Chiral Crystals

 


Chirality is an object that cannot be super imposed onto their mirror images. It doesn’t matter which combination, rotation or translation is used; it’s much like our right and left hand.

In Chile crystals, the arrangement of atoms makes a specific handedness. This factor can influence their electrical and optical properties.

A team at Hamburg Oxford is studying anti-ferro chirals. It is a type of non-chiral crystal that acts just like anti-ferromagnetic materials. Its magnetic moments anti-align in a vanishing net magnetization. Both types of chiral (right and left left-handed substructures) render it overall, non-chiral. 

Andrea Cavalleri From the max plank Institute for the structure and dynamics of matter is leading the research team. 

The scientists used terahertz light to change this balance in the non-chiral material boron phosphate. The team published their works in the journal Science.

Zheiyang Zheng Is lead author of this work. He reports, “ We exploit a mechanism termed, non-linear photonics. By exciting a specific terahertz frequency vibrational mode, which displays the crystal lattice along the coordinates of other modes in the material, we created a chiral state that survives for several pico seconds.”

Michael Forst Is a fellow author. He reports, “Notably, by rotating the polarization of the terahertz light by 90°, we could selectively induce either a left or right handed chiral structure.”

Cavalleri is a group leader at the MPSD. He summarizes, “ This discovery opens up new possibilities for the dynamical control of matter at the atomic level. We are excited to see potential applications of this technology and how it can be used to create unique functionality. The ability to induce chirality in non-chiral materials could lead to new applications in ultrafast memory devices, or even more sophisticated optoelectronic platforms.”

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