Observation of a Chiral State in a Microwave Cavity

A microwave experiment has been realized to measure the phase difference of the oscillating electric field at two points inside the cavity. The technique has been applied to a dissipative resonator which exhibits a singularity -- called exceptional point -- in its eigenvalue and eigenvector spectrum. At the singularity, two modes coalesce with a phase difference of

\pi/2 .

We conclude that the state excited at the singularity has a definitiv chirality.

02.30.-f
41.20.Jb
03.65.Vf
05.45.Mt

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