Barry Bradlyn

Sep 20, 2024 | link.aps.org | Ian S. Osborne |Gustavo M. Monteiro |Staten Island |Barry Bradlyn

We examine the hydrostatic stress of electrons strongly confined in a quasi-two-dimensional quantum well in the presence of a strong perpendicular and weak in-plane magnetic field. This introduces anisotropy into the stress tensor which is inconsistent with the notion of the quantum Hall droplet as a simple two-dimensional electron fluid.

Aug 5, 2024 | link.aps.org | Peizhi Mai |Jinchao Zhao |Thomas Maier |Barry Bradlyn

We show here two models where changing topology does not necessarily close the bulk insulating charge gap as demanded in the standard noninteracting picture. From extensive determinantal and dynamical cluster quantum Monte Carlo simulations of the half-filled and quarter-filled Kane-Mele-Hubbard model, we show that, for sufficiently strong interactions at either half- or quarter-filling, a transition between topological and trivial insulators occurs without the closing of a charge gap.

May 2, 2024 | nature.com | Jonas A. Krieger |Kaustuv Manna |Emily C. McFarlane |Mihir Date |J. Hugo Dil |Chandra Shekhar | +10 more

AbstractSpin-orbit coupling in noncentrosymmetric crystals leads to spin-momentum locking – a directional relationship between an electron’s spin angular momentum and its linear momentum. Isotropic orthogonal Rashba spin-momentum locking has been studied for decades, while its counterpart, isotropic parallel Weyl spin-momentum locking has remained elusive in experiments.

Mar 27, 2024 | link.aps.org | Robert McKay |Fahad Mahmood |Barry Bradlyn

Popular Summary Most everyday materials obey Ohm’s law, which says the current through a material is proportional to the voltage across it. In topological materials, violations of this law can be related to the underlying physics of the material. Much experimental and theoretical work in this area has focused on studying current that does not vary in space across the material.