2026/03/29 by Megha Bera, Bijay Kumar Sahoo, Abhiram Soori
Physics and Astronomy · #Ferromagnetism #Field (mathematics) #Magnetic field #Quantum and electron transport phenomena #Surface and Thin Film Phenomena #Topological Materials and Phenomena #Transverse plane #Work (physics) #Zeeman effect #cond-mat.mes-hall
paper · pdf · doi:10.1103/pfyp-g4t5
openalex publication_date 2026/06/24 · openalex created_date 2026/06/25 · openalex updated_date 2026/08/05
We study charge transport across a junction between a normal metal and a Rashba metal in the presence of a Zeeman field applied to the spin--orbit coupled region. While an out-of-plane Zeeman field does not generate a transverse response in a homogeneous Rashba system, we show that such a junction exhibits a finite transverse conductivity that is inherently nonreciprocal, i.e., it depends on the direction of the applied bias. We demonstrate that this effect originates from the breaking of the ky → -ky symmetry of the Hamiltonian in the presence of the Zeeman field, which prevents cancellation of transverse current contributions from opposite transverse momenta. We further show that evanescent modes in the spin--orbit coupled region play a crucial role by carrying a finite spin polarization that gives rise to a transverse current localized near the junction. The transverse conductivity exhibits a peak at an energy scale set by the Zeeman field, displays distinct behavior for opposite bias directions, and shows spatial dependence governed by the nature of the contributing modes. We also identify bound states at the junction for attractive barrier strengths, which enhance conductivity when their energies lie near the transport window. Our results reveal a mechanism for nonreciprocal transverse charge transport in Rashba systems without requiring in-plane magnetic fields or ferromagnetic contacts, and should be experimentally accessible in semiconductor heterostructures.