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Topological winding number measured in a dissipative metamaterial

Event Details

Event Dates: 

Friday, September 22, 2017 - 11:00am

Seminar Location: 

  • Duane Physics Room G126

Speaker Name(s): 

Eric Rosenthal

Speaker Affiliation(s): 

University of Colorado, Boulder
Seminar Type/Subject

Scientific Seminar Type: 

  • CTQM Seminar

Event Details & Abstract: 

We observe a topological phase transition in a non-Hermitian metamaterial composed of resistors, capacitors and tunable inductors. Circuit band structure is measured and used to show that this transition is associated with a dark mode which passes from inside to outside a closed path in the complex space of the system’s eigenvector weights. Lattice excitations acquire a mean displacement that is quantized to within ±8% of an integer value when the system is far from the transition. Our results demonstrate that radio-frequency metamaterials provide an appealing platform to study and harness dissipative topological matter.