Work

Effective Magnetic Monopoles and Universal Conductance Fluctuations

Year: 2010

Type: article

Abstract: The observation of isolated positive and negative charges, but not isolated magnetic north and south poles, is an old puzzle. Instead, evidence of effective magnetic monopoles has been found in the abstract momentum space. Apart from Hall-related effects, few observable consequences of these abstract monopoles are known. Here, we show that it is possible to manipulate the monopoles by external magnetic fields and probe them by universal conductance fluctuation measurements in ferromagnets with strong spin-orbit coupling. The observed fluctuations are not noise, but reproducible quasiperiodic oscillations as a function of magnetization direction, a novel Berry phase fingerprint of the magnetic monopoles.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.105.207204

Authors: Kjetil M. D. Hals, Anh Kiet Nguyen, Xavier Waintal, Arne Brataas

Institutions: Norwegian University of Science and Technology, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, CEA Grenoble, Institut Nanosciences et Cryogénie

Language: English

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W1986208223

FWCI: 0.687

Cites: 19

Cited by: 8

Related to: 10