2015/06/11 by M. Granada, D. Lucot, R. Giraud +7
Materials Science · Physics and Astronomy · #Berry #Berry connection and curvature #Condensed matter physics #Electronic band structure #Ferromagnetism #Geometric phase #Graphene research and applications #Magnetic field #Magnetization #Materials science #Mesoscopic physics #Phase (matter) #Physics #Quantum and electron transport phenomena #Quantum mechanics #Semiconductor #Topological Materials and Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.91.235203
published as Phys. Rev. B 91, 235203 (2015) · 7 pages, 6 figures
openalex publication_date 2015/06/11 · arxiv created 2015/06/12 · arxiv updated 2015/06/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report on experimental evidence of the Berry phase accumulated by the charge-carrier wave function in single-domain nanowires made from a (Ga, Mn)(As, P) diluted ferromagnetic semiconductor layer. Its signature on the mesoscopic transport measurements is revealed as unusual patterns in the magnetoconductance that are clearly distinguished from the universal conductance fluctuations. We show that these patterns appear in a magnetic field region where the magnetization rotates coherently and are related to a change in the band-structure Berry phase as the magnetization direction changes. They should thus be considered a band-structure Berry phase fingerprint of the effective magnetic monopoles in the momentum space. We argue that this is an efficient method to vary the band structure in a controlled way and to probe it directly. Hence, (Ga, Mn)As appears to be a very interesting test bench for new concepts based on this geometrical phase.