期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 90, 期 7, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.90.074703
关键词
-
资金
- JSPS Fellowship for Young Scientists
- MEXT of Japan [17K05517]
- KAKENHI [JP15H05852, JP18H04318]
- JST CREST, Japan [JPMJCR19T5]
- Grants-in-Aid for Scientific Research [17K05517] Funding Source: KAKEN
The research explores the impact of disorder on Landau levels in Dirac electron systems using a non-Hermitian quasiparticle Hamiltonian formalism. The formalism unveils that spin-dependent scattering rates lead to a collapse of Landau levels, where energy gaps vanish between n- and -n-th levels under a finite external magnetic field. The collapse occurs in both weak and strong magnetic field regimes, showing a reentrant behavior.
We investigate disorder effects on Landau levels in Dirac electron systems with the use of a non-Hermitian quasiparticle Hamiltonian formalism. This formalism reveals that spin-dependent scattering rates induce the spectrum collapse of Landau levels, i.e., the disappearance of the energy gaps between n- and -n-th levels under a finite external magnetic field. The spectrum collapse occurs in both weak and strong magnetic field regimes, thus showing a reentrant behavior. Particularly, in the strong magnetic field regime, in contrast to naive expectation, the increase of a magnetic field stabilizes the spectrum collapse of Dirac Landau levels. Furthermore, it is revealed that the spectrum collapse is associated with the emergence of a vortex texture with a topological winding number of a complex energy spectrum of the non-Hermitian system.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据