Reviewing the quantum material 'engine room'

Date:
September 16, 2020
Source:
ARC Centre of Excellence in Future Low-Energy Electronics
Technologies
Summary:
An Australian collaboration reviews the quantum anomalous Hall
effect (QAHE), one of the most fascinating and important recent
discoveries in condensed-matter physics. QAHE allows zero-resistance
electrical 'edge paths' in emerging quantum materials such as
topological insulators, opening great potential for ultra-low
energy electronics.



FULL STORY ==========================================================================
An Australian collaboration has reviewed the fundamental theories
underpinning the quantum anomalous Hall effect (QAHE).


==========================================================================
QAHE is one of the most fascinating and important recent discoveries in condensed-matter physics.

It is key to the function of emerging 'quantum' materials, which offer potential for ultra-low energy electronics.

QAHE causes the flow of zero-resistance electrical current along the
edges of a material.

QAHE IN TOPOLOGICAL MATERIALS: KEY TO LOW-ENERGY ELECTRONICS Topological insulators, recognised by the Nobel Prize in Physics in 2016, are based
on a quantum effect known as the quantum anomalous Hall effect (QAHE).



========================================================================== "Topological insulators conduct electricity only along their edges,
where one- way 'edge paths' conducts electrons without the scattering
that causes dissipation and heat in conventional materials," explains
lead author Muhammad Nadeem.

QAHE was first proposed by 2016 Nobel-recipient Prof Duncan Haldane (Manchester) in the 1980s, but it subsequently proved challenging to
realize QAHE in real materials. Magnetic-doped topological insulators
and spin-gapless semiconductors are the two best candidates for QAHE.

It's an area of great interest for technologists," explains Xiaolin
Wang. "They are interested in using this significant reduction in
resistance to significantly reduce the power consumption in electronic devices." "We hope this study will shed light on the fundamental
theoretical perspectives of quantum anomalous Hall materials," says
co-author Prof Michael Fuhrer (Monash University), who is Director
of FLEET.

THE STUDY The collaborative, theoretical study concentrates on these
two mechanisms:
* large spin-orbit coupling (interaction between electrons'
movement and
their spin)
* strong intrinsic magnetization (ferromagnetism)
The study was supported by the Australian Research Council (Centres of Excellence and Future Fellowship projects).


========================================================================== Story Source: Materials provided by ARC_Centre_of_Excellence_in_Future_Low-Energy_Electronics
Technologies. Note: Content may be edited for style and length.


========================================================================== Journal Reference:
1. Muhammad Nadeem, Alex R. Hamilton, Michael S. Fuhrer, Xiaolin Wang.

Quantum Anomalous Hall Effect in Magnetic Doped Topological
Insulators and Ferromagnetic Spin‐Gapless Semiconductors--A
Perspective Review. Small, 2020 DOI: 10.1002/smll.201904322 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/09/200916094235.htm

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