Quantum topological phase transitions in skyrmion crystals
Topological order is important in many aspects of condensed matter physics and has been extended to bosonic systems. In this Letter we report on the nontrivial topology of the magnon bands in two distinct quantum skyrmion crystals appearing in zero external magnetic field. This is revealed by nonzer...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2022-08-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.4.L032025 |
| _version_ | 1827285455984394240 |
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| author | Kristian Mæland Asle Sudbø |
| author_facet | Kristian Mæland Asle Sudbø |
| author_sort | Kristian Mæland |
| collection | DOAJ |
| description | Topological order is important in many aspects of condensed matter physics and has been extended to bosonic systems. In this Letter we report on the nontrivial topology of the magnon bands in two distinct quantum skyrmion crystals appearing in zero external magnetic field. This is revealed by nonzero Chern numbers for some of the bands. As a bosonic analog of the quantum anomalous Hall effect, we show that topological magnons can appear in skyrmion crystals without explicitly breaking time-reversal symmetry with an external magnetic field. By tuning the value of the easy-axis anisotropy at zero temperature, we find eight quantum topological phase transitions signaled by discontinuous jumps in certain Chern numbers. We connect these quantum topological phase transitions to gaps closing and reopening between magnon bands. |
| first_indexed | 2024-04-24T10:13:47Z |
| format | Article |
| id | doaj.art-4c887ddc637a41a9b45eed5195775327 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:13:47Z |
| publishDate | 2022-08-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-4c887ddc637a41a9b45eed51957753272024-04-12T17:23:42ZengAmerican Physical SocietyPhysical Review Research2643-15642022-08-0143L03202510.1103/PhysRevResearch.4.L032025Quantum topological phase transitions in skyrmion crystalsKristian MælandAsle SudbøTopological order is important in many aspects of condensed matter physics and has been extended to bosonic systems. In this Letter we report on the nontrivial topology of the magnon bands in two distinct quantum skyrmion crystals appearing in zero external magnetic field. This is revealed by nonzero Chern numbers for some of the bands. As a bosonic analog of the quantum anomalous Hall effect, we show that topological magnons can appear in skyrmion crystals without explicitly breaking time-reversal symmetry with an external magnetic field. By tuning the value of the easy-axis anisotropy at zero temperature, we find eight quantum topological phase transitions signaled by discontinuous jumps in certain Chern numbers. We connect these quantum topological phase transitions to gaps closing and reopening between magnon bands.http://doi.org/10.1103/PhysRevResearch.4.L032025 |
| spellingShingle | Kristian Mæland Asle Sudbø Quantum topological phase transitions in skyrmion crystals Physical Review Research |
| title | Quantum topological phase transitions in skyrmion crystals |
| title_full | Quantum topological phase transitions in skyrmion crystals |
| title_fullStr | Quantum topological phase transitions in skyrmion crystals |
| title_full_unstemmed | Quantum topological phase transitions in skyrmion crystals |
| title_short | Quantum topological phase transitions in skyrmion crystals |
| title_sort | quantum topological phase transitions in skyrmion crystals |
| url | http://doi.org/10.1103/PhysRevResearch.4.L032025 |
| work_keys_str_mv | AT kristianmæland quantumtopologicalphasetransitionsinskyrmioncrystals AT aslesudbø quantumtopologicalphasetransitionsinskyrmioncrystals |