scholarly journals Global phase diagram of two-dimensional Dirac fermions in random potentials

2012 ◽  
Vol 85 (23) ◽  
Author(s):  
S. Ryu ◽  
C. Mudry ◽  
A. W. W. Ludwig ◽  
A. Furusaki
Keyword(s):  
Phase Diagram ◽  
Dirac Fermions ◽  
Two Dimensional ◽  
Random Potentials ◽  
Global Phase Diagram

scholarly journals Oblique and Asymmetric Klein Tunneling across Smooth NP Junctions or NPN Junctions in 8-Pmmn Borophene

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1462
Author(s):  
Zhan Kong ◽  
Jian Li ◽  
Yi Zhang ◽  
Shu-Hui Zhang ◽  
Jia-Ji Zhu
Keyword(s):  
Phase Diagram ◽  
Electrical Resistance ◽  
Normal Incidence ◽  
Quantum Structures ◽  
Dirac Fermions ◽  
Two Dimensional ◽  
Dirac Cone ◽  
Klein Tunneling ◽  
Properties Of Materials ◽  
Massless Fermions

The tunneling of electrons and holes in quantum structures plays a crucial role in studying the transport properties of materials and the related devices. 8-Pmmn borophene is a new two-dimensional Dirac material that hosts tilted Dirac cone and chiral, anisotropic massless Dirac fermions. We adopt the transfer matrix method to investigate the Klein tunneling of massless fermions across the smooth NP junctions and NPN junctions of 8-Pmmn borophene. Like the sharp NP junctions of 8-Pmmn borophene, the tilted Dirac cones induce the oblique Klein tunneling. The angle of perfect transmission to the normal incidence is 20.4∘, a constant determined by the Hamiltonian of 8-Pmmn borophene. For the NPN junction, there are branches of the Klein tunneling in the phase diagram. We find that the asymmetric Klein tunneling is induced by the chirality and anisotropy of the carriers. Furthermore, we show the oscillation of electrical resistance related to the Klein tunneling in the NPN junctions. One may analyze the pattern of electrical resistance and verify the existence of asymmetric Klein tunneling experimentally.

MAGNETIC PHASE DIAGRAM IN FIELD INDUCED SUPERCONDUCTORS λ-(BETS)2FexGa1-xCl4

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3084-3088
Author(s):  
S. UJI ◽  
C. TERAKURA ◽  
T. TERASHIMA ◽  
T. YAKABE ◽  
Y. IMANAKA ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Diagram ◽  
Magnetic Phase ◽  
Electronic States ◽  
Magnetic Phase Diagram ◽  
Internal Field ◽  
Organic Conductors ◽  
High Magnetic Fields ◽  
Two Dimensional ◽  
Global Phase Diagram

Electronic states have been investigated under high magnetic fields for quasi-two-dimensional organic conductors λ- (BETS) 2 Fe x Ga 1-x Cl 4 (x = 1.0, 0.47, 0.45, 0). Under magnetic field parallel to the c-axis, various electronic states appear, depending on x, field, and temperature. The global phase diagram for this alloy is presented and the evidence of the strong internal field due to the Fe moments is shown.

scholarly journals Comprehensive study of the global phase diagram of the J−K−Γ model on a triangular lattice

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
Shi Wang ◽  
Zhongyuan Qi ◽  
Bin Xi ◽  
Wei Wang ◽  
Shun-Li Yu ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Triangular Lattice ◽  
Global Phase Diagram ◽  
Comprehensive Study

scholarly journals NONCOMMUTATIVE GRAPHENE

2013 ◽  
Vol 28 (16) ◽  
pp. 1350064 ◽  
Author(s):  
CATARINA BASTOS ◽  
ORFEU BERTOLAMI ◽  
NUNO COSTA DIAS ◽  
JOÃO NUNO PRATA
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Dirac Equation ◽  
Energy Levels ◽  
Dirac Fermions ◽  
Two Dimensional ◽  
Dirac System ◽  
Noncommutative Parameter

We consider a noncommutative description of graphene. This description consists of a Dirac equation for massless Dirac fermions plus noncommutative corrections, which are treated in the presence of an external magnetic field. We argue that, being a two-dimensional Dirac system, graphene is particularly interesting to test noncommutativity. We find that momentum noncommutativity affects the energy levels of graphene and we obtain a bound for the momentum noncommutative parameter.

COMPLEX BIFURCATION STRUCTURES IN THE HINDMARSH–ROSE NEURON MODEL

2007 ◽  
Vol 17 (09) ◽  
pp. 3071-3083 ◽  
Author(s):  
J. M. GONZÀLEZ-MIRANDA
Keyword(s):  
Phase Diagram ◽  
Bifurcation Diagram ◽  
Parameter Space ◽  
Neuron Model ◽  
Two Dimensional ◽  
Dimensional Parameter ◽  
Rapid Responses ◽  
Bifurcation Structures

The results of a study of the bifurcation diagram of the Hindmarsh–Rose neuron model in a two-dimensional parameter space are reported. This diagram shows the existence and extent of complex bifurcation structures that might be useful to understand the mechanisms used by the neurons to encode information and give rapid responses to stimulus. Moreover, the information contained in this phase diagram provides a background to develop our understanding of the dynamics of interacting neurons.

scholarly journals Universal behavior of the bosonic metallic ground state in a two-dimensional superconductor

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Zhuoyu Chen ◽  
Bai Yang Wang ◽  
Adrian G. Swartz ◽  
Hyeok Yoon ◽  
Yasuyuki Hikita ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Diagram ◽  
Quantum Phase Transitions ◽  
Metallic State ◽  
Two Dimensional ◽  
Metallic Behavior ◽  
Universal Behavior ◽  
Hall Resistivity ◽  
Wide Range ◽  
Metal State

AbstractAnomalous metallic behavior, marked by a saturating finite resistivity much lower than the Drude estimate, has been observed in a wide range of two-dimensional superconductors. Utilizing the electrostatically gated LaAlO3/SrTiO3 interface as a versatile platform for superconductor-metal quantum phase transitions, we probe variations in the gate, magnetic field, and temperature to construct a phase diagram crossing from superconductor, anomalous metal, vortex liquid, to the Drude metal state, combining longitudinal and Hall resistivity measurements. We find that the anomalous metal phases induced by gating and magnetic field, although differing in symmetry, are connected in the phase diagram and exhibit similar magnetic field response approaching zero temperature. Namely, within a finite regime of the anomalous metal state, the longitudinal resistivity linearly depends on the field while the Hall resistivity diminishes, indicating an emergent particle-hole symmetry. The universal behavior highlights the uniqueness of the quantum bosonic metallic state, distinct from bosonic insulators and vortex liquids.

Low-density phase diagram of the two-dimensional Coulomb gas

1986 ◽  
Vol 33 (1) ◽  
pp. 499-509 ◽  
Author(s):  
J. M. Caillol ◽  
D. Levesque
Keyword(s):  
Phase Diagram ◽  
Coulomb Gas ◽  
Low Density ◽  
Two Dimensional

Phase diagram of a two-dimensional lattice-gas model of oxygen ordering inYBa2Cu3Ozwith realistic interactions

1995 ◽  
Vol 52 (13) ◽  
pp. 9784-9792 ◽  
Author(s):  
D. J. Liu ◽  
T. L. Einstein ◽  
P. A. Sterne ◽  
L. T. Wille
Keyword(s):  
Phase Diagram ◽  
Lattice Gas ◽  
Lattice Gas Model ◽  
Two Dimensional ◽  
Dimensional Lattice ◽  
Oxygen Ordering
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