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A New Generation Of Electronics
Oct 28, 2017



A new method to accurately detect electronic magnetism and exotic behaviour on the surface of quantummaterials is expected to open up new avenues for next-generation electronic devices.

The core of today's electronic devices - silicon - based semiconductors,Silicon-based semiconductors rely on controlled currents during their operations and gain the energy they carry with them.

However, in addition to the charge, the electron also has an intrinsic property - spin, the spin angular momentum.
Spin is one of the characteristics of quantum materials, which is elusive but can be regulated to enhance the performance of electronic devices.

The new quantum material may lead a new generation of electronics
Recently, a team led by an-ping Li of oak ridge national laboratory developed a novel microscopy technique to detect electron spin in topological insulators.

The new quantum material being detected will be used in fields such as spin electronics and quantum computing.
Li said: "spin current, the total angular momentum of the motion electron, is a behavior in the topology insulator, which has been unable to be calculated until there is a method of sensing spin."

With the development of electronic devices, we need to put more energy into smaller components.
And that has led to a new generation of gadgets that are cheaper and more energy-efficient to replace rechargeable electronic devices.

Topological insulator is characterized by its surface carrying current, while in the body, it is an insulator.
At the same time, when the electron flows through the surface of the topology insulator, the spin direction shows consistency, unlike the electron spin in the semiconductor is random.

Li added: "charging based devices have lower energy efficiency than spin-based devices.So spin is useful, we need to control their flow and direction."


Tu is a new microscopy method developed by a team of researchers at oak ridge national laboratory.
The scanning tunneling microscope (STM) of this method has four movable probes, which can detect the spin of the electrons and provide high resolution results.

Using this method, the researchers observed the spin on the surface of the quantum material.
To detect and better understand the peculiar behavior of particles, the team needed to develop a way to detect the spin of the motor's electrons.

Them with a new microscope method for single crystal containing bismuth, tellurium and selenium Bi2Te2Se (a topological insulator) was tested and measured by the electrons move between a specific point in the material surface and induction voltage to the voltage of each electron spin.

This new method is based on a four point probe scanning tunneling microscope (STM), the microscope can use four mobile probe to determine the atomic activity (a) decay rate of materials, and adding a component to the device after you can observe the spin behavior of electrons in the material surface.

This method not only have the spin sensitivity measurement, it also limit current to the surface of a small area, to help prevent electrons escape from the surface, thus provides the result of the high resolution.