A chemical turnstile is a device for transporting small, well-characteriseddoses of atoms from one location to another. A working turnstile has yet to bebuilt, despite the numerous technological applications available for such adevice. The key difficulty in manufacturing a chemical turnstile is finding amedium which will trap and transport atoms. Here we propose that ferroelastictwin walls are suitable for this role. Previous work shows that twin walls canact as two-dimensional trapping planes within which atomic transport is fast.We report simulations showing that a stress-induced reorientation of a twinwall can occur. This behaviour is ideal for chemical turnstile applications.
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