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Dirac and Majorana edge states in graphene and topological
Dirac and Majorana edge states in graphene and topological

Entanglement Theory and the Quantum
Entanglement Theory and the Quantum

Topological phases and polaron physics in ultra cold quantum gases
Topological phases and polaron physics in ultra cold quantum gases

... Publications ...
Perspective: Fifty years of density-functional theory in chemical physics
Perspective: Fifty years of density-functional theory in chemical physics

... and δEδρXC is the functional derivative2 of EXC with respect to ρ. The theory is now complete. Electrons in atoms, molecules, and solids can be viewed as independent particles, moving in the effective potential vKS . Kohn-Sham DFT is astounding in its simplicity. It is operationally an independent-p ...
The fourth age of quantum chemistry - of Attila G. Császár
The fourth age of quantum chemistry - of Attila G. Császár

Ph125: Quantum Mechanics
Ph125: Quantum Mechanics

Theoretical study of open-shell van der Waals complexes Anna V. Fishchuk
Theoretical study of open-shell van der Waals complexes Anna V. Fishchuk

TrajectoryBased Nonadiabatic Dynamics with TimeDependent
TrajectoryBased Nonadiabatic Dynamics with TimeDependent

Applied Quantum Mechanics
Applied Quantum Mechanics

Appendix A: Integrator Programs - IDEALS @ Illinois
Appendix A: Integrator Programs - IDEALS @ Illinois

The theory of bio-energy transport in the protein molecules and its
The theory of bio-energy transport in the protein molecules and its

Preparing projected entangled pair states on a quantum computer
Preparing projected entangled pair states on a quantum computer

Two Qubits Tavis-Cummings Model Beyond the Rotating Wave
Two Qubits Tavis-Cummings Model Beyond the Rotating Wave

Excited states from time-dependent density functional theory
Excited states from time-dependent density functional theory

... properties of large molecules, because it replaces the interacting many-electron problem with an effective singleparticle problem that can be solved much more quickly. It is based on rigorous theorems[1, 2, 4] and a hierarchy of increasingly accurate approximations, such as the local density approxi ...
Theories of Experimentally Observed Excitation
Theories of Experimentally Observed Excitation

... existing theories in order to allow a quantitative interpretation of experimentally measured quantities. This quantitative analysis then allows comparison across different experimental techniques helping to build an overall consistent experimental picture. The occurrence of these two approaches in a ...
TIME-REVERSAL INVARIANT TOPOLOGICAL INSULATORS A
TIME-REVERSAL INVARIANT TOPOLOGICAL INSULATORS A

Resolution-of-identity approach to Hartree–Fock, hybrid
Resolution-of-identity approach to Hartree–Fock, hybrid

Quantum Field Theory in Condensed Matter Physics 2nd Ed.
Quantum Field Theory in Condensed Matter Physics 2nd Ed.

Quantum_doc
Quantum_doc

... psib, or psik, where b and k stand for bra and ket wavefunctions; these are all complex vectors, using the Cn.c complex style. They also always require xr to be a real vector of corresponding x values and n to be the number of real values in xr and the number of complex values in psi. Where units ar ...
The CKM Matrix and CP Violation
The CKM Matrix and CP Violation

...  “C and CP violation”, if CP is conserved for a reaction which generates a net number of baryons over anti-baryons there would be a CP conjugate reaction generating a net number of anti-baryons  “Departure from thermal equilibrium”, in thermal equilibrium any baryon number violating process will b ...
Properties of Graphene in an External Magnetic
Properties of Graphene in an External Magnetic

... to Boehm’s forming of the expression, Geim describes graphene with the following words: ”graphene is stronger and stiffer than diamond, yet can be stretched by a quarter of its length, like rubber. Its surface area is the largest known for its weight.” - Andre Geim In 2010, Geim and Novoselov were a ...
Resticted 3-Body Problem
Resticted 3-Body Problem

... round n-dimensional sphere. In the planar case the double cover of the geodesic flow on the round two dimensional sphere can be interpreted as the Hamiltonian flow of two uncoupled harmonic oscillators via Levi-Civita regularization. 3.3. Magnetic Hamiltonians. Mechanical Hamiltonians model physical ...
- Philsci-Archive
- Philsci-Archive

BASIS SET SUPERPOSITION ERROR EFFECTS, EXCITED-STATE POTENTIAL ENERGY SURFACE AND
BASIS SET SUPERPOSITION ERROR EFFECTS, EXCITED-STATE POTENTIAL ENERGY SURFACE AND

Entanglement in periodically driven quantum systems
Entanglement in periodically driven quantum systems

... systems or driving mechanisms, a comprehensive understanding of the interrelation of entanglement and periodic driving is still lacking to date. This is, hence, the main concern of the present thesis. Specifically, we are guided by the following questions: I Under which conditions does continuous, p ...
1 2 3 4 5 ... 59 >

Perturbation theory (quantum mechanics)

In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a mathematical solution is known, and add an additional ""perturbing"" Hamiltonian representing a weak disturbance to the system. If the disturbance is not too large, the various physical quantities associated with the perturbed system (e.g. its energy levels and eigenstates) can be expressed as ""corrections"" to those of the simple system. These corrections, being small compared to the size of the quantities themselves, can be calculated using approximate methods such as asymptotic series. The complicated system can therefore be studied based on knowledge of the simpler one.
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