In this work we investigate the X-ray edge singularity problem realized in noninteracting quantum dots. We analytically calculate the exponent of the singularity in the absorption spectrum near the threshold and extend known analytical results to the whole parameter regime of local level detunings. ...
A quantum critical point (QCP), separating the non-Fermi liquid region fromthe Fermi liquid, exists in the phase diagram of the 2D Hubbard model[Vidhyadhiraja et. al, Phys. Rev. Lett. 102, 206407 (2009)]. Due to thevanishing of the critical temperature associated with a phase separation...
It is shown that the dynamical consistency requirements of quantum field theory and the Lorentz-invariant character of particle kinematics and wave equations are compatible with the postulate that physical space is a complex manifold with Euclidean-Gaussian measure in the small. Such a postulate for ...
In particular, we identify a Van Hove singularity, a clearly observable sharp feature within a continuum response. The demonstration of such a Van Hove singularity in a two-magnon continuum is important as a confirmation of broadly held notions of continua in quantum magnetism and additionally ...
Science Physics Quantum mechanics What is a quantum singularity?Question:What is a quantum singularity?Quantum Singularity:The term quantum singularity is frequently used in order to describe the extreme conditions that take place within black holes and the ongoing effort to develop a quantum theory ...
WE-Heraeus-Seminar ``Aspects of Quantum Gravity'' at Bad Honnef, 25 February--1 March 2002 P Hajicek - 《Lecture Notes in Physics》 被引量: 23发表: 2003年 Singularity avoidance and time in quantum gravity We consider the quantization of a Friedmann-Robertson-Walker universe. We derive a ...
The association of quantum Griffiths singularity (QGS) to the magnetic-field-induced superconductor-metal transition predicts the unconventional diverging behaviour of dynamical critical exponent in low disorder crystalline two-dimensional superconductors. But whether this state exists in the superconducting syst...
Wald. Singularity structure of the two-point function in quantum field theory in curved spacetime. Comm. Math. ... S.A,Fulling,and,... - 《Annals of Physics》 被引量: 347发表: 1981年 Quantum field theory of metallic spin glasses We introduce an effective field theory for the vicinity ...
Ding Jia (贾丁) *Perimeter Institute for Theoretical Physics, Waterloo, Ontario, N2L 2Y5,CanadaDepartment of Physics and Astronomy, University of Waterloo, Waterloo,Ontario, N2L 3G1, CanadaAbstractMany non-trivial ideas have been proposed to resolve singularities in quantum grav-ity. In this ...
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