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61.
JETP Letters - This work is motivated by the recent paper [M. Baldovin, S. Iubini, R. Livi, and A. Vulpiani, Statistical mechanics of systems with negative temperature, arXiv:2103.12572]. The... 相似文献
62.
The type-II Weyl and type-II Dirac points emerge in semimetals and in relativistic systems. In particular, the type-II Weyl fermions may emerge behind the event horizon of black holes. The type-II Weyl and Dirac points also emerge as the intermediate states of the topological Lifshitz transitions. In one case, the type-II Weyl point connects the Fermi pockets, and the Lifshitz transition corresponds to the transfer of the Berry flux between the Fermi pockets. In the other case, the type-II Weyl point connects the outer and inner Fermi surfaces. At the Lifshitz transition, the Weyl point is released from both Fermi surfaces. They loose their Berry flux, which guarantees the global stability, and without the topological support, the inner surface disappears after shrinking to a point at the second Lifshitz transition. These examples reveal the complexity and universality of topological Lifshitz transitions, which originate from the ubiquitous interplay of a variety of topological characters of the momentum-space manifolds. 相似文献
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Journal of Experimental and Theoretical Physics - Theory of elasticity in topological insulators has many common features with relativistic quantum fields interacting with gravitational fields in... 相似文献
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G. E. Volovik 《JETP Letters》2017,105(1):34-37
In the theory of the chiral anomaly in relativistic quantum field theories (RQFTs), some results depend on a regularization scheme at ultraviolet. In the chiral superfluid 3He-A, which contains two Weyl points and also experiences the effects of chiral anomaly, the “trans-Planckian” physics is known and the results can be obtained without regularization. We discuss this on example of the chiral magnetic effect (CME), which has been observed in 3He-A in the 1990s [1]. There are two forms of the contribution of the CME to the Chern–Simons term in free energy, perturbative and non-perturbative. The perturbative term comes from the fermions living in the vicinity of the Weyl point, where the fermions are “relativistic” and obey the Weyl equation. The non-perturbative term originates from the deep vacuum, being determined by the separation of the two Weyl points in momentum space. Both terms are obtained using the Adler–Bell–Jackiw equation for chiral anomaly, and both agree with the results of the microscopic calculations in the “trans-Planckian” region. Existence of the two nonequivalent forms of the Chern–Simons term demonstrates that the results obtained within the RQFT depend on the specific properties of the underlying quantum vacuum and may reflect different physical phenomena in the same vacuum. 相似文献
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The regioselectivity of free radical attack on olefins is considered with respect to the correspondence between energy components in the Morokuma scheme and their analogs in the orbital scheme (FMO approximation) in terms of ambivalence of radicals and the effectiveness of reactant deformation, with the purpose of fitting a CT model.Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR Kiev. Translated from Teoreticheskaya i Éxperimental Khimiya, Vol. 27, No. 4, pp. 474–478, July–August, 1991. Original article submitted March 14, 1991. 相似文献
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V. M. Ruutu Ü. Parts B. Plaçais Wen Xu G. E. Volovik M. Krusius 《Czechoslovak Journal of Physics》1996,46(1):15-16
In a smooth-walled rotating container vortices nucleate spontaneously in3He-B at a critical velocityv c (T, P) which is related to the bulk superflow instability velocityv cb (T, P). This process takes place at the wall of the container. Vortices are also observed to nucleate at lower velocities in the bulk liquid in ionizing radiation. For this thermal neutrons are most practical since for them the absorption cross section is large in3He. An absorption event creates local overheating, a hot bubble in the cold superflow. An increasing number of vortex rings is observed to emerge from the bubble as a function of the superflow velocity. 相似文献