New superlattice material for future energy efficient devices

Date:
August 17, 2020
Source:
Stony Brook University
Summary:
Physicists have created a new material layered by two structures,
forming a superlattice, that at a high temperature is a
super-efficient insulator conducting current without dissipation
and lost energy.



FULL STORY ==========================================================================
An international team of physicists including Jennifer Cano, PhD, of Stony Brook University, has created a new material layered by two structures,
forming a superlattice, that at a high temperature is a super-efficient insulator conducting current without dissipation and lost energy. The
finding, detailed in a paper published in Nature Physics, could be the
basis of research leading to new, better energy efficient electrical conductors.


==========================================================================
The material is created and developed in a laboratory chamber. Over time
atoms attach to it and the material appears to grow -- similar to the way
rock candy is formed. Surprisingly, it forms a novel ordered superlattice, which the researchers test for quantized electrical transport.

The research centers around the Quantum Anomalous Hall Effect (QAHE),
which describes an insulator that conducts dissipationless current in
discrete channels on its surfaces. Because QAHE current does not lose
energy as it travels, it is similar to a superconducting current and has
the potential if industrialized to improve energy-efficient technologies.

"The main advance of this work is a higher temperature QAHE in
a superlattice, and we show that this superlattice is highly tunable
through electron irradiation and thermal vacancy distribution, thus
presenting a tunable and more robust platform for the QAHE," says
Cano, Assistant Professor in the Department of Physics and Astronomy
in the College of Arts and Sciences at Stony Brook University and also
an Affiliate Associate Research Scientist at the Flatiron Institute's
Center for Computational Quantum Physics.

Cano and colleagues say they can advance this platform to other
topological magnets. The ultimate goal would be to help transform future quantum electronics with the material.

The collaborative research is led by City College of New York under
the direction of Lia Krusin-Elbaum, PhD. The research is supported in
part by the National Science Foundation (grant numbers DMR-1420634 and HRD-1547830).


========================================================================== Story Source: Materials provided by Stony_Brook_University. Note:
Content may be edited for style and length.


========================================================================== Journal Reference:
1. Haiming Deng, Zhiyi Chen, Agnieszka Wołoś, Marcin
Konczykowski,
Kamil Sobczak, Joanna Sitnicka, Irina V. Fedorchenko, Jolanta
Borysiuk, Tristan Heider, Łukasz Pluciński, Kyungwha Park,
Alexandru B.

Georgescu, Jennifer Cano, Lia Krusin-Elbaum. High-temperature
quantum anomalous Hall regime in a MnBi2Te4/Bi2Te3
superlattice. Nature Physics, 2020; DOI: 10.1038/s41567-020-0998-2 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/08/200817123103.htm

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