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PowerPoint - Subir Sachdev
PowerPoint - Subir Sachdev

... Talk online at http://sachdev.physics.harvard.edu ...
Topologically Ordered States and their Hamiltonians
Topologically Ordered States and their Hamiltonians

... braiding phenomena lead to fractional statistics of excitations and to the corresponding form of the topological order. Strongly correlated states form a certain part of the low-energy Hilbert space. When the considered excitations are spatially separated, a low-energy space turns to be degenerated, ...
Jim Greer
Jim Greer

... [email protected] Wave function methods such as configuration interaction and coupled cluster theory provide systematic treatments of electron correlations in nanoscale systems and provide accurate prediction for photoexcitation spectra in finite quantum systems. Arbitrarily accurate solutions to ...
Fulltext PDF - Indian Academy of Sciences
Fulltext PDF - Indian Academy of Sciences

Graphene
Graphene

... A typical snapshot of graphene at room temperature. The size of height fluctuations is comparable to the lattice size. ...
Spin Angular Momentum Magnetic Moments
Spin Angular Momentum Magnetic Moments

... νNMR is in the radiofrequency part of the electromagnetic spectrum so we use the term R.F. field when discussing the radiation required to irradiate NMR transitions. We usually refer to the 1H NMR frequency rather than the magnetic field as 1H is the most commonly studied nucleus. For uncoupled spin ...
Ground states and excitations of spatially anisotropic quantum antiferromagnets Oleg Starykh
Ground states and excitations of spatially anisotropic quantum antiferromagnets Oleg Starykh

... (J-J’) as a perturbation to interacting spin waves • single dimensionless parameter δ=(40/3)S(1 - J’/J)2: classical anisotropy energy ~ (J - J’)/J fully polarized state spin-wave gap ~ J/S ...
ABSTRACT – Condensed Matter Physics [ORIGINAL]
ABSTRACT – Condensed Matter Physics [ORIGINAL]

Nature of magnetism in double perovskite Ba2NaOsO6
Nature of magnetism in double perovskite Ba2NaOsO6

... Department of Physics, University of California, Davis, CA. 95616, USA ...
Quantum Monte Carlo Study of two dimensional electron gas with
Quantum Monte Carlo Study of two dimensional electron gas with

... bands, giving “quasi up – quasi down” spin polarization ...
Abstract
Abstract

... remanence is observed in the magnetic field dependence of EL polarization from an integrated p-(Ga,Mn)As/n-GaAs/(In,Ga)As/p-GaAs LED. It is also of great importance to understand the spin dephasing mechanism in semiconductor quantum structures. The spin relaxation time of electron spin must be suffi ...
Atoms in Latices 1
Atoms in Latices 1

Problem set 3
Problem set 3

... Û = e− 2 ασn = e− h̄ αn·Ŝ ...
Document
Document

Semiclassical approximation of excitations in spin-1 Heisenberg antiferromagnets
Semiclassical approximation of excitations in spin-1 Heisenberg antiferromagnets

Microscopic theory of the Casimir effect at thermal equilibrium: large
Microscopic theory of the Casimir effect at thermal equilibrium: large

... current-current interaction between currents carried by the loops ...
O  Strong-Arming Electron Spin Dynamics
O Strong-Arming Electron Spin Dynamics

... proposed using the spin of a single electron as a quantum bit. At the time of the proposal, it was not possible to trap a single electron in a device and measure its spin, let alone demonstrate control of quantum coherence. In this talk I will describe recent progress in the field, focusing on two n ...
Boltzmann factors and partition functions revisited
Boltzmann factors and partition functions revisited

... Boltzmann factors and partition functions revisited A brief summary of material from McQuarrie & Simon, Chapters 17 and 18, on the partition function and its use in the calculation of some equilibrium properties. You have already seen this material in Chem 389. The concepts outlined here will be app ...
to as MS Word file
to as MS Word file

... 2. The state function can be a purely real function. 3. The state function can be a purely imaginary function. 4. The probability density is independent of time for a stationary state. 5. If Aˆ and Bˆ are Hermitian operators and c1 and c2 are real constants, then c1 Aˆ + c2 Bˆ must be a Hermitia ...
Reflection Symmetry and Energy-Level Ordering in Frustrated Spin
Reflection Symmetry and Energy-Level Ordering in Frustrated Spin

... The spins within the same sublattice have the same direction. The spins of different sublattices are in opposite directions. Properties of the Néel state: Néel state minimizes all local interactions in the classical Hamiltonian. ...
Spin Incoherent Quantum Wires
Spin Incoherent Quantum Wires

... - try to distinguish by other properties? ...
Abstracts - Weizmann Institute of Science
Abstracts - Weizmann Institute of Science

... dimension is much higher than the number of colors, and prove that the system admits a staggered (chessboard-like pattern) long-range order, and hence has several translation-invariant Gibbs states. The result extends to the positive-temperature anti-ferromagnetic Potts model as long as the dimensio ...
Quantum phase transitions in atomic gases and condensed matter
Quantum phase transitions in atomic gases and condensed matter

... If both processes are permitted, they exactly cancel each other. The top processes is blocked when , m are nearest neighbors ...
Quantum Hall Plateau Transitions in Disordered Superconductors
Quantum Hall Plateau Transitions in Disordered Superconductors

... states at isolated energies in an otherwise localized spectrum. Physically, such systems have more than one distinct insulating phase, each characterized by its number of edge states and separated from other phases by delocalization transitions. Second, it may happen that the Hamiltonian has an addi ...
ESI Bose-Einstein Condensation as a Quantum Phase Transition in an Optical Lattice
ESI Bose-Einstein Condensation as a Quantum Phase Transition in an Optical Lattice

... on-site repulsion is U , but we consider here only the case of a hard-core interaction, i.e., U = ∞. If λ = 0 but U < ∞ we have the Bose-Hubbard model. Then all sites are equivalent and the lattice represents the attractive sites of the optical lattice. In our case the adjustable parameter is λ inst ...
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Ising model

The Ising model (/ˈaɪsɪŋ/; German: [ˈiːzɪŋ]), named after the physicist Ernst Ising, is a mathematical model of ferromagnetism in statistical mechanics. The model consists of discrete variables that represent magnetic dipole moments of atomic spins that can be in one of two states (+1 or −1). The spins are arranged in a graph, usually a lattice, allowing each spin to interact with its neighbors. The model allows the identification of phase transitions, as a simplified model of reality. The two-dimensional square-lattice Ising model is one of the simplest statistical models to show a phase transition.The Ising model was invented by the physicist Wilhelm Lenz (1920), who gave it as a problem to his student Ernst Ising. The one-dimensional Ising model has no phase transition and was solved by Ising (1925) himself in his 1924 thesis. The two-dimensional square lattice Ising model is much harder, and was given an analytic description much later, by Lars Onsager (1944). It is usually solved by a transfer-matrix method, although there exist different approaches, more related to quantum field theory.In dimensions greater than four, the phase transition of the Ising model is described by mean field theory.
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