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SIAM Review

Solvable Models in Quantum Mechanics (S. Albeverio, F. Gesztesy, R. Hoegh-Krohn, and H. Holden)

F. H. Brownell

Published Mar 1, 1990• 2 citations
Publisher

Abstract

Previous article Next article Solvable Models in Quantum Mechanics (S. Albeverio, F. Gesztesy, R. Hoegh-Krohn, and H. Holden)F. H. BrownellF. H. Brownellhttps://doi.org/10.1137/1032018PDFBibTexSections ToolsAdd to favoritesExport CitationTrack CitationsEmail SectionsAbout[1] H. Weyl, Ramifications, old and new, of the eigenvalue problem, Bull. Amer. Math. Soc., 56 (1950), 115–139 11,666i 0041.21003 CrossrefISIGoogle Scholar[2] F. H. Brownell, Spectrum of the static potential Schrödinger equation over $E\sb n$, Ann. of Math. (2), 54 (1951), 554–594 13,847a 0044.42703 CrossrefISIGoogle Scholar[3] F. A. Berezin and , L. D. Faddeev, A remark on Schrödinger's equation with a singular potential, Soviet Math. Dokl., 2 (1961), 372–375 0117.06601 Google Scholar[4] C. N. Friedman, Perturbations of the Schröedinger equation by potentials with small support, J. Functional Analysis, 10 (1972), 346–360 10.1016/0022-1236(72)90033-X 49:5529 0235.35009 CrossrefGoogle Scholar[5] F. H. Brownell, Real variables and Hilbert space operators for scientists, University Microfilms International, Ann Arbor, MI, 1978 Google Scholar Previous article Next article FiguresRelatedReferencesCited byDetails On the relation between two different methods to treat Hamiltonians with point interactionsIntegral Equations and Operator Theory, Vol. 14, No. 3 Cross Ref Volume 32, Issue 1| 1990SIAM Review History Published online:18 July 2006 InformationCopyright © 1990 Society for Industrial and Applied MathematicsPDF Download Article & Publication DataArticle DOI:10.1137/1032018Article page range:pp. 160-167ISSN (print):0036-1445ISSN (online):1095-7200Publisher:Society for Industrial and Applied Mathematics

