Shifting dimensions Excitons in unusual 2D material

Scientists have explored how an excited state of matter shifting dimensions excitons behave in phosphorene, a two-dimensional material that could be used in LEDs, solar cells, and other optoelectronic devices. The researchers found that they can control whether excitons interact in one or two dimensions within phosphorene, enhancing its prospects as a new material in optoelectronic devices.

Since its discovery in 2014, phosphorene — a sheet of phosphorus atoms only a single atom thick — has intrigued scientists, due to its unique optoelectronic anisotropy. In other words, electrons interact with light and move in one direction only. This anisotropy means that despite being two dimensional (2D), phosphorene shows a mix of properties found in both one-dimensional (1D) and 2D materials. Scientists believe that the distinct quasi-1D nature of phosphorene could be exploited to develop new, innovative optoelectronic devices, from LEDs to solar cells.

Now, scientists from the Femtosecond Spectroscopy Unit at the Okinawa Institute of Science and Technology Graduate University (OIST) have shed light on how excitons — an excited state of matter at the core of optoelectronics — move and interact within phosphorene.

“Because of the anisotropy, excitons behave in a really unique way in phosphorene compared to other 2D materials, which we are only just beginning to understand,” said Vivek Pareek, PhD student and first author of the study, published inĀ Physical Review Letters. Read the full article here.


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