Download file (4.9MB)
Download as zip (4.6MB)

コレクション

引用

説明:

First-order phase transitions produce abrupt changes to the character of both ground and excited electronic states. Here we conduct electronic compressibility measurements to map the spin phase diagram and Landau level (LL) energies of monolayer WSe2 in a magnetic field. We resolve a sequence of first- order phase transitions between completely spin-polarized LLs and states with LLs of both spins. Unexpectedly, the LL gaps are roughly constant over a wide range of magnetic fields below the transitions, which we show reflects spin-polarized ground states with opposite spin excitations. These transitions also extend into compressible regimes, with a sawtooth boundary between full and partial spin polarization. We link these observations to the important influence of LL filling on the exchange energy beyond a smooth density-dependent contribution. Our results show that WSe2 realizes a unique hierarchy of energy scales where such effects induce reentrant magnetic phase transitions tuned by density and magnetic field.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Phase transitions, spin phase diagram, WSe2

刊行年月日: 2024-08-01

出版者: American Physical Society (APS)

掲載誌:

• Physical Review X (ISSN: 21603308) vol. 14 issue. 3 031018

研究助成金:

• Division of Materials Research NSF-DMR-2103910
• Office of Science DE-SC0023109
• U.S. Department of Energy
• Basic Energy Sciences DE-AC02-76SF00515
• Japan Society for the Promotion of Science 20H00354
• Japan Society for the Promotion of Science 23H02052
• Ministry of Education, Culture, Sports, Science and Technology
• National Science Foundation ECCS-2026822
• NSF MRSEC DMR-2011738
• World Premier International Research Center Initiative
• Stanford Nano Shared Facilities

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1103/physrevx.14.031018

関連資料:

その他の識別子:

連絡先:

更新時刻: 2025-02-05 12:30:48 +0900

MDRでの公開時刻: 2025-02-05 12:30:48 +0900