DOI
10.1137/1032018

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This issue comprises two dozen research papers which are all in one sense or another devoted to models in which the interaction is singular and sharply localized; a typical example is a quantum particle interacting with a family of δ-type potentials. Such an idealization usually makes analysis of their properties considerably easier, sometimes allowing us to reduce it to a simple algebraic problem—this is why one speaks about solvable models. The subject can be traced back to the early days of quantum mechanics; however, the progress in this field was slow and uneven until the 1960s, mostly because singular interactions are often difficult to deal with mathematically and intuitive arguments do not work. After overcoming the initial difficulties the `classical' theory of point interactions was developed, and finally summarized in 1988 in a monograph by Albeverio, Gesztesy, Høegh-Krohn, and Holden, which you will find quoted in numerous places within this issue. A reliable way to judge theories is to observe the progress they make within one or two decades. In this case there is no doubt that the field has witnessed a continuous development and covered areas which nobody had thought of when the subject first emerged. The reader may see it in the second edition of the aforementioned book which was published by AMS Chelsea only recently and contained a brief survey of these new achievements. It is no coincidence that this topical issue appears at the same time; it has been conceived as its counterpart and a forum at which fresh results in the field can demonstrated. Let us briefly survey the contents of the issue. While the papers included have in common the basic subject, they represent a broad spectrum philosophically as well as technically, and any attempt to classify them is somewhat futile. Nevertheless, we will divide them into a few groups. The first comprises contributions directly related to the usual point-interaction ideology. M Correggi and one of the editors study a toy model of a decay under the influence of a time-periodic δ potential. E Demiralp describes the spectrum of a spherical harmonic oscillator amended with a concentric family of δ-shell interactions. Another of the editors presents an isoperimetric problem for point interactions arranged at vertices of a polygon. W Huddell and R Hughes show how singular perturbations of a one-dimensional Dirac operator can be approximated by regular potentials, and J Brasche constructs a family of Hamiltonians in which the singular interaction has a more complicated support, namely a Brownian path. Finally, B Pavlov and I Antoniou apply the singular perturbation technique to another classical Hamiltonian, that of a generalized Friedrichs model; no matter that the unperturbed observable is called momentum in their paper. The three papers in the following group are distinguished by the fact that they consider systems which are fully or partially periodic. F Bentosela and M Tater analyse scattering on a crystalline `slab' modelled by point interactions distributed periodically on a finite number of parallel plates. E de Prunelé studies evolution of wavepackets in crystal models of different geometries, and M Avdonin et al discuss a simple model of a spin-dependent scattering on a one-dimensional array of quantum dots. The next group of papers is devoted to a topic which was untouched at the time of the aforementioned first edition, namely quantum graphs, which became a subject of interest after numerous applications of such systems to semiconductor, carbon and other nanostructures. Most contributions here deal with the `usual' model in which the Hamiltonian is a Schrödinger operator supported by the graph. P Kuchment describes spectral properties of such graphs, in particular periodic ones and those with decorations. S Albeverio and K Pankrashkin present a modification of Krein's formula which is suitable for constructing Hamiltonians of quantum graphs using boundary conditions at vertices directly. Two papers are devoted to inverse problems in this context: M Harmer studies inverse scattering for the matrix Schrödinger operator on the halfline with applications to star graphs, while P Kurasov and M Nowaczyk give a mathematically rigorous version of the known Gutkin–Smilansky result on the inverse spectral problem. The paper by O Post contributes to the question of how graphs can be approximated by more realistic `fat' graphs, and describes a class leading to disconnected quantum graphs. Finally, S Kondej and one of the editors study scattering in the context of `leaky' graphs which takes quantum tunnelling into account. While most results in this field describe one-particle Hamiltonians, more complicated systems have also been studied. In this issue we have three examples. C Cacciapuito, R Carlone, and R Figari discuss decoherence in a simple model of two particles, one heavy and one light, interacting through a δ potential; they give a rigorous meaning to a formula derived by Joos and Zeh. A related model by R Figari and A Teta is used to describe ionization. M Hallnäs, E Langmann, and C Paufler treat a true N -body situation, namely a model of one-dimensional gas of distinguishable particles interacting through generalized point interactions; they write the Bethe ansatz and present the solution of a particular case. The last group is a collection of contributions which in one sense or another are outside quantum mechanics, either modifying its postulates or applying it to a different physical situation. The latter applies to the paper of D Noja and A Posilicano in which they study nonlinear wave equations with point perturbations and show the existence of a solution to the Cauchy problem. F Coutinho et al discuss one-dimensional point interactions with energy-dependent coupling constant, S Albeverio and S Kuzhel examine a class of point interactions which are not symmetric but P-symmetric, where P is the parity operator, and M Znojil and V Jakubský consider a `double-well' PT-symmetric model with two δ interactions with an imaginary coupling. The last two papers present mathematical constructions. Yu Shondin demonstrates a way to define an interaction more singular than the usual δ potentials obtained by means of self-adjoint extensions, and V Koshmanenko presents a construction of strongly singular perturbations leading to rather unusual `Hamiltonians'.

