{"id":33559,"date":"2025-07-02T21:10:07","date_gmt":"2025-07-02T21:10:07","guid":{"rendered":"https:\/\/www.europesays.com\/us\/33559\/"},"modified":"2025-07-02T21:10:07","modified_gmt":"2025-07-02T21:10:07","slug":"nonlinear-currents-emerge-in-symmetry-broken-materials","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/us\/33559\/","title":{"rendered":"Nonlinear currents emerge in symmetry-broken materials"},"content":{"rendered":"

\"Breaking<\/p>\n

Artistic representation of the breakdown of Ohm\u2019s law and the resulting nonlinear effects in a non-centrosymmetric crystal. Credit: Elhuyar Fundazioa<\/p>\n

In a review just published<\/a> in Nature Materials, researchers take aim at the oldest principle in electronics: Ohm’s law.<\/p>\n

Their article, “Nonlinear transport in non-centrosymmetric systems,” brings together rapidly growing evidence that, when a material lacks inversion symmetry, the familiar linear relation between current and voltage can break down, giving rise to striking quadratic responses.<\/p>\n

The study was led by Manuel Su\u00e1rez-Rodr\u00edguez\u2014working under the guidance of Ikerbasque Professors F\u00e8lix Casanova and Luis E. Hueso at CIC nanoGUNE, together with Prof. Marco Gobbi at the Materials Physics Center (CFM, CSIC-UPV\/EHU).<\/p>\n

“Over the past five years we have observed numerous reports of nonlinear transport effects intimately linked to the symmetry of the host material,” explains lead author Su\u00e1rez-Rodr\u00edguez. “Once we grasped this connection, our goal was to weave the disparate results into a coherent picture that condensed-matter and materials physicists can exploit to advance this promising field.”<\/p>\n

Co-authors Fernando de Juan (Donostia International Physics Center, DIPC) and Ivo Souza (CFM) helped clarify how broken inversion symmetry unlocks new microscopic mechanisms\u2014chief among them the Berry curvature dipole and the recently proposed Berry-connection polarizability\u2014that generate nonlinear and rectification voltages directly from an applied bias.<\/p>\n

“Because these mechanisms are intrinsic to the material itself\u2014not to interfaces or external stimuli<\/a>\u2014they can operate across a wide frequency range and down to the single-layer limit,” adds Su\u00e1rez-Rodr\u00edguez.<\/p>\n

\"Breaking<\/p>\n

Wireless RF rectification. Credit: Nature Materials (2025). DOI: 10.1038\/s41563-025-02261-3<\/p>\n

Beyond fundamental interest, the team highlights two application frontiers. First, nonlinear effects provide a versatile and powerful route to probe charge-to-spin conversion, helping identify candidate materials for next-generation spintronics.<\/p>\n

Second, these effects can be harnessed for wireless radio-frequency rectification, promising size reductions of several orders of magnitude relative to state-of-the-art devices and enabling rectification at, or even below, the microscale\u2014opening possibilities for on-chip RF harvesters and biosensors.<\/p>\n

The review<\/a> is already serving as a roadmap for researchers developing quantum-enabled electronics\u2014where “breaking the rules” of Ohm’s law is the key.<\/p>\n

More information:<\/strong>
\n\t\t\t\t\t\t\t\t\t\t\t\tManuel Su\u00e1rez-Rodr\u00edguez et al, Nonlinear transport in non-centrosymmetric systems, Nature Materials (2025). DOI: 10.1038\/s41563-025-02261-3<\/a><\/p>\n

\n\t\t\t\t\t\t\t\t\t\t\t\t\tProvided by
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tElhuyar Fundazioa<\/a>
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n

\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n

\n\t\t\t\t\t\t\t\t\t\t\t\tCitation<\/strong>:
\n\t\t\t\t\t\t\t\t\t\t\t\tBreaking Ohm’s law: Nonlinear currents emerge in symmetry-broken materials (2025, July 2)
\n\t\t\t\t\t\t\t\t\t\t\t\tretrieved 2 July 2025
\n\t\t\t\t\t\t\t\t\t\t\t\tfrom https:\/\/phys.org\/news\/2025-07-ohm-law-nonlinear-currents-emerge.html\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n

\n\t\t\t\t\t\t\t\t\t\t\t This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
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