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2 results on '"Particle"'

1. Quantum Mechanics: Myths and Facts.

Author

Nikolić, Hrvoje

Subjects
*QUANTUM field theory, *RELATIVISTIC quantum theory, *PARTICLES (Nuclear physics), *ENTROPY, *PHYSICS
Abstract

A common understanding of quantum mechanics (QM) among students and practical users is often plagued by a number of “myths”, that is, widely accepted claims on which there is not really a general consensus among experts in foundations of QM. These myths include wave-particle duality, time-energy uncertainty relation, fundamental randomness, the absence of measurement-independent reality, locality of QM, nonlocality of QM, the existence of well-defined relativistic QM, the claims that quantum field theory (QFT) solves the problems of relativistic QM or that QFT is a theory of particles, as well as myths on black-hole entropy. The fact is that the existence of various theoretical and interpretational ambiguities underlying these myths does not yet allow us to accept them as proven facts. I review the main arguments and counterarguments lying behind these myths and conclude that QM is still a not-yet-completely-understood theory open to further fundamental research. [ABSTRACT FROM AUTHOR]

Published
2007
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2. Competition between spontaneous symmetry breaking and single-particle gaps in trilayer graphene

Author

Jairo Velasco, Kevin Myhro, Jean-Marie Poumirol, Dmitry Smirnov, David Tran, Francisco Guinea, Yafis Barlas, Chun Ning Lau, Yongjin Lee, Nathaniel Gillgren, National Science Foundation (US), State of Florida, University of California, Department of Energy (US), and Defense Advanced Research Projects Agency (US)

Subjects
Physics, Multidisciplinary, Condensed matter physics, Graphene, Spontaneous symmetry breaking, General Physics and Astronomy, General Chemistry, General Biochemistry, Genetics and Molecular Biology, law.invention, Competition (economics), law, Simple (abstract algebra), Quantum mechanics, Particle
Abstract

Many physical phenomena can be understood by single-particle physics; that is, treating particles as non-interacting entities. When this fails, many-body interactions lead to spontaneous symmetry breaking and phenomena such as fundamental particles' mass generation, superconductivity and magnetism. Competition between single-particle and many-body physics leads to rich phase diagrams. Here we show that rhombohedral-stacked trilayer graphene offers an exciting platform for studying such interplay, in which we observe a giant intrinsic gap ~42 meV that can be partially suppressed by an interlayer potential, a parallel magnetic field or a critical temperature ~36 K. Among the proposed correlated phases with spatial uniformity, our results are most consistent with a layer antiferromagnetic state with broken time reversal symmetry. These results reflect the interplay between externally induced and spontaneous symmetry breaking whose relative strengths are tunable by external fields, and provide insight into other low-dimensional systems., We thank R. Cote for discussions. Y.L., K.M. and C.N.L. are supported by DOE BES Division under grant no. ER 46940-DE-SC0010597. Part of this work was performed at NHMFL that is supported by NSF/DMR-0654118, the State of Florida, and DOE. D.T. is supported by NSF DMR/1106358. Y.B. is supported by CONSEPT center at UCR. Nanofabrication and supplies are supported in part by DMEA H94003-10-2-1003 and CONSEPT center.

Published
2014

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