WorldCat Identities

Leggett, A. J. (Anthony J.)

Overview
Works: 68 works in 164 publications in 5 languages and 2,383 library holdings
Genres: Popular works  Exhibition catalogs  Conference papers and proceedings  Interviews (Sound recordings)  Internet videos  Conversation and phrase books  Filmed interviews  Documentary films 
Roles: Author, Translator, Editor, Commentator, Other, Contributor
Classifications: QC21.2, 530
Publication Timeline
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Most widely held works about A. J Leggett
 
Most widely held works by A. J Leggett
The problems of physics by A. J Leggett( Book )

33 editions published between 1987 and 2009 in 4 languages and held by 932 WorldCat member libraries worldwide

Is the universe infinite, or does it have an edge beyond which there is, quite literally, nothing? Do we live in the only possible universe? Why does it have one time and three space dimensions--or does it? What is it made of? What does it mean when we hear a new particle has been discovered? In what sense is the behavior of complex bodies "merely a consequence" of that of their atomic constituents? Will quantum mechanics eventually give way to a totally new description of the world, one whose features we cannot even begin to imagine? This book aims to give the non-specialist reader a general overview of what physicists think they do and do not know in some representative frontier areas of contemporary physics. After sketching out the historical background, A.J. Leggett goes on to discuss the current situation and some of the open problems in cosmology, high-energy physics, and condensed-matter physics. This book focuses not so much on recent achievements as on the fundamental problems at the heart of the subject, and emphasizes the provisional nature of our present understanding of things
Quantum liquids : Bose condensation and Cooper pairing in condensed-matter systems by A. J Leggett( Book )

29 editions published between 2006 and 2015 in English and held by 354 WorldCat member libraries worldwide

Introducing the related phenomena of Bose condensation and Cooper pairing, in which a very large number of single particles or pairs of particles are forced to behave in exactly the same way, this book explores their consequences in condensed matter systems, eschewing advanced formal methods
Quantum computing and quantum bits in mesoscopic systems by A. J Leggett( Book )

11 editions published between 2003 and 2012 in English and held by 144 WorldCat member libraries worldwide

Quantum information science is a new field of science and technology which requires the collaboration of researchers coming from different fields of physics, mathematics, and engineering: both theoretical and applied. Quantum Computing and Quantum Bits in Mesoscopic Systems addresses fundamental aspects of quantum physics, enhancing the connection between the quantum behavior of macroscopic systems and information theory. In addition to theoretical quantum physics, the book comprehensively explores practical implementation of quantum computing and information processing devices. On the experimental side, this book reports on recent and previous observations of quantum behavior in several physical systems, coherently coupled Bose-Einstein condensates, quantum dots, superconducting quantum interference devices, Cooper pair boxes, and electron pumps in the context of the Josephson effect. In these systems, the book discusses all required steps, from fabrication through characterization to the final basic implementation for quantum computing
Quantum tunnelling in condensed media by I︠U︡ Kagan( Book )

9 editions published between 1992 and 2012 in English and held by 141 WorldCat member libraries worldwide

The essays in this book deal with of the problem of quantum tunnelling and related behavior of a microscopic or macroscopic system, which interacts strongly with an "environment"--This being some form of condensed matter. The "system" in question need not be physically distinct from its environment, but could, for example, be one particular degree of freedom on which attention is focussed, as in the case of the Josephson junction studied in several of the papers. This general problem has been studied in many hundreds, if not thousands, of articles in the literature, in contexts as diverse as biophysics and quantum cosmology. The editors have grouped together papers which are representative of the main trends in this area in the last fifteen years or so and sufficiently related in general spirit and terminology that common themes can be discerned. The contributions are primarily theoretical, but the comparison with experiment is discussed wherever possible
Qualitative methods in quantum theory by A. B Migdal( Book )

12 editions published between 1977 and 1989 in English and held by 46 WorldCat member libraries worldwide

Blown away by Ginger Gregg Duggan( Book )

2 editions published between 2007 and 2008 in English and held by 45 WorldCat member libraries worldwide

Nuclear theory; the quasiparticle method by A. B Migdal( Book )

3 editions published in 1968 in English and held by 34 WorldCat member libraries worldwide

The mental diet : the seven day program to change your life by A. J Leggett( Book )

1 edition published in 2011 in English and held by 6 WorldCat member libraries worldwide

The problems of physics by A. J Leggett( )

2 editions published between 2006 and 2007 in English and held by 5 WorldCat member libraries worldwide

The problems of physics : a conversation with Sir Anthony J. Leggett( Visual )

2 editions published in 2013 in English and held by 4 WorldCat member libraries worldwide

In 1987, Tony Leggett penned The Problems of Physics, acutely highlighting the key foundational problems of the age. 26 years later we sit down with Tony, now a Nobel Laureate, to see what has changed and what has stayed the same
Meteorological aspects of the Berringa fire of 25-26 February 1995 by A. J Leggett( Book )

1 edition published in 1996 in English and held by 3 WorldCat member libraries worldwide

"Weak" measurement of Quantum Mechanics: application to continuous measurement by A. J Leggett( )

