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Entanglement entropy of 2D conformal quantum critical points: hearing the shape of a quantum drum.
The entanglement entropy of a pure quantum state of a bipartite system A union or logical sumB is defined as the von Neumann entropy of the reduced density matrix obtained by tracing over one of the
The birth of topological insulators
Certain insulators have exotic metallic states on their surfaces that render the electrons travelling on such surfaces insensitive to scattering by impurities, possibly finding uses in technological applications in spintronics and quantum computing.
Unbounded growth of entanglement in models of many-body localization.
The significance for proposed atomic experiments is that local measurements will show a large but nonthermal entropy in the many-body localized state, which develops slowly over a diverging time scale as in glassy systems.
Magnetoelectric polarizability and axion electrodynamics in crystalline insulators.
The orbital motion of electrons in a three-dimensional solid can generate a pseudoscalar magnetoelectric coupling theta, a fact that can be generalized to the many-particle wave function and defines the 3D topological insulator in terms of a topological ground-state response function.
Topological surface States in three-dimensional magnetic insulators.
This Letter gives an efficient algorithm to compute whether a given magnetic band structure has nontrivial Hopf invariant, a double-exchange-like tight-binding model that realizes the nontrivials case, and a numerical study of the surface states of this model.
Crossover from incoherent to coherent phonon scattering in epitaxial oxide superlattices.
An unambiguous demonstration of the theoretically predicted crossover from diffuse (particle- like) to specular (wave-like) phonon scattering in epitaxial oxide superlattices, manifested by a minimum in lattice thermal conductivity as a function of interface density is presented.
Quantized circular photogalvanic effect in Weyl semimetals
In a class of Weyl semimetals and three-dimensional Rashba materials without inversion and mirror symmetries, the injection contribution to the CPGE trace is effectively quantized in terms of the fundamental constants e, h, c and with no material-dependent parameters.
Thermal conductance of thin silicon nanowires.
In contrast to previous models, the present study suggests that phonon-boundary scattering is highly frequency dependent, and ranges from nearly ballistic to completely diffusive, which can explain the unexpected linear temperature dependence.
Chiral Spin Liquid Phase of the Triangular Lattice Hubbard Model: A Density Matrix Renormalization Group Study
Motivated by experimental studies that have found signatures of a quantum spin liquid phase in organic crystals whose structure is well described by the two-dimensional triangular lattice, we study
Antiferromagnetic topological insulators
We consider antiferromagnets breaking both time-reversal $(\ensuremath{\Theta})$ and a primitive-lattice translational symmetry $({T}_{1/2})$ of a crystal but preserving the combination