Parity-time symmetry at OWTNM

One of the most interesting talks at the conference was on Parity-Time symmetry by H.Benisty and relating these to reciprocity or lack thereof.

Hermitian operators have real eignvalues. By adding imaginary terms of opposite signs to the diagonal terms, the eignevalues can still remain real! These imaginary terms in the physical picture can be seen as loss/gain. The possibility of spatial-nonreciprocity comes in.

Here are a list of papers worth looking at to get more on this:
1. Physical Review Letters, Vol. 80, pp. 5243-5246, 1998
2. Nature Physics, Vol. 6, 192-195, 2010
3. Optics Express, Vol. 13, pp. 3068-3078, 2005
4. Physical Review Letters, Vol. 106, 213901, 2011
5. Nature Materials, Vol.12, 108-113, 2012
6. Optics Express, Vol. 19, pp. 18004-18019, 2011
7. Optics Express, Vol. 21, pp. 21651-21668, 2013

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