Inducing a metal-insulator transition in disordered interacting Dirac fermion systems via an external magnetic field

Meng, Jingyao; Mondaini, Rubem; Ma, Tianxing; Lin, Hai‐Qing

doi:10.1103/physrevb.104.045138

Cited by 7 publications

(2 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3 (a), N(0) approaches zero at T → 0 in the case of x ≤ 0.1, suggesting that the system opens a gap. As x increases, N(0) in the thermodynamic limit gradually becomes a finite value, indicating that the gap closes [49]. The result of N(0) is consistent with that measured by conductivity; that is, an increased dilution concentration causes an insulator to become a metallic phase by closing the energy gap.…”

Section: Resultssupporting

confidence: 84%

An intermediate phase induced by dilution in a correlated Dirac Fermi system

Tian¹,

Meng²,

Ma³

2022

Preprint

View full text Add to dashboard Cite

Substituting magnetic ions with nonmagnetic ions is a new way to study dilution. Using determinant quantum Monte Carlo calculations, we investigate an interacting Dirac fermion model with the on-site Coulomb repulsion being randomly zero on a fraction x of sites. Based on conductivity, density of states and antiferromagnetic structure factor, our results reveal a novel intermediate insulating phase induced by the competition between dilution and repulsion. With increasing doping level of nonmagnetic ions, this nonmagnetic intermediate phase is found to emerge from the zero-temperature quantum critical point separating a metallic and a Mott insulating phase, whose robustness is proven over a wide range of interactions. Under the premise of strongly correlated materials, we suggest that doping nonmagnetic ions can effectively convert the system back to the paramagnetic metallic phase. This result not only agrees with experiments on the effect of dilution on magnetic order but also provides a possible direction for studies focusing on the metal-insulator transition in honeycomb lattice like materials.

show abstract

Section: Resultssupporting

confidence: 84%

An intermediate phase induced by dilution in a correlated Dirac Fermi system

Tian¹,

Meng²,

Ma³

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Furthermore, it is of great interest to generalize the link between structural periodicity and dynamical properties to high-dimensional systems, non-Hermitian system, and many-body system. ,− It provides a promising approach to exploring the role of disorder in physical phenomena, such as topological phase transition, metal–insulator transition, and glass transition. ,− …”

Section: Discussionmentioning

confidence: 99%

Probing Structural Correlated Disorder with Photonic Transport

Yang,

Chang,

et al. 2024

ACS Photonics

View full text Add to dashboard Cite

Wave spreading has been widely studied in various disordered materials including quasiperiodic, amorphous, and completely random materials based on the spatial order. However, there is no clear observable mechanism connecting the underlying correlated disorder to wave transport. Here, we experimentally probe correlated disorder with different characteristic length scales in disordered materials by directly observing the photonic transport on a chip. The density of states of corresponding aperiodic structures shows different degrees of singularity, suggesting diverse behaviors of photons. By analyzing localization and transport properties of photons, we demonstrate that compared to the nearly ballistic transport in the quasiperiodic lattice with long-range order, photon behavior is partly destroyed from ballistic transport in amorphous lattices with short-range order while totally deviating from ballistic spreading in completely random lattices without spatial order. The spreading coefficient related to the photon variance represents an evident difference for correlated disorder with different characteristic length scales. The resolution of diverse transport behaviors is sufficient to distinguish different disorder types, suggesting an eligible identifier for disorder materials.

show abstract

Magnetic phase transition in disordered interacting Dirac fermion systems via the Zeeman field

Meng

Zhang

et al. 2022

Phys. Rev. B

View full text Add to dashboard Cite

Inducing a metal-insulator transition in disordered interacting Dirac fermion systems via an external magnetic field

Cited by 7 publications

References 54 publications

An intermediate phase induced by dilution in a correlated Dirac Fermi system

An intermediate phase induced by dilution in a correlated Dirac Fermi system

Probing Structural Correlated Disorder with Photonic Transport

Magnetic phase transition in disordered interacting Dirac fermion systems via the Zeeman field

Contact Info

Product

Resources

About