The key to creating a quantum box was the use of a “small” two-dimensional material (disulfate
Physicists were able to demonstrate that polaritons,which are formed anywhere outside the quantum box can travel many micrometers, linger and accumulate inside it.” The discovery will provide ultra-energy-efficient and high-performance technologies for the future.
Exciton-polaritons are a promising platform for future ultra-low energy electronics. The point is that they can flow without loss of energy in a fully coherent quantum state.
New atomically thin two-dimensional semiconductors(atomically-thin semiconductors, TMDCs) are promising candidates for future technologies because the excitons in such materials are stable at room temperature. Operating under such conditions is important in any viable alternative low-power technology so that the energy required to supercool the device is profitable.
The problem is that transfer without dissipationrequires a phase transition to a macroscopically coherent quantum state. It occurs only at very high particle densities, which is difficult to achieve in two-dimensional semiconductors. “The new technique allows ANU researchers to create high-density polaritons in an engineering ‘quantum box,’” the scientists explain.
Researchers have found a new way to create"quantum box" mechanically, without the need for nanofabrication machines that expose fragile 2D materials to hot and abrasive particles.
Microscopic image showing a smaller WS₂ layer on top of a larger WS₂ layer separated by Ga₂O₃. Photo: FLEET
They placed a "small" monolayer of TMDCstungsten disulfide (WS₂) on top of a “large” WS₂ monolayer separated by ultra-thin Ga₂O₃ glass, inside a mirror microcavity. In such a device, excitons in a two-dimensional semiconductor can interact strongly with confined light to form exciton-polaritons (often called simply “polaritons”).
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