Zobrazeno 1 - 10
of 57
pro vyhledávání: '"Ellis, F. M."'
Publikováno v:
Phys. Rev. Applied 13, 014060 (2020)
We study the nature of an environment-induced exceptional point in a non-Hermitian pair of coupled mechanical oscillators. The mechanical oscillators are a pair of pillars carved out of a single isotropic elastodynamic medium made of aluminum and con
Externí odkaz:
http://arxiv.org/abs/1908.00793
Publikováno v:
Phys. Rev. Lett. 119, 093901 (2017)
We provide an experimental framework where periodically driven PT-symmetric systems can be investigated. The set-up, consisting of two UHF oscillators coupled by a time-dependent capacitance, demonstrates a cascade of PT-symmetric broken domains boun
Externí odkaz:
http://arxiv.org/abs/1702.05478
We show that gyrotropic structures with balanced gain and loss that respect anti-linear symmetries exhibit a giant non-reciprocity at the so-called exact phase where the eigenfrequencies of the isolated non-Hermitian set-up are real. The effect occur
Externí odkaz:
http://arxiv.org/abs/1701.04320
Publikováno v:
Phys. Rev. A 92, 041803 (2015)
We propose a family of {\it local} $\cal{PT}$-symmetric photonic lattices with transverse index gradient $\omega$, where the emergence of {\it stable} Bloch-Zener oscillations are controlled by the degree of non-Hermiticity $\gamma$ of the lattice. I
Externí odkaz:
http://arxiv.org/abs/1507.01136
Using a pair of coupled LRC cavities we experimentally demonstrate that instabilities and amplification action can be tamed by a spatially inhomogenous gain. Specifically we observe the counter-intuitive phenomenon of stabilization of the system even
Externí odkaz:
http://arxiv.org/abs/1309.3624
A broad-band reflectionless channel which supports unidirectional wave propagation originating from the interplay between gyrotropic elements and symmetrically placed gain and loss constituents is proposed. Interchange of the active elements together
Externí odkaz:
http://arxiv.org/abs/1303.0774
A mechanism for asymmetric transport based on the interplay between the fundamental symmetries of parity (P) and time (T) with nonlinearity is presented. We experimentally demonstrate and theoretically analyze the phenomenon using a pair of coupled v
Externí odkaz:
http://arxiv.org/abs/1301.7337
We show both theoretically and experimentally that a pair of inductively coupled active LRC circuits (dimer), one with amplification and another with an equivalent amount of attenuation, display all the features which characterize a wide class of non
Externí odkaz:
http://arxiv.org/abs/1209.2347
Publikováno v:
PRA 85, 062122 (2012)
The beat time {\tau}_{fpt} associated with the energy transfer between two coupled oscillators is dictated by the bandwidth theorem which sets a lower bound {\tau}_{fpt}\sim 1/{\delta}{\omega}. We show, both experimentally and theoretically, that two
Externí odkaz:
http://arxiv.org/abs/1205.1847
Mutually coupled modes of a pair of active LRC circuits, one with amplification and another with an equivalent amount of attenuation, provide an experimental realization of a wide class of systems where gain/loss mechanisms break the Hermiticity whil
Externí odkaz:
http://arxiv.org/abs/1109.2913