Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 90, Issue 7, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.90.074703
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Funding
- 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
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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.
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