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Previous article Next article Solvable Models in Quantum Mechanics (S. Albeverio, F. Gesztesy, R. Hoegh-Krohn, and H. Holden)F. H. BrownellF. H. Brownellhttps://doi.org/10.1137/1032018PDFBibTexSections ToolsAdd to favoritesExport CitationTrack CitationsEmail SectionsAbout[1] H. Weyl, Ramifications, old and new, of the eigenvalue problem, Bull. Amer. Math. Soc., 56 (1950), 115–139 11,666i 0041.21003 CrossrefISIGoogle Scholar[2] F. H. Brownell, Spectrum of the static potential Schrödinger equation over E\sbnE\sb nE\sbn, Ann. of Math. (2), 54 (1951), 554–594 13,847a 0044.42703 CrossrefISIGoogle Scholar[3] F. A. Berezin and , L. D. Faddeev, A remark on Schrödinger's equation with a singular potential, Soviet Math. Dokl., 2 (1961), 372–375 0117.06601 Google Scholar[4] C. N. Friedman, Perturbations of the Schröedinger equation by potentials with small support, J. Functional Analysis, 10 (1972), 346–360 10.1016/0022-1236(72)90033-X 49:5529 0235.35009 CrossrefGoogle Scholar[5] F. H. Brownell, Real variables and Hilbert space operators for scientists, University Microfilms International, Ann Arbor, MI, 1978 Google Scholar Previous article Next article FiguresRelatedReferencesCited byDetails On the relation between two different methods to treat Hamiltonians with point interactionsIntegral Equations and Operator Theory, Vol. 14, No. 3 Cross Ref Volume 32, Issue 1| 1990SIAM Review History Published online:18 July 2006 InformationCopyright © 1990 Society for Industrial and Applied MathematicsPDF Download Article & Publication DataArticle DOI:10.1137/1032018Article page range:pp. 160-167ISSN (print):0036-1445ISSN (online):1095-7200Publisher:Society for Industrial and Applied Mathematics
This issue comprises two dozen research papers which are all in one sense or another devoted to models in which the interaction is singular and sharply localized; a typical example is a quantum particle interacting with a family of δ-type potentials. Such an idealization usually makes analysis of their properties considerably easier, sometimes allowing us to reduce it to a simple algebraic problem—this is why one speaks about solvable models. The subject can be traced back to the early days of quantum mechanics; however, the progress in this field was slow and uneven until the 1960s, mostly because singular interactions are often difficult to deal with mathematically and intuitive arguments do not work. After overcoming the initial difficulties the `classical' theory of point interactions was developed, and finally summarized in 1988 in a monograph by Albeverio, Gesztesy, Høegh-Krohn, and Holden, which you will find quoted in numerous places within this issue. A reliable way to judge theories is to observe the progress they make within one or two decades. In this case there is no doubt that the field has witnessed a continuous development and covered areas which nobody had thought of when the subject first emerged. The reader may see it in the second edition of the aforementioned book which was published by AMS Chelsea only recently and contained a brief survey of these new achievements. It is no coincidence that this topical issue appears at the same time; it has been conceived as its counterpart and a forum at which fresh results in the field can demonstrated. Let us briefly survey the contents of the issue. While the papers included have in common the basic subject, they represent a broad spectrum philosophically as well as technically, and any attempt to classify them is somewhat futile. Nevertheless, we will divide them into a few groups. The first comprises contributions directly related to the usual point-interaction ideology. M Correggi and one of the editors study a toy model of a decay under the influence of a time-periodic δ potential. E Demiralp describes the spectrum of a spherical harmonic oscillator amended with a concentric family of δ-shell interactions. Another of the editors presents an isoperimetric problem for point interactions arranged at vertices of a polygon. W Huddell and R Hughes show how singular perturbations of a one-dimensional Dirac operator can be approximated by regular potentials, and J Brasche constructs a family of Hamiltonians in which the singular interaction has a more complicated support, namely a Brownian path. Finally, B Pavlov and I Antoniou apply the singular perturbation technique to another classical Hamiltonian, that of a generalized Friedrichs model; no matter that the unperturbed observable is called momentum in their paper. The three papers in the following group are distinguished by the fact that they consider systems which are fully or partially periodic. F Bentosela and M Tater analyse scattering on a crystalline `slab' modelled by point interactions distributed periodically on a finite number of parallel plates. E de Prunelé studies evolution of wavepackets in crystal models of different geometries, and M Avdonin et al discuss a simple model of a spin-dependent scattering on a one-dimensional array of quantum dots. The next group of papers is devoted to a topic which was untouched at the time of the aforementioned first edition, namely quantum graphs, which became a subject of