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Author: Mark Paul Sadgrove
Publisher:
ISBN:
Category : Coherence (Optics)
Languages : en
Pages : 195
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Book Description
Author: Mark Paul Sadgrove
Publisher:
ISBN:
Category : Coherence (Optics)
Languages : en
Pages : 195
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Book Description
Author: Paul R. Berman
Publisher: Academic Press
ISBN: 012385508X
Category : Science
Languages : en
Pages : 562
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Book Description
Advances in Atomic, Molecular, and Optical Physics publishes reviews of recent developments in a field which is in a state of rapid growth, as new experimental and theoretical techniques are used on many old and new problems. Topics covered include related applied areas, such as atmospheric science, astrophysics, surface physics and laser physics. Articles are written by distinguished experts, and contain both relevant review material and detailed descriptions of important recent developments. International experts Comprehensive articles New developments
Author:
Publisher: Academic Press
ISBN: 0123855098
Category : Science
Languages : en
Pages : 562
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Book Description
Advances in Atomic, Molecular, and Optical Physics publishes reviews of recent developments in a field which is in a state of rapid growth, as new experimental and theoretical techniques are used on many old and new problems. Topics covered include related applied areas, such as atmospheric science, astrophysics, surface physics and laser physics. Articles are written by distinguished experts, and contain both relevant review material and detailed descriptions of important recent developments. International experts Comprehensive articles New developments
Author: Donald Hylton White
Publisher:
ISBN:
Category : Quantum computers
Languages : en
Pages : 175
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Book Description
Quantum simulation is a burgeoning field of research, in which quantum systems are engineered to behave similarly to external, complex systems of interest. These quantum simulators are an alternative to the elusive all-purpose 'quantum computer' and instead function as analogue computers, allowing an external system of choice to be understood via measurements on a controllable engineered system. An important practical aspect of quantum mechanics concerns its effects on transport. This thesis describes a series of experiments with ultracold atoms in custom optical potentials, detailing quantum simulators developed for analysing the quantum transport properties of specific systems of interest. Two environments in particular are investigated: the quantum chaotic system of the deltakicked rotor, and a spatially disordered potential. The delta-kicked rotor investigations focus on the effects of phase modulation. By applying a periodic phase modulation of f0; 2 =3; 0g, the phase space is modified to generate a Hamiltonian ratchet, manifesting as directed transport within the chaotic sea without any biased force. We characterise the phase space by applying -classical theory, and capitalise on the narrow momentum distribution of a Bose-Einstein condensate by experimentally exploring the phase space. A sinusoidal phase modulation reveals two different transport regimes, dependent on the commensurability of the kicking frequency and phase modulation frequencies. We characterise the resonances found in the commensurate case, and study the effective phase noise induced in the incommensurate case. A particular finding of this investigation is that the quantum resonance is relatively robust to phase noise, while dynamical localisation is inhibited by small levels of phase noise. Finally, we implement a truly custom potential with high resolution imaging of a spatial light modulator, and develop a unique high aspect ratio 2D trap for quantum transport studies over long distances. We create custom spatially disordered channels as part of 'atomtronic' circuits to study the effect of disorder in a manner directly analogous to electronic systems. Through measurements of the effective channel resistances, we observe the first signatures of Anderson localisation in a 2D ultracold atom system.
Author: Supriyo Datta
Publisher: Cambridge University Press
ISBN: 1139443240
Category : Technology & Engineering
Languages : en
Pages : 434
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Book Description
This book presents the conceptual framework underlying the atomistic theory of matter, emphasizing those aspects that relate to current flow. This includes some of the most advanced concepts of non-equilibrium quantum statistical mechanics. No prior acquaintance with quantum mechanics is assumed. Chapter 1 provides a description of quantum transport in elementary terms accessible to a beginner. The book then works its way from hydrogen to nanostructures, with extensive coverage of current flow. The final chapter summarizes the equations for quantum transport with illustrative examples showing how conductors evolve from the atomic to the ohmic regime as they get larger. Many numerical examples are used to provide concrete illustrations and the corresponding Matlab codes can be downloaded from the web. Videostreamed lectures, keyed to specific sections of the book, are also available through the web. This book is primarily aimed at senior and graduate students.
Author: David K. Ferry
Publisher: CRC Press
ISBN: 1351796380
Category : Science
Languages : en
Pages : 538
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Book Description
Throughout their college career, most engineering students have done problems and studies that are basically situated in the classical world. Some may have taken quantum mechanics as their chosen field of study. This book moves beyond the basics to highlight the full quantum mechanical nature of the transport of carriers through nanoelectronic structures. The book is unique in that addresses quantum transport only in the materials that are of interest to microelectronics—semiconductors, with their variable densities and effective masses. The author develops Green’s functions starting from equilibrium Green’s functions and going through modern time-dependent approaches to non-equilibrium Green’s functions, introduces relativistic bands for graphene and topological insulators and discusses the quantum transport changes that these bands induce, and discusses applications such as weak localization and phase breaking processes, resonant tunneling diodes, single-electron tunneling, and entanglement. Furthermore, he also explains modern ensemble Monte Carlo approaches to simulation of various approaches to quantum transport and the hydrodynamic approaches to quantum transport. All in all, the book describes all approaches to quantum transport in semiconductors, thus becoming an essential textbook for advanced graduate students in electrical engineering or physics.
Author:
Publisher:
ISBN:
Category : Quantum theory
Languages : en
Pages : 155
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Book Description
Author: Sebastian Josef Krinner
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: A. K. M. Newaz
Publisher:
ISBN: 9781109886856
Category : Tunneling (Physics)
Languages : en
Pages : 171
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Book Description
I have studied experimentally the quantum transport in multiple-barrier resonant-tunneling devices, namely double-barrier resonant-tunneling diodes (DBRTD) and triple-barrier resonant-tunneling diodes (TBRTD), to understand the tunneling processes in multiple-barrier resonant structures. We have performed various types of transport measurements, such as current, conductance, resonant magnetotunneling spectroscopy and shot noise measurements at low temperature (T=4.2K).
Author: Fred Jendrzejewski
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
In this thesis we study the quantum transport of matter waves with ultracold atoms. Such ultracold atom systems provide a very good control and a high flexibility of the parameters of the systems like the interactions, its dimensionality and the external potentials. This makes them a great tool for the investigation of several fundamental concepts of condensed matter physics. We focus on the quantum transport in disordered media. It differs to classical transport by the fundamental role played by inference phenomena, which can eventually lead to the suppression of transport; known as Anderson Localization. Observing the expansion of a Bose-Einstein condensate in a strong light disorder, we show evidence for Localization of ultracold atoms in three dimensions. In the last part of this manuscript we discuss the observation of Coherent Backscattering of ultracold atoms, which is a direct signal of the role of quantum coherence in quantum transport in disordered media. We observe the time evolution of the momentum distribution of a cloud of ultra-cold atoms, launched with a narrow velocity distribution in a disordered potential. A peak emerges in the backwards direction, corresponding to the CBS signal.
