Bulletin of the American Physical Society
APS March Meeting 2017
Volume 62, Number 4
Monday–Friday, March 13–17, 2017; New Orleans, Louisiana
Session Y23: New Developments in Topological Photonics: Interactions, Non-Hermiticity and BeyondInvited
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Sponsoring Units: DCMP Chair: Chaoxing Liu, Penn State University Room: New Orleans Theater B |
Friday, March 17, 2017 11:15AM - 11:51AM |
Y23.00001: Chiral ground-state currents of interacting photons in a synthetic magnetic field Invited Speaker: Pedram Roushan The intriguing many-body phases of quantum matter arise from the interplay of particle interactions, spatial symmetries, and external fields. Generating these phases in an engineered system could provide deeper insight into their nature. Using superconducting qubits, we simultaneously realize synthetic magnetic fields and strong particle interactions, which are among the essential elements for studying quantum magnetism and fractional quantum Hall phenomena. The artificial magnetic fields are synthesized by sinusoidally modulating the qubit couplings. In a closed loop formed by the three qubits, we observe the directional circulation of photons, a signature of broken time-reversal symmetry. We demonstrate strong interactions through the creation of photon vacancies, or `holes', which circulate in the opposite direction. The combination of these key elements results in chiral groundstate currents, the first direct measurement of persistent currents in low-lying eigenstates of strongly interacting bosons. Our work introduces an experimental platform for engineering quantum phases of strongly interacting~photons. [Preview Abstract] |
Friday, March 17, 2017 11:51AM - 12:27PM |
Y23.00002: Three-Dimensional All-Dielectric Photonic Topological Insulator Invited Speaker: Alexander Khanikaev The discovery of two-dimensional topological photonic systems has transformed our views on propagation and scattering of electromagnetic waves, and a quest for similar states in three dimensions has been put forward. Here we demonstrate that symmetry protected three-dimensional topological states can be engineered in an all-dielectric platform with the electromagnetic duality between electric and magnetic fields ensured by the structure design. Magneto-electric coupling playing the role of a synthetic gauge field leads to a topological transition to an ``insulating'' regime with a complete three-dimensional photonic bandgap. An emergence of surface states with conical Dirac dispersion and spin-locking is unimpeded. Robust propagation of surface states along two-dimensional domain walls is confirmed numerically by first principle studies. The proposed system represents a table-top platform for emulating relativistic physics of massive Dirac fermions and the surface states can be interpreted as Jackiw-Rebbi states bound to the interface separating domains with opposite particle masses. [Preview Abstract] |
Friday, March 17, 2017 12:27PM - 1:03PM |
Y23.00003: Quantum transport properties in topological photonics Invited Speaker: Mohammad Hafezi Robust transport of topological edge states has been experimentally demonstrated in photonic systems at microwave frequencies and optical frequencies, specifically in coupled waveguides and ring resonators. Subsequent works measured the topological invariants associated with these photonic systems. In this talk, we extend these ideas to investigate quantum transport properties of light. Specifically, we demonstrate that all-dielectric photonic crystals could exhibit similar topological physics, where two-dimensional edge states are confined by total internal reflection, enabling low-loss confinement of light in the third dimension. This structure addresses the challenge of experimental realization of topological photonic crystals in the optical domain and enables strong interactions with optical emitters. Moreover, we investigate quantum effects such as the transport of two-photon states and robust generation of photon pairs in such on-chip topological photonic devices. [Preview Abstract] |
Friday, March 17, 2017 1:03PM - 1:39PM |
Y23.00004: Experimental observation of optical Weyl points and Fermi arcs Invited Speaker: Mikael Rechtsman We directly observe the presence type-II Weyl points for optical photons in a three-dimensional dielectric structure comprising arrays of evanescently-coupled, single-mode, helical waveguides. We also observe the corresponding Fermi arc surface states emerging from Weyl points (despite the use of the `Fermi arc' terminology, we are referring to bosons rather than fermions). The Weyl points are manifested by the presence of conical diffraction at the Weyl frequency in the photonic band structure, and the Fermi arc states are manifested by the emergence of surface states as we scan in frequency past the Weyl point. We map the Weyl points to Dirac points of the isofrequency surface, and the Fermi arcs to chiral edge states of an anomalous Floquet insulator.\\ \\In collaboration with: Jiho Noh,[1] Sheng Huang,[2] Daniel Leykam*,[3] Y. D. Chong,[3,4] Kevin Chen,[2] and Mikael C. Rechtsman[1]\\ \\$[1]$ Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA [2] Department of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA [3] School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore [4] Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371, Singapore [Preview Abstract] |
Friday, March 17, 2017 1:39PM - 2:15PM |
Y23.00005: Topological Insulator Laser and New ideas in Topological Photonics Invited Speaker: Mordechai Segev |
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