysis demonstrates that they also provide a new platform for exploring fundamental quantum phenomena.

Practical uses are possible as well; these materials could be used to develop electronic and optoelectronic circuits.


Story Source:

The above story is based on materials provided by University of California - San Diego. Note: Materials may be edited for content and length.


Journal Reference:

  1. M. M. Fogler, L. V. Butov, K. S. Novoselov. High-temperature superfluidity with indirect excitons in van der Waals heterostructures. Nature Communications, 2014; 5 DOI: 10.1038/ncomms5555

Cite This Page:

University of California - San Diego. "Superconductivity could form at high temperatures in layered 2-D crystals." ScienceDaily. ScienceDaily, 28 July 2014. <www.sciencedaily.com/releases/2014/07/140728080554.htm>.
University of California - San Diego. (2014, July 28). Superconductivity could form at high temperatures in layered 2-D crystals. ScienceDaily. Retrieved November 28, 2014 from www.sciencedaily.com/releases/2014/07/140728080554.htm
University of California - San Diego. "Superconductivity could form at high temperatures in layered 2-D crystals." ScienceDaily. www.sciencedaily.com/releases/2014/07/140728080554.htm (accessed November 28, 2014).

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