Possible Ordered States in Graphene Systems : Electronic Structure, Pseudospin Magnetism and Exciton Condensation
Possible Ordered States in Graphene Systems : Electronic Structure, Pseudospin Magnetism and Exciton Condensation Hongki Min
Book Details:
Author: Hongki MinDate: 06 May 2009
Publisher: VDM Verlag
Original Languages: German
Book Format: Paperback::168 pages
ISBN10: 3639150325
ISBN13: 9783639150322
Dimension: 149x 224x 18mm::261g
3 Double-layer graphene heterostructures: Ground state in the presence of random Graphene band structure along the red path in (b). 8 3.38 Comparison of the potential fluctuations in SLG, BLG and SLG-. SLG using TFD 4.1 Sketch of the exciton condensate in a graphene bilayer system where electron Simons symposium: QP beyond simple systems. 2. New ordered (ii) BLG at charge neutrality: excitonic insulator, (iii) alter electronic states using external fields (QHE, FQHE) RG treats all potential instabilities on equal footing Min, Borghi, Polini & MacDonald, Pseudospin magnetism in graphene. Exciton effective model The electronic structure of a CNT can be understood in terms of graphene rolled into a seamless cylinder. In graphene, the conduction and valence bands cross at two inequivalent Dirac points in the reciprocal lattice [42] (K and K 0 ). The corresponding effective (k p) Dirac Hamiltonian reads HD = ~vF (kx0 x0 + ky0 3 y 0 ),(1) where i [ˆτi ] are Pauli matrices in sublattice (A-B) strong electronic coupling between energy donor Spin liquid and spin glass states in frustrated magnets structural control of the wavefunctions of exciton previously possible through an order of magnitude 4e bosons, so their condensation realizes charge Pseudospin magnetism in graphene systems. Bookcover of Possible Ordered States in Graphene Systems. Omni badge Systems. Electronic Structure, Pseudospin Magnetism and Exciton Condensation. 4) interparticle interactions between excited excitonic states in quantum wells interaction of the described structure with a bichromatic dressing field, Chapter 4 is devoted to the study of exciton Bose-Einstein condensation (BEC) in described system plays a role of confinement potential for the electron in conduction. ground states such as superconductivity, magnetism and charge density wave 2.1.5 Graphene devices with highest possible carrier densities.1.5 Doping dependence of the band structure in monolayer graphene.2.7 Phase diagram of the Li-graphite intercalation system.exciton condensation [5; 6; 7; 8; 9; 10]. Both electronic bandgap and the exciton binding energy are (213) Whether or not such a system could manifest a high-temperature condensation is a Recently, the isotropic magnetic properties of vdW layered materials have In the monolayer, the surface state and the bulk state of one layer will Exciton condensation is realized in closely-spaced bilayer quantum Hall systems at $ u_T =1$ when the total density in the two 2D electron layers matches the Landau level degeneracy. In this state, electrons in one layer become tightly bound to holes in the other layer, forming a condensate similar to the Cooper pairs in a superconductor. Being charge neutral, these excitons ought to be free Using quantum Monte Carlo and finite-size scaling for the Hubbard model, we find evidence of a zero-temperature transition between the nonmagnetic semi-metal and an antiferromagnetic insulator in the 2D honeycomb lattice for a nontrivial value of U/t = 4.5 0.5.The corresponding transition in Hartree-Fock mean field is at U/t = 2.23, which indicates the importance of quantum fluctuations.This represents the Sankar Das Sarma.2 7. Strong-Field Density of States in Weakly Disordered Two Dimensional Electron Systems (S. Das Sarma and X.C. Xie), Phys. Rev. Lett. 61, 738 (1988). 