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Beautiful Models
70 Years Of Exactly Solved Quantum Many-body Problems
By: Bill Sutherland
Hardcover | 22 June 2004
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400 Pages
22.86 x 15.88 x 1.91
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This invaluable book provides a broad introduction to the fascinating and beautiful subject of many-body quantum systems that can be solved exactly. The subject began with Bethe's famous solution of the one-dimensional Heisenberg magnet more than 70 years ago, soon after the invention of quantum mechanics. Since then, the diversity and scope of such systems have been steadily growing.Beautiful Models is self-contained and unified in presentation. It may be used as an advanced textbook by graduate students and even ambitious undergraduates in physics. It is also suitable for the non-experts in physics who wish to have an overview of some of the classic and fundamental models in the subject. The explanations in the book are detailed enough to capture the interest of the curious reader, and complete enough to provide the necessary background material needed to go further into the subject and explore the research literature.
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| Preface | p. vii |
| Overview | p. 1 |
| Orientation | p. 1 |
| An experiment--ballistic expansion | p. 6 |
| One dimension versus two or three dimensions | p. 8 |
| Quantum mechanics | p. 12 |
| The essence of the Bethe ansatz | p. 12 |
| A simple example--the 1/r[superscript 2] potential | p. 15 |
| References and history | p. 18 |
| Integrability and Nondiffraction | p. 27 |
| What does it mean to say that a system is integrable? | p. 27 |
| Scattering without diffraction | p. 30 |
| Proof of integrability for the hyperbolic potential | p. 36 |
| The potentials | p. 36 |
| Proof of integrability | p. 38 |
| The asymptotic momenta are conserved | p. 42 |
| The [delta]-function potential | p. 44 |
| Adding periodic boundary conditions | p. 45 |
| This is not a low-density approximation | p. 49 |
| Techniques | p. 53 |
| Our fundamental equation | p. 53 |
| The ground state | p. 54 |
| Response of the ground state | p. 61 |
| Excitations near the ground state | p. 64 |
| Zero-temperature thermodynamics | p. 68 |
| Finite temperature thermodynamics | p. 70 |
| The inverse-square potential--an example | p. 72 |
| The Classical Limit | p. 75 |
| Classical diffraction--pictures from an exhibition | p. 75 |
| The classical limit | p. 90 |
| Classical system at zero temperature | p. 93 |
| The inverse-square limit--example 1 | p. 95 |
| The Toda limit--example 2 | p. 97 |
| Solitons and constant profile solutions | p. 100 |
| Groundstate Wavefunctions of Product Form | p. 102 |
| An ansatz for the ground state wavefunction | p. 102 |
| Motivation for the product form | p. 103 |
| An inverse problem | p. 104 |
| The trigonometric case | p. 106 |
| Details | p. 108 |
| Excited states for the trigonometric case | p. 109 |
| Summary | p. 109 |
| A transformation | p. 110 |
| Change of basis | p. 111 |
| Off-diagonal elements of H' | p. 113 |
| Energy eigenvalues | p. 114 |
| Validity of the asymptotic Bethe ansatz | p. 115 |
| An example | p. 116 |
| Ground state correlations for the trigonometric case | p. 116 |
| The normalization constant | p. 116 |
| Analogy with a classical plasma | p. 118 |
| Important correlation functions | p. 119 |
| Correlations for special values of [lambda] | p. 123 |
| The Heisenberg-Ising Model | p. 131 |
| The model and its symmetries | p. 131 |
| The model | p. 131 |
| Rotational symmetry | p. 132 |
| Translational symmetry | p. 132 |
| Ground state in the thermodynamic limit | p. 133 |
| Other models | p. 134 |
| Quantum lattice gas | p. 134 |
| Statistics of the lattice gas | p. 135 |
| Twisted lattice gas | p. 137 |
| What we are going to find--a preview | p. 138 |
| Bethe's ansatz | p. 143 |
| The wavefunction | p. 143 |
| Well-separated particles | p. 143 |
| Near-neighbors | p. 144 |
| Two-body phase shift [theta] | p. 145 |
| Periodic boundary conditions | p. 145 |
| Twisted boundary conditions and recapitulation | p. 146 |
| The dilute limit M [double less-than sign] N | p. 146 |
| M = 0 | p. 146 |
| M = 1 | p. 146 |
| M = 2 | p. 148 |
| A change of variables | p. 154 |
| [Delta less than sign] -1, antiferromagnet | p. 154 |
| 1 [greater than sign Delta greater than sign] -1, paramagnet | p. 155 |
| [Delta] = -1, Heisenberg antiferromagnet | p. 155 |
| The ground state | p. 157 |
| Preliminaries | p. 157 |
| Half-filled lattice | p. 158 |
| [Delta] = -cosh [lambda less than sign] -1, antiferromagnet | p. 159 |
| 1 [greater than sign Delta] = -cos [mu greater than sign] -1, paramagnet | p. 160 |
| [Delta] = -1, Heisenberg antiferromagnet | p. 161 |
| Perturbations and excitations of the ground state | p. 161 |
| The general results | p. 162 |
| Half-filling | p. 166 |
| [Delta less than sign] -1, antiferromagnet | p. 167 |
| 1 [greater than sign Delta greater than sign] -1, paramagnet | p. 168 |
