Zobrazeno 1 - 10
of 183
pro vyhledávání: '"Jankowski, Wojciech"'
Excitons dominate the optoelectronic response of many materials. Depending on the timescale and host material, excitons can exhibit free diffusion, phonon-limited diffusion, or polaronic diffusion, and exciton transport often limits the efficiency of
Externí odkaz:
http://arxiv.org/abs/2410.00967
Following the recent interest in van der Waals (vdW) ferroelectrics, topologically nontrivial polar structures have been predicted to form in twisted bilayers. Due to the unconventional nature of vdW ferroelectricity, these topological polar structur
Externí odkaz:
http://arxiv.org/abs/2408.04017
Autor:
Wahl, Thorsten B., Jankowski, Wojciech J., Bouhon, Adrien, Chaudhary, Gaurav, Slager, Robert-Jan
We report on a class of gapped projected entangled pair states (PEPS) with non-trivial Euler topology motivated by recent progress in band geometry. In the non-interacting limit, these systems have optimal conditions relating to saturation of quantum
Externí odkaz:
http://arxiv.org/abs/2407.12902
Excitons drive the optoelectronic properties of organic semiconductors which underpin devices including solar cells and light-emitting diodes. We demonstrate that excitons can exhibit topologically non-trivial states and identify a family of organic
Externí odkaz:
http://arxiv.org/abs/2406.11951
Autor:
Jankowski, Wojciech J., Morris, Arthur S., Davoyan, Zory, Bouhon, Adrien, Ünal, F. Nur, Slager, Robert-Jan
Publikováno v:
Phys. Rev. B 110, 075135 (2024)
We discuss a class of three-band non-Abelian topological insulators in three dimensions that carry a single bulk Hopf index protected by spatiotemporal ($\mathcal{PT}$) inversion symmetry. These phases may also host subdimensional topological invaria
Externí odkaz:
http://arxiv.org/abs/2405.17305
Autor:
Jankowski, Wojciech J., Bennett, Daniel, Agarwal, Aneesh, Chaudhary, Gaurav, Slager, Robert-Jan
Publikováno v:
Phys. Rev. B 110, 085429 (2024)
Two-dimensional materials are a highly tunable platform for studying the momentum space topology of the electronic wavefunctions and real space topology in terms of skyrmions, merons, and vortices of an order parameter. Such textures for electronic p
Externí odkaz:
http://arxiv.org/abs/2404.16919
We show that certain 3D multi-gap topological insulators can host quantized shift photoconductivities due to bulk invariants that are defined under reality conditions imposed by additional symmetries. We recast the quantization in terms of the integr
Externí odkaz:
http://arxiv.org/abs/2402.13245
We analyze quantum-geometric bounds on optical weights in topological phases with pairs of bands hosting non-trivial Euler class, a multi-gap invariant characterizing non-Abelian band topology. We show how the bounds constrain the combined optical we
Externí odkaz:
http://arxiv.org/abs/2311.07545
Publikováno v:
Phys. Rev. B 109, 165125 (2024)
We report on a certain class of three-dimensional topological insulators and semimetals protected by spinless $\mathcal{P}\mathcal{T}$ symmetry, hosting an integer-valued bulk invariant. We show using homotopy arguments that these phases host multi-g
Externí odkaz:
http://arxiv.org/abs/2308.15555
Publikováno v:
Phys. Rev. B 110, 064202 (2024)
We study the effect of disorder in systems having a non-trivial Euler class. As these recently proposed multi-gap topological phases come about by braiding non-Abelian charged band nodes residing between different bands to induce stable pairs within
Externí odkaz:
http://arxiv.org/abs/2306.13084