Move aside, electrons; It's time to make room for the Trion.
A research team led by physicists at the University of California, Riverside, has observed, characterized and controlled dark trions in a semiconductor ̵
In a semiconductor such as WSe 2 a trion is a quantum bound state of three charged particles: a negative trion contains two electrons and a hole containing a positive trion a hole is the vacancy of an electron in a semiconductor that behaves like a positively charged particle.As a trion contains three interacting particles, it can carry much more information than a single electron.
Most Today, electronic devices use individual electrons to conduct electricity d to transmit information. Since triads carry a net electric charge, their movement can be controlled by an electric field. Triones can therefore also be used as information carriers. Compared to single electrons, trionene has controllable spin and momentum indices and a rich internal structure that can be used to encode information.
Trions can be classified into light and dark trions with different spin configurations. A bright trion contains an electron and a hole with opposite spins. A dark trion contains an electron and a hole with the same spin. Bright trions combine strongly with light and emit light efficiently, meaning that they decay quickly. However, dark trions couple weakly to light, which means that they decay much more slowly than bright trions.
The researchers measured the lifespan of dark trions and found that they last more than 100 times longer than the more abundant bright trions. The long life allows the transmission of information by triones over a much greater distance.
"Our work enables writing and reading of trion information by light," said Chun Hung (Joshua) Lui, assistant professor of physics and astronomy at UC Riverside, who led the research. "We can create two types of trions – dark and light trions – and control how information is encoded in them."
The results of the research are published in the journal Physical Review Letters .
"Our findings could open up new ways of transmitting information," said Erfu Liu, the first author of the research paper and postdoctoral researcher in Luis Labor. "Dark trionics with their long lifetimes can help us to realize the transmission of information through triones, as well as increasing the WLAN bandwidth at home, allowing more information to be transmitted through the transmission of trionene than through single electrons."
The researchers used a single layer of WSe 2 atoms resembling a graphene layer because the dark Trion energy level in WSe 2 is below the bright Trion energy level. The dark triones can therefore accumulate a large population and make their discovery possible.
Lui explained that most trion research today focuses on bright trions, as they emit so much light and are easily measured.
"However, we focus on dark triones and their detailed behavior under different charge densities in single-layer WSe 2 devices," said Lui. "We were able to demonstrate continuous tuning from positive to negative dark trions by simply setting an external voltage, and we also confirmed the different spin configuration of dark trions of bright trions."
"If we can use trions up to when we submit information , our information technology is greatly enriched, "he added. The main obstacle to such a development was the short lifespan of the bright trions. Now, the long-lived Dark Trions can help us overcome this obstacle.
Next, his team plans to demonstrate the actual transport of information through dark Trion.
"We intend to demonstrate the first implement that uses dark Trions to carry information," Lui said. When such a prototype Trion device works, dark trions can be used to carry quantum information. "
Future electronics may be based on new three-in-one particles
Erfu Liu et al. Gate tunable dark trions in monolayer WSe2, Physical Review Letters (2019). DOI: 10.1103 / PhysRevLett.123.027401
Physicists' findings could revolutionize the transmission of information (2019, 9 July)
retrieved on July 9, 2019
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