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Two-dimensional hybrid metal halide device allows control of terahertz emissions

by TimesOfNation
October 2, 2021
in Physics
Two-dimensional hybrid metal halide device allows control of terahertz emissions
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Researchers have utilized two-dimensional hybrid metal halides in a device that allows directional control of terahertz radiation generated by a spintronic scheme. The device has better signal efficiency than conventional terahertz generators, and is thinner, lighter and less expensive to produce.

Terahertz (THz) refers to the part of the electromagnetic spectrum (i.e., frequencies between 100 GHz and 10 THz) between microwave and optical, and THz technologies have shown promise for applications ranging from faster computing and communications to sensitive detection equipment. However, creating reliable THz devices has been challenging due to their size, cost and energy conversion inefficiency.

“Ideally, THz devices of the future should be lightweight, low-cost and robust, but that has been difficult to achieve with current materials,” says Dali Sun, assistant professor of physics at North Carolina State University and co-corresponding author of the work. “In this work, we found that a 2D hybrid metal halide commonly used in solar cells and diodes, in conjunction with spintronics, may meet several of these requirements.”

The 2D hybrid metal halide in question is a popular and commercially available synthetic hybrid semiconductor- butyl ammonium lead iodine. Spintronics refers to controlling the spin of an electron, rather than just using its charge, in order to create energy.

Sun and colleagues from Argonne National Laboratories, the University of North Carolina at Chapel Hill and Oakland University created a device that layered the 2D hybrid metal halides with a ferromagnetic metal, then excited it with a laser, creating an ultrafast spin current that in turn generated THz radiation.

The team found that not only did the 2D hybrid metal halide device outperform larger, heavier and more expensive to produce THz emitters currently in use, they also found that the 2D hybrid metal halide’s properties allowed them to control the direction of the THz transmission.

“Traditional terahertz transmitters were based upon ultrafast photocurrent,” Sun says. “But spintronic-generated emissions produce a wider bandwidth of THz frequency, and the direction of the THz emission can be controlled by modifying the speed of the laser pulse and the direction of the magnetic field, which in turn affects the interaction of magnons, photons, and spins and allows us directional control.”

Sun believes that this work could be a first step in exploring 2D hybrid metal halide materials generally as potentially useful in other spintronic applications.

“The 2D hybrid metal halide-based device used here is smaller and more economical to produce, is robust and works well at higher temperatures,” Sun says. “This suggests that 2D hybrid metal halide materials may prove superior to the current conventional semiconductor materials for THz applications, which require sophisticated deposition approaches that are more susceptible to defects.

“We hope that our research will launch a promising testbed for designing a wide variety of low-dimensional hybrid metal halide materials for future solution-based spintronic and spin-optoelectronic applications.”

The work appears in Nature Communications and is supported by the National Science Foundation under grant ECCS-1933297. Postdoctoral researcher Kankan Cong of Argonne National Laboratory, former NC State graduate student Eric Vetter of North Carolina State University, and postdoctoral researcher Liang Yan of UNC-CH are co-first authors. Haiden Wen, physicist at Argonne National Laboratory, Wei You, professor of chemistry at UNC-CH and Wei Zhang, associate professor at Oakland University, are co-corresponding authors of the research.

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Materials provided by North Carolina State University. Original written by Tracey Peake. Note- Content may be edited for style and length.

(News Source -Except for the headline, this story has not been edited by Times Of Nation staff and is published from a www.sciencedaily.com feed.)

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