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What can we learn from the experiment of electrostatic conveyor belt for excitons?
J Phys Condens Matter
October 2024
Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, People's Republic of China.
Article Synopsis
- Scientists studied excitons, which are special particles made of an electron and a hole, to understand how they move and create patterns in experiments.
- They found that patterns close to the light source came from "hot" excitons acting like regular particles, while patterns farther away came from "cooled" excitons that behave differently.
- By using a complex equation, they modeled how these excitons move over time and found results that matched experiments, showing that how quickly excitons cool down is key to their movement.
Non-Hermitian Mott Skin Effect.
Phys Rev Lett
August 2024
Department of Materials Engineering Science, Osaka University, Toyonaka 560-8531, Japan.
We propose a novel type of skin effects in non-Hermitian quantum many-body systems that we dub a "non-Hermitian Mott skin effect." This phenomenon is induced by the interplay between strong correlations and the non-Hermitian point-gap topology. The Mott skin effect induces extreme sensitivity to the boundary conditions only in the spin degree of freedom (i.
View Article and Find Full Text PDFDirac Cones and Room Temperature Polariton Lasing Evidenced in an Organic Honeycomb Lattice.
Adv Sci (Weinh)
June 2024
Lehrstuhl für Technische Physik, Physikalisches Institut and Würzburg-Dresden Cluster of Excellence ct.qmat, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.
Artificial 1D and 2D lattices have emerged as a powerful platform for the emulation of lattice Hamiltonians, the fundamental study of collective many-body effects, and phenomena arising from non-trivial topology. Exciton-polaritons, bosonic part-light and part-matter quasiparticles, combine pronounced nonlinearities with the possibility of on-chip implementation. In this context, organic semiconductors embedded in microcavities have proven to be versatile candidates to study nonlinear many-body physics and bosonic condensation, and in contrast to most inorganic systems, they allow the use at ambient conditions since they host ultra-stable Frenkel excitons.
View Article and Find Full Text PDFQuantum simulation of the bosonic Kitaev chain.
Nat Commun
April 2024
Institute for Quantum Computing and Department of Electrical & Computer Engineering, University of Waterloo, Waterloo, ON, N2L 3G1, Canada.
Superconducting quantum circuits are a natural platform for quantum simulations of a wide variety of important lattice models describing topological phenomena, spanning condensed matter and high-energy physics. One such model is the bosonic analog of the well-known fermionic Kitaev chain, a 1D tight-binding model with both nearest-neighbor hopping and pairing terms. Despite being fully Hermitian, the bosonic Kitaev chain exhibits a number of striking features associated with non-Hermitian systems, including chiral transport and a dramatic sensitivity to boundary conditions known as the non-Hermitian skin effect.
View Article and Find Full Text PDFOptomechanical realization of the bosonic Kitaev chain.
Nature
March 2024
Center for Nanophotonics, AMOLF, Amsterdam, The Netherlands.
The fermionic Kitaev chain is a canonical model featuring topological Majorana zero modes. We report the experimental realization of its bosonic analogue in a nano-optomechanical network, in which the parametric interactions induce beam-splitter coupling and two-mode squeezing among the nanomechanical modes, analogous to hopping and p-wave pairing in the fermionic case, respectively. This specific structure gives rise to a set of extraordinary phenomena in the bosonic dynamics and transport.
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