3 editions published in 2012 in English and held by 3 WorldCat member libraries worldwide

Qing song zou bian jia na da by Qianqian Liu( Book )

1 edition published in 2010 in Chinese and held by 2 WorldCat member libraries worldwide

Time out of mind( Visual )

1 edition published in 2013 in English and held by 2 WorldCat member libraries worldwide

Physics Nobel Laureate Sir Anthony Leggett talks about the paradox of time's forward motion
Some problems in the theory of many-body systems by A. J Leggett( Book )

2 editions published in 1964 in English and held by 2 WorldCat member libraries worldwide

Point-contact Andreev reflection studies on superconductors by Xin Lu( )

1 edition published in 2010 in English and held by 2 WorldCat member libraries worldwide

Point-contact Andreev reflection spectroscopy (PCARS) and planar tunneling spectroscopy are used to investigate the density of states and superconducting gap structure of several novel superconducting systems. Theoretical and experimental background is given with an emphasis on PCARS as applied to various unconventional superconductors, such as NbSe$_2$, the borocarbide family RNi$_2$B$_2$C (R=Lu, Y) and the recently-discovered, iron-based superconductors AFe$_2$As$_2$ (A=Ba, Sr) with both hole and electron doping. The superconducting gap distribution observed from point-contacts on NbSe$_2$, with energies between 0.9 and 1.5 meV at 2 K, is consistent with the multigap scenario claimed by other experiments. The superconducting gap follows the BCS temperature dependence. PCARS probes a small gap anisotropy in both LuNi$_2$B$_2$C and YNi$_2$B$_2$C for the three major crystallographic orientations, while point-nodes are reported to exist in textit{a} and textit{b} axes and predicted to originate from the antiferromagnetic fluctuations due to nesting structure on the 17th band Fermi surface. This can be explained by the other Fermi surface sheets, with $Deltageq$2.1 meV in [100] direction, masking the point-node feature and resulting in a small gap anisotropy, as observed in our PCARS. A large tunneling cone in PCARS measurements, which would smear the differences in three directions, may be another origin of the observed small gap anisotropy. For the Fe-122 family of the iron-based superconductors, Andreev reflection is present for PCARS on (Ba$_{0.6}$K$_{0.4}$)Fe$_2$As$_2$ and Ba(Fe$_{0.9}$Co$_{0.1}$)$_2$As$_2$ crystals but measured conductances are distinct. A V-shape conductance valley (VCV) feature is observed for point-contacts on Sr(Fe$_{0.9}$Co$_{0.1}$)$_2$As$_2$ and (Sr$_{0.6}$Na$_{0.4}$)Fe$_2$As$_2$ crystals. This VCV feature is also observed for the non-superconducting parent compound BaFe$_2$As$_2$ and the superconducting (Ba$_{0.6}$K$_{0.4}$)Fe$_2$As$_2$ crystals. The coexistence of phase-separated magnetic and superconducting orders on the mesoscopic scale is considered to explain the range of behaviors in the superconducting samples
Some properties of the magnetic response of mesoscopic superconducting rings by Victor Ivanovich Vakaryuk( )

1 edition published in 2011 in English and held by 2 WorldCat member libraries worldwide

This thesis deals with two relatively independent topics pertinent to the physics of mesoscopic multiply connected superconducting samples (rings). In the first Chapter we consider a phenomenon of the entanglement of the center-of-mass and internal degrees of freedom of the Cooper pair which takes place when the size of the system becomes comparable to the characteristic decay length of the pair wave function. We show that this phenomenon provides a universal mechanism for distinguishing between odd and even parity center-of-mass states of the Cooper pair and, in particular, breaks hc/2e periodicity in observable quantities such as magnetic response. The violation of the hc/2e periodicity is usually attributed to the loss of superconductivity. Here we conclude that it is also possible in the superconducting state. In the subsequent Chapters we focus our attention on the topic of the half- quantum vortex. Such an object can exist in systems with spin triplet pairing in which the equal-spin-pairing state is realized. This state is found in the A-phase of 3 He and is currently believed to describe superconductivity of a strongly layered compound Sr2RuO4 . We show that a half-quantum vortex (HQV) should be accompanied by the kinematic spin polarization which is caused by the velocity mismatch between different superfluid components. We also suggest that under appropriate conditions the kinematic spin polarization can provide a handle on the stability of the HQV through the coupling to the external field. We then discuss how the sample⁰́₉s geometry affects the energetics of the HQV and derive its stability criterion for a cylindrical geometry with arbitrary cross-section. We propose that the presence of a constriction i.e. thinning in the walls of the cylinder can substantially improve the stability of HQV. Results of Chapter 1 and partially Chapter 2 have been presented in the following publications: V. Vakaryuk Phys. Rev. Lett. 101, 16 (Oct 2008), 167002; V. Vakaryuk, A.J. Leggett Phys. Rev. Lett. 103, 5 (Jul 2009), 057003
Dissipative processes in superconducting nanodevices: nanowire-resonators, shunted nanowires, and graphene proximity junctions by Matthew W Brenner( )

