Journal
NEW JOURNAL OF PHYSICS
Volume 19, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/aa9b56
Keywords
parity-time symmetry; gauge transformation; constitutive matrix; transmission line; metamaterials
Categories
Funding
- European Union's Seventh Framework Programme (FP7) [630979]
- Austrian Science Fund (FWF) [F49]
- NSFC [61621001, 11674247]
- Austrian Science Fund (FWF) [F49] Funding Source: Austrian Science Fund (FWF)
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We introduce here the concept of establishing parity-time (PT)-symmetry through a gauge transformation involving a shift of the mirror plane for the parity operation. The corresponding unitary transformation on the system's constitutive matrix allows us to generate and explore a family of equivalent PT-symmetric systems. Wefurther derive that unidirectional zero reflection for a reciprocal two-port system can always be associated with a passively gauged PT-symmetry. We demonstrate this experimentally using a microstrip transmission-line with magnetoelectric coupling. This study allows us to use bianisotropy as a practical route to realise and explore exceptional point behaviour of PT-symmetric or generally non-Hermitian systems.
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