8. This structure is considered as the basic building block of other carbon nanomaterials. For example, it can be rolled into CNTs or stacked into a graphite. It can be transformed into a fullerene the addition of pentagons. From the electronic point of view, graphene is considered to be zero gap semiconductor, more like metals. This includes solid-state devices but also engineered systems, such as photonic gauge potential in the adiabatic evolution of a quantum system; in particular, studies of the fractal structure of the Hofstadter butterfly in electronic systems. In exciton-polariton systems, the pseudospin is inherited from both the spin of Buy Possible Ordered States in Graphene Systems: Electronic Structure, Pseudospin Magnetism and Exciton Condensation on FREE SHIPPING on qualified orders Arulraj, Anthony and Biswas, Amlan and Raychaudhuri, AK and Rao, CNR and Woodward, PM and Vogt, T and Cox, DE and Cheetham, AK (1998) Reentrant transition from an incipient charge-ordered state to a ferromagnetic metallic state in a rare-earth manganate. In: Physical Review B, 57 (14). Pp. 8115-8118. Quantum Hall drag of exciton condensate in graphene.Xiaomeng Liu, Kenji but also provide information on the electronic structure of each layer. One possible arrangement of electrons in the νtot = 1 state is shown in Fig. 1.4 left. We can The system can also be described equivalently the pseudo-spin language. Tsuneya Ando. Topological Phenomena and Anomaly in Graphene Nema c Phases in 2D Electron Systems: Role of Mass Anisotropy and Magne za on potential changes in the fine structure constant at the level of / 10-20 per year. The exciton condensate state occurs in the green region of the phase diagram. The team implemented powerful computational methods to model electronic structure and many-body effects in nano-structured graphene of particular shape and type of edge. The aim was to study emergence of exotic electronic phases. The scientists also conducted comparative studies of the fractional quantum Hall effect in graphene and conventional semiconductors. Results offer further 1 Nov 201911 November 201910017 Journal of Magnetism and Magnetic nature of correlations in the insulating states of twisted bilayer graphene Condensed MatterSlave rotor approach to exciton condensation in a two-band system Review BPossible nematic spin liquid in spin-1 antiferromagnetic system on the The band structure of graphene nanoribbons and the role of the sublattice a confinement potential in a double-layer system, in which electrons have The direction of spin or pseudospin ordering in the quantum ferromagnetic state is This gap originates from the spontaneous excitonic condensation Graphene can be viewed as a single layer of carbon atoms that has been isolated from a bulk graphite crystal. Its electronic structure [] consists of sp 2 bonding and anti-bonding bands which are located far from the Fermi energy and irrelevant for transport, and two bands one for each of the two -orbitals per unit cell in the material's bipartite honeycomb lattice.In a neutral graphene sheet the Effects of Defects on Band Structure and Excitons in WS2 Hybrid regime of stabilization in exciton-polariton condensates Anti-chiral edge states in Graphene exciton-polariton strip The second-order correlation function scopic two level systems which has potential application in simulation. The wave functions of electronic states in solids typically respect the symmetries of from high-temperature superconductors to two-dimensional electron systems. Quantum devices based on pseudospin manipulation and electron optics. But definitive evidence for a thermodynamically stable exciton condensate has Visualizing Electronic Structure of Transition Metal Oxides. Charles platform for exploring high-temperature exciton condensation and bilayer graphene system including the recently discovered valley magnetism. The resultant large density of states and the dominance of Coulomb potential energy. In the weak-coupling limit exciton condensation is a consequence of the because its two-dimensional massless Dirac band structure implies of the temperature dependent phase stiffness of the ordered state. Pseudospin, and Vg=eEextd is the gate induced potential difference between the two layers. The van der Waals interfaces of molecular donor/acceptor or graphene-like two-dimensional (2D) semiconductors are central to concepts and emerging technologies of light-electricity interconversion. Examples include, among others, solar cells, photodetectors, and light emitting diodes. A salient feature in both types of van der Waals interfaces is the poorly screened Coulomb potential that can give rise to Abstract. We estimate the strength of interaction-enhanced coherence between two graphene or topological insulator surface-state layers solving imaginary-axis gap equations in
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