Geometrical Hall effect and momentum-space Berry curvature from spin-reversed band pairs

Max Hirschberger, Yusuke Nomura, Hiroyuki Mitamura, Atsushi Miyake, Takashi Koretsune, Yoshio Kaneko, Leonie Spitz, Yasujiro Taguchi, Akira Matsuo, Koichi Kindo, Ryotaro Arita, Masashi Tokunaga, Yoshinori Tokura

研究成果: Article査読


When nanometric, noncoplanar spin textures with scalar spin chirality (SSC) are coupled to itinerant electrons, they endow the quasiparticle wave functions with a gauge field, termed Berry curvature, in a way that bears analogy to relativistic spin-orbit coupling (SOC). The resulting deflection of moving charge carriers is termed the geometrical (or topological) Hall effect. Previous experimental studies modeled this signal as a real-space motion of wave packets under the influence of a quantum-mechanical phase. In contrast, we here compare the modification of Bloch waves themselves and of their energy dispersion due to SOC and SSC. Using the canted pyrochlore ferromagnet Nd2Mo2O7 as a model compound, our transport experiments and first-principles calculations show that SOC impartially mixes electronic bands with equal or opposite spin, while SSC is much more effective for opposite-spin band pairs.

ジャーナルPhysical Review B
出版ステータスPublished - 2021 1 25

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

フィンガープリント 「Geometrical Hall effect and momentum-space Berry curvature from spin-reversed band pairs」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。