1 edition published in 2011 in English and held by 2 WorldCat member libraries worldwide

The topic of superconducting nanowires has recently been an interesting field of research which has included the study of the superconductor to insulator transition (SIT), the observation of macroscopic quantum behavior such as quantum phase slips (QPS), and the potential use of nanowires as qubits. Superconducting coplanar microwave waveguide resonators have also become a popular way of studying superconducting junctions and qubits, as they provide an extremely low noise environment. For example, superconducting two-dimensional Fabry-Perot resonators have been used by other groups to make non-demolition measurements of a qubit. The motivation of this thesis will be the merging of the fields of superconducting nanowires and the technique of using superconducting microwave resonators to study junctions by incorporating a nanowire into the resonator itself at a current anti-node. By doing this, the nonlinear effects of the nanowire can be studied which may find application in single photon detectors, mixers, and the readout of qubits. We also employ the technique of molecular templating to fabricate some of the thinnest superconducting nanowires ever studied (down to ~ 5 nm in diameter in some cases). In this thesis, we extend the understanding of the nonlinear properties of a nanowire- resonator system and investigate a new type of nonlinearity that involves a pulsing regime between the superconducting and normal phases of the nanowire. We develop a model, which describes the results quantitatively and by modeling the system, we are able to extract information regarding the relaxation time of the nanowire back into the superconducting state. We also study double nanowire-resonator systems where two closely spaced parallel nanowires interrupt the resonator center conductor and form a loop where vortex tunneling processes can occur. Using a double nanowire-resonator we are able to observe the Little-Parks effect at low temperatures (where the resistance of the wires is immeasurably low) and are able to confirm the multivalued nature of the current phase relationship (CPR) in nanowires. Additionally, we observe an anomalous transmission regime where the periodic pulsing is replaced by stochastic amplitude fluctuations. In addition to microwave measurements on nanowires, we also study the normal state in resistively shunted nanowires with dc measurements where the inclusion of a shunt resistor is observed to change the nature of the normal state from the Joule heated state to a state that preserves phase coherence. Finally, the statistics on switching current events in graphene proximity junctions are analyzed and compared to the well known results for Josephson junctions. Only thermal activation (and no macroscopic quantum tunneling) is observed in graphene proximity superconducting junctions down to temperatures of ~ 300 mK
Il mistero della superfluidità by A. J Leggett( Book )

1 edition published in 2009 in Italian and held by 2 WorldCat member libraries worldwide

Physical challenges of quantum computation by Man Hong Yung( )

1 edition published in 2010 in English and held by 2 WorldCat member libraries worldwide

This is a study of several physical challenges for building a quantum computer, a hypothetical device which is capable of accomplishing tasks unachievable by the classical model of computation. In chapter 1, we will give an overview of quantum computation and discuss the physical challenges for building a realistic quantum computer. In chapter 2, we shall explore the applications of quantum computation for the simulation of molecular quantum systems. In particular, an efficient algorithm for evaluating the partition function (and hence free energy) is proposed. In chapter 3, quantum information transfer over spin chains is then discussed. A proof about the most efficient way to transfer quantum information in one dimension is constructed. In chapter 4, we shall consider the effects of quantum correlation induced by quantum mechanical environments on the efficiency of the methods of quantum error correction. In chapter 5, we consider how the thermal noise affects the reliability of an adiabatic quantum computer
 
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The problems of physics
Alternative Names
Anthony J. Leggett

Anthony James Leggett fisico inglese

Anthony James Leggett fizyk brytyjski, noblista

Anthony James Leggett US-amerikanischer Physiker und Nobelpreisträger

Anthony Leggett

Anthony Leggett Amerikaans natuurkundige

Anthony Leggett professeur de physique à l'University of Illinois

Entoni Džejms Leget

Entoni Legget

Legget, Ė. Dž 1938-

Legget, Ėntoni Dž 1938-

Legget, Toni 1938-

Leggett, A. J.

Leggett, A. J. 1938-

Leggett, Anthony

Leggett, Anthony 1938-

Leggett, Anthony J.

Leggett, Anthony James

Leggett, Anthony James 1938-

Leggett, Antony J.

Leggett, Tony 1938-

Антъни Легет

Ентони Џејмс Легет

Ентони Џејмс Легет британски физичар

Ентоні Легетт

Леггетт, Энтони Джеймс

Энтані Джэймс Легет

آنتونی جیمز لگت

انتھونی جیمز لگٹ

أنطوني ليجت

اینتھنی جیمز لیگٹ

ئانتهۆنی ژامەس لەگگەتت

अँथोनी जेम्स लेगेट भौतिकशास्त्रातील नोबेल पारितोषिकविजेता शास्त्रज्ञ.

ए जे लेगेट

앤서니 레깃

アンソニー・レゲット

レゲット, アンソニー・J.

安東尼·萊格特

Languages
Covers
Quantum liquids : Bose condensation and Cooper pairing in condensed-matter systemsQuantum computing and quantum bits in mesoscopic systemsQuantum tunnelling in condensed mediaQualitative methods in quantum theory