interest after numerous applications of such systems to semiconductor, carbon and other nanostructures. Most contributions here deal with the `usual' model in which the Hamiltonian is a Schrödinger operator supported by the graph. P Kuchment describes spectral properties of such graphs, in particular periodic ones and those with decorations. S Albeverio and K Pankrashkin present a modification of Krein's formula which is suitable for constructing Hamiltonians of quantum graphs using boundary conditions at vertices directly. Two papers are devoted to inverse problems in this context: M Harmer studies inverse scattering for the matrix Schrödinger operator on the halfline with applications to star graphs, while P Kurasov and M Nowaczyk give a mathematically rigorous version of the known Gutkin–Smilansky result on the inverse spectral problem. The paper by O Post contributes to the question of how graphs can be approximated by more realistic `fat' graphs, and describes a class leading to disconnected quantum graphs. Finally, S Kondej and one of the editors study scattering in the context of `leaky' graphs which takes quantum tunnelling into account. While most results in this field describe one-particle Hamiltonians, more complicated systems have also been studied. In this issue we have three examples. C Cacciapuito, R Carlone, and R Figari discuss decoherence in a simple model of two particles, one heavy and one light, interacting through a δ potential; they give a rigorous meaning to a formula derived by Joos and Zeh. A related model by R Figari and A Teta is used to describe ionization. M Hallnäs, E Langmann, and C Paufler treat a true N -body situation, namely a model of one-dimensional gas of distinguishable particles interacting through generalized point interactions; they write the Bethe ansatz and present the solution of a particular case. The last group is a collection of contributions which in one sense or another are outside quantum mechanics, either modifying its postulates or applying it to a different physical situation. The latter applies to the paper of D Noja and A Posilicano in which they study nonlinear wave equations with point perturbations and show the existence of a solution to the Cauchy problem. F Coutinho et al discuss one-dimensional point interactions with energy-dependent coupling constant, S Albeverio and S Kuzhel examine a class of point interactions which are not symmetric but P-symmetric, where P is the parity operator, and M Znojil and V Jakubský consider a `double-well' PT-symmetric model with two δ interactions with an imaginary coupling. The last two papers present mathematical constructions. Yu Shondin demonstrates a way to define an interaction more singular than the usual δ potentials obtained by means of self-adjoint extensions, and V Koshmanenko presents a construction of strongly singular perturbations leading to rather unusual `Hamiltonians'.
Previous article Next article Scattering Theory by the Enss Method (Peter A. Perry) (B. Simon, ed.)George A. HagedornGeorge A. Hagedornhttps://doi.org/10.1137/1027082PDFBibTexSections ToolsAdd to favoritesExport CitationTrack CitationsEmail SectionsAbout"Scattering Theory by the Enss Method (Peter A. Perry) (B. Simon, ed.)." SIAM Review, 27(2), pp. 274–275[1] Volker Enss, Asymptotic completeness for quantum mechanical potential scattering. I. Short range potentials, Comm. Math. Phys., 61 (1978), 285–291 58:25583 0389.47005 CrossrefISIGoogle Scholar[2] Volker Enss, P. Blanchard, Completeness of three-body quantum scatteringDynamics and processes (Bielefeld, 1981), Lecture Notes in Math., Vol. 1031, Springer, Berlin, 1983, 62–88, Heidelberg–New York 85h:81071 0531.47009 CrossrefGoogle Scholar[3] P. Lax and , R. S. Phillips, Scattering theory, Pure and Applied Mathematics, Vol. 26, Academic Press, New York, 1967xii+276 pp. (1 plate) 36:530 0186.16301 Google Scholar Previous article Next article FiguresRelatedReferencesCited byDetails Volume 27, Issue 2| 1985SIAM Review History Published online:02 August 2006 InformationCopyright © 1985 © Society for Industrial and Applied MathematicsPDF Download Article & Publication DataArticle DOI:10.1137/1027082Article page range:pp. 274-275ISSN (print):0036-1445ISSN (online):1095-7200Publisher:Society for Industrial and Applied Mathematics
Previous article Next article Variational Problem for Overlapping Laser Pulses (C. E. Carroll)David AllwrightDavid Allwrighthttps://doi.org/10.1137/1034060PDFBibTexSections ToolsAdd to favoritesExport CitationTrack CitationsEmail SectionsAbout[1] C. E. Carroll, Minimum area for complete inversion of a three-state atom, Phys. Rev., A 39 (1989), 2243–2244 10.1103/PhysRevA.39.2243 CrossrefISIGoogle Scholar Previous article Next article FiguresRelatedReferencesCited ByDetails From Snell’s law to Fermat’s principleJournal of Sound and Vibration, Vol. 536 | 1 Oct 2022 Cross Ref Volume 34, Issue 2| 1992SIAM Review History Published online:02 August 2006 InformationCopyright © 1992 © Society for Industrial and Applied MathematicsPDF Download Article & Publication DataArticle DOI:10.1137/1034060Article page range:pp. 310-312ISSN (print):0036-1445ISSN (online):1095-7200Publisher:Society for Industrial and Applied Mathematics