| [Delta] = -1, Heisenberg antiferromagnet | p. 168 |
| Zero-temperature thermodynamics | p. 170 |
| Fundamental integral equation | p. 170 |
| Near half-filling | p. 171 |
| The function [kappa] | p. 172 |
| Evaluation for the paramagnet | p. 174 |
| Evaluation for the antiferromagnet | p. 177 |
| What do our calculations really mean? | p. 178 |
| The low-density limit and complex solutions | p. 180 |
| M-strings | p. 180 |
| Dispersion relations | p. 182 |
| Boosting the bound states | p. 184 |
| Further results | p. 186 |
| Consistency | p. 189 |
| How can we show integrability? | p. 189 |
| The direct approach | p. 189 |
| The constructive approach | p. 190 |
| The indirect approach | p. 192 |
| How can we show non-integrability? | p. 193 |
| Consistency conditions | p. 197 |
| Solution to consistency conditions | p. 205 |
| Two components, conjugation symmetry | p. 205 |
| Consistency conditions | p. 205 |
| Necessary conditions for r and t | p. 208 |
| Bound states | p. 210 |
| Two components, different statistics | p. 213 |
| Three or more components | p. 215 |
| Periodic and twisted boundary conditions | p. 217 |
| Eigenvectors of the transfer matrix, two-components | p. 220 |
| The basic equations | p. 220 |
| The winding matrix and the transfer operator | p. 222 |
| Twisted boundary conditions | p. 224 |
| Properties of the winding matrix and the transfer operator | p. 225 |
| Eigenvalues | p. 228 |
| Explicit expressions for the equations | p. 230 |
| Solution to the general problem | p. 231 |
| Eigenvectors of the transfer matrix: multicomponent system | p. 232 |
| Basic equations | p. 233 |
| The winding matrix and the transfer operator | p. 235 |
| Properties of the winding matrix and the transfer operator | p. 236 |
| Eigenvalues | p. 238 |
| Summary of results | p. 242 |
| The constructive approach | p. 242 |
| Exchange Models | p. 244 |
| Hyperbolic exchange models | p. 245 |
| Integrability | p. 246 |
| The two-body phase shifts | p. 248 |
| The inverse-square exchange potential | p. 249 |
| The [delta]-function potential | p. 253 |
| The case F[superscript 2]--repulsive | p. 254 |
| The case B[superscript 2] | p. 256 |
| The case F[superscript 2]--attractive | p. 258 |
| The case BF | p. 261 |
| The Sinh-Cosh Model | p. 262 |
| The sinh-cosh potential | p. 262 |
| Integrability | p. 263 |
| The two-body problem | p. 265 |
| Phase shifts | p. 267 |
| Spin waves | p. 269 |
| Solution and results for zero temperature and zero spin/charge | p. 270 |
| Exchange Lattice Systems by Freezing | p. 275 |
| Freezing continuum models to give lattice models | p. 275 |
| Review of the continuum exchange model | p. 277 |
| The limit [lambda] to [infinity] | p. 279 |
| The first order equation | p. 280 |
| The densities [rho](x) and e(x) | p. 282 |
| Results for the nearest-neighbor model | p. 284 |
| Results for the hyperbolic model | p. 286 |
| The inverse-square lattice at finite temperature | p. 289 |
| The Hubbard Model | p. 295 |
| The model and its symmetries | p. 295 |
| The model | p. 295 |
| Other statistics | p. 296 |
| The phase diagram and symmetries | p. 298 |
| Bethe's ansatz | p. 299 |
| The wavefunction | p. 299 |
| Well-separated particles | p. 300 |
| Double occupancy | p. 300 |
| Two-body scattering amplitudes | p. 302 |
| A change of variables | p. 303 |
| The repulsive case | p. 304 |
| The fundamental equations | p. 304 |
| The ground state | p. 305 |
| The attractive case | p. 308 |
| The bound state | p. 308 |
| Consistency conditions and the scattering of pairs | p. 312 |
| A fluid of pairs | p. 313 |
| Ground state properties at the symmetric point | p. 314 |
| Excitations at the symmetric point | p. 314 |
| Ground state response | p. 314 |
| Holes and particles in the fluid of pairs | p. 315 |
| Unbound particles | p. 316 |
| Some Two-Body Problems | p. 319 |
| The two-body problem | p. 319 |
| The potential v(r) = c[delta](r) | p. 324 |
| The potential v(r) = [lambda]([lambda] - 1)/r[superscript 2] | p. 326 |
| The potential v(r) = [lambda]([lambda] - 1)/sinh[superscript 2]r | p. 327 |
| The potential v(r) = -[lambda]([lambda] - 1)/cosh[superscript 2]r | p. 331 |
| Combination potentials | p. 336 |
| Representations | p. 338 |
| The permutation group | p. 338 |
| The twisted permutation group | p. 342 |
| Two ways to write the Bethe ansatz | p. 345 |
| Two-body scattering | p. 347 |
| The consistency conditions | p. 349 |
| Representations | p. 350 |
| Twisted boundary conditions | p. 353 |
| Realizations | p. 360 |
| Lattice gases | p. 360 |
| Other realizations | p. 363 |
| Nearest-neighbor hopping | p. 365 |
| Periodic boundary conditions | p. 368 |
| Bibliography | p. 371 |
| Index | p. 377 |
| Table of Contents provided by Rittenhouse. All Rights Reserved. |
ISBN: 9789812388599
ISBN-10: 9812388591
Published: 22nd June 2004
Format: Hardcover
Language: English
Number of Pages: 400
Audience: College, Tertiary and University
Publisher: World Scientific Publishing Co Pte Ltd
Country of Publication: GB
Dimensions (cm): 22.86 x 15.88 x 1.91
Weight (kg): 0.7
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