By A. O. Caldeira

ISBN-10: 052111375X

ISBN-13: 9780521113755

Reviewing macroscopic quantum phenomena and quantum dissipation, from the phenomenology of magnetism and superconductivity to the presentation of different versions for quantum dissipation, this publication develops the elemental fabric essential to comprehend the quantum dynamics of macroscopic variables. Macroscopic quantum phenomena are awarded via a number of examples in magnetism and superconductivity, constructed from basic phenomenological techniques to every region. Dissipation evidently performs a huge position in those phenomena, and as a result semi-empirical types for quantum dissipation are brought and utilized to the learn of some very important quantum mechanical results. The ebook additionally discusses the relevance of macroscopic quantum phenomena to the keep an eye on of meso- or nanoscopic units, quite people with power functions in quantum computation or quantum info. it's excellent for graduate scholars and researchers.

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Extra resources for An Introduction to Macroscopic Quantum Phenomena and Quantum Dissipation

Example text

However, this is not the only effect we should take into account. The droplet formation is followed by a distortion of the magnetization, which is energetically costly and competes with the previous effect we have just described. Consequently, depending on the size of the region formed with reverse magnetization, the positive surface energy due to the distortion can impede the droplet expansion. This is the case for droplets with a volume smaller than a critical volume. The latter is defined exactly as the volume above which the volumetric energy reduction achieved by inverting a given number of spins wins over the surface energy caused by distortion.

In the strong pinned situation, once a segment of a critical length jumps to the lower-energy minimum, it drags the whole line after itself to the new configuration whereas in the present case, there is a sort of sluggish diffusive motion of the wall to lower-energy configurations. At any rate, the important conclusion is that in both cases we can talk about critical lengths, fields and energy barriers which are the desiderata to implement 9780521113755book 42 CUP/CAAA-L1 November 4, 2013 16:56 Page-42 Elements of magnetism the general theory of thermal activation for either case.

At any rate, the important conclusion is that in both cases we can talk about critical lengths, fields and energy barriers which are the desiderata to implement 9780521113755book 42 CUP/CAAA-L1 November 4, 2013 16:56 Page-42 Elements of magnetism the general theory of thermal activation for either case. Actually, this is not only applicable to thermal fluctuations. If one considers now the full (non-dissipative) dynamics of the wall at very low temperatures, one is led to ask about quantum mechanical fluctuations (tunneling) once the appropriate parameters turn out to form an effective action not overwhelmingly larger than .

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An Introduction to Macroscopic Quantum Phenomena and Quantum Dissipation by A. O. Caldeira


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