



01808nas a2200169   4500008004100000245009500041210006900136260001500205300000800220490000600228520129700234100001801531700001601549700001901565700001701584856003701601       2017                        eng d00aDynamically induced robust phonon transport and chiral cooling in an optomechanical system0 aDynamically induced robust phonon transport and chiral cooling i  c2017/06/19  a2050 v83 a<p><span style="font-family: &quot;Lucida Grande&quot;, helvetica, arial, verdana, sans-serif; font-size: 14.4px;">The transport of sound and heat, in the form of phonons, has a fundamental material limit: disorder-induced scattering. In electronic and optical settings, introduction of chiral transport - in which carrier propagation exhibits broken parity symmetry - provides robustness against such disorder by preventing elastic backscattering. Here we experimentally demonstrate a path for achieving robust phonon transport even in the presence of material disorder, by dynamically inducing chirality through traveling-wave optomechanical coupling. Using this approach, we demonstrate dramatic optically-induced chiral transport for clockwise and counterclockwise phonons in a symmetric resonator. This induced chirality also enhances isolation from the thermal bath and leads to gain-free reduction of the intrinsic damping of the phonons. Surprisingly, this passive mechanism is also accompanied by a chiral reduction in heat load leading to a novel optical cooling of the mechanics. This technique has the potential to improve upon the fundamental thermal limits of resonant mechanical sensor, which cannot be otherwise attained through conventional optomechanical cooling.</span></p>1 aKim, Seunghwi1 aXu, Xunnong1 aTaylor, J., M.1 aBahl, Gaurav  uhttps://arxiv.org/abs/1609.08674