Dynamics of Dirac strings and monopolelike excitations in chiral magnets under a current drive
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Skyrmion lines in metallic chiral magnets carry an emergent magnetic field experienced by the conduction electrons. The inflow and outflow of this field across a closed surface is not necessarily equal, thus it allows for the existence of emergent monopoles. One example is a segment of skyrmion line inside a crystal, where a monopole and antimonopole pair is connected by the emergent magnetic flux line. This is a realization of Dirac stringlike excitations. Here we study the dynamics of monopoles in chiral magnets under an electric current. We show that in the process of creation of skyrmion lines, skyrmion line segments are first created via the proliferation of monopoles and antimonopoles. Then these line segments join and span the whole system through the annihilation of monopoles. The skyrmion lines are destroyed via the proliferation of monopoles and antimonopoles at high currents, resulting in a chiral liquid phase. We also propose to create the monopoles in a controlled way by applying an inhomogeneous current to a crystal. Remarkably, an electric field component in the magnetic field direction proportional to the current squared in the low current region is induced by the motion of distorted skyrmion lines, in addition to the Hall and longitudinal voltage. As a result, the existence of monopoles can be inferred from transport or imaging measurements.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1248635
- Alternate ID(s):
- OSTI ID: 1237798
- Report Number(s):
- LA-UR-15-20295; PRBMDO
- Journal Information:
- Physical Review B, Vol. 93, Issue 6; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Ultrasonic elastic responses in a monopole lattice
|
journal | April 2017 |
Kelvin modes of a skyrmion line in chiral magnets and the associated magnon transport
|
journal | April 2019 |
Current-induced dynamics of skyrmion strings
|
journal | August 2018 |
| Electric transport in three-dimensional Skyrmion/monopole crystal | text | January 2016 |
| Ultrasonic elastic responses in monopole lattice | text | January 2016 |
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