Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of GothenburgSE951 papers
- Centre National de la Recherche ScientifiqueFR805 papers
- Leiden UniversityNL590 papers
- Max Planck Institute for Radio AstronomyDE405 papers
- European Southern ObservatoryCL356 papers
- Center for Astrophysics Harvard & SmithsonianUS313 papers
- Leiden Observatory304 papers
- California Institute of TechnologyUS296 papers
- National Astronomical Observatory of JapanJP280 papers
- Observatoire de ParisFR268 papers
- Stockholm UniversitySE262 papers
- Centro de AstrobiologíaES252 papers
26 papers · 1 filter
Aharonov-Bohm Oscillations in a One-Dimensional Wigner Crystal-Ring
I. V. Krive, R. I. Shekhter, S. M. Girvin +1
We calculate the magnetic moment (`persistent current') in a strongly correlated electron system --- a Wigner crystal --- in a one-dimensional ballistic ring. The flux and temperat…
Symmetries and Mean-Field Phases of the Extended Hubbard Model
A. B. Eriksson, T. Einarsson, S. Ostlund
The two-dimensional extended Hubbard model that includes a nearest- neighbor Heisenberg interaction is studied using a mean-field theory where quasiparticles are defined by an U(8)…
Schwinger Terms and Cohomology of Pseudodifferential Operators
Martin Cederwall, Gabriele Ferretti, Bengt E. W. Nilsson +1
We study the cohomology of the Schwinger term arising in second quantization of the class of observables belonging to the restricted general linear algebra. We prove that, for all…
Flicker Noise Induced by Dynamic Impurities in a Quantum Point Contact
J. P. Hessling, Yu. Galperin
We calculate low-frequency noise (LFN) in a quantum point contact (QPC) which is electrostatically defined in a 2D electron gas of a GaAs-AlGaAs heterostructure. The conventional s…
Noise in a Quantum Point Contact due to a Fluctuating Impurity Configuration
J. P. Hessling, Yu. Galperin, M. Jonson +2
We propose a theoretical model for the low-frequency noise observed in a quantum point contact (QPC) electrostatically defined in the 2D electron gas at a GaAs-AlGaAs interface. In…
General branching functions of affine Lie algebras
Stephen Hwang, Henric Rhedin
Explicit expressions are presented for general branching functions for cosets of affine Lie algebras with respect to subalgebras for the cases where the…
Thermal Versus Vacuum Magnetization in QED
Per Elmfors, Per Liljenberg, David Persson +1
The magnetized relativistic Fermi and Bose gases are studied at finite temperature and density.In the case of the Fermi gas, the contribution to the magnetization from the vacuum b…
Condensation and Magnetization of the Relativistic Bose Gas
P. Elmfors, P. Liljenberg, D. Persson +1
We present a simple proof of the absence of Bose--Einstein condensation of a relativistic boson gas, in any finite local magnetic field in less than five dimensions. We show that t…
SL(2,R) Yang-Mills theory on a circle
I. Bengtsson, J. Hallin
The kinematics of SL(2,R) Yang-Mills theory on a circle is considered, for reasons that are spelled out. The gauge transformations exhibit hyperbolic fixed points, and this results…
Influence of Long-Range Coulomb Forces and Dissipation on the Persistent Current of a Wigner Crystal-Ring
I. V. Krive, P. Sandström, R. I. Shekhter +1
The influence of long-range Coulomb forces on the persistent current of a pinned Wigner crystal-ring is considered. A simple method is proposed for how to take into account Coulomb…
Influence of Long-Range Coulomb Interactions on the Metal-Insulator Transition in One-Dimensional Strongly Correlated Electron Systems
I. V. Krive, A. A. Nersesyan, M. Jonson +1
The influence of long-range Coulomb interactions on the properties of one-dimensional (1D) strongly correlated electron systems in vicinity of the metal-insulator phase transition…
Regularization and Quantization of Higher Dimensional Current Algebras
G. Ferretti
We present some recently discovered infinite dimensional Lie algebras that can be understood as extensions of the algebra Map(M,g) of maps from a compact p-dimensional manifold to…
Superparticle actions from superfields
R. Marnelius, Sh. M. Shvartsman
Gauge invariant complex covariant actions for superparticles are derived from the field equations for the chiral superfields in a precise manner. The massive and massless cases in…
The Twisted String Vertex Algorithm Applied to the -Twisted Scalar String Four Vertex
Niclas Engberg, Bengt E. W. Nilsson, Anders Westerberg
Recently an algorithm was found by means of which one can calculate terms at arbitrary oscillator level in the four-Ramond vertex obtained by sewing. Here we show that this algorit…
Further results on Functional Determinants of Laplacians in Simplicial Complexes
Erik Aurell, Per Salomonson
We investigate the functional determinant of the laplacian on piece-wise flat two-dimensional surfaces, with conical singularities in the interior and/or corners on the boundary. O…
Non-Equilibrium Magnetization in a Ballistic Quantum Dot
T. Swahn, E. N. Bogachek, Yu. M. Galperin +2
We show that Aharonov-Bohm (AB) oscillations in the magnetic moment of an integrable ballistic quantum dot can be destroyed by a time dependent magnetic flux. The effect is due to…
Soft Disorder Effects in the Conductance Quantization in Quantum Point Contacts: Indirect Backscattering Statistics
A. M. Zagoskin, S. N. Rashkeev, R. I. Shekhter +1
The breakdown of conductance quantization in a quantum point contact in the presence of random long-range impurity potential is discussed. It is shown that in the linear response r…
Gapless Phases in an s=1/2 Quantum Spin Chain with Bond Alternation
A. A. Nersesyan, A. Luther
The XXZ spin chain with the staggered XY anisotropy $$ H = J \sum_{n}^{N} (S^{x}_{n} S^{x}_{n+1} + S^{y}_{n} S^{y}_{n+1} + ΔS^{z}_{n} S^{z}_{n+1}) - δ\sum_{n}^{N} (-1)^{n}…
A Note on QED with Magnetic Field and Chemical Potentia
D. Persson, Vad. Zeitlin
Using a generalized proper-time method, we obtain expressions for the fermion density and the QED effective Lagrangian for an external magnetic field at finite chemical potential.…
Electromagnetic Fields in a Thermal Background
Per Elmfors, Bo-Sture Skagerstam
The one--loop effective action for a slowly varying electromagnetic field is computed at finite temperature and density using a real-time formalism. We discuss the gauge invariance…
Towards a Complete Twistorization of the Heterotic String
Igor A. Bandos, Martin Cederwall, Dmitrij P. Sorokin +1
In and 10 space--time dimensions considered is a string model invariant under transformations of space--time supersymmetry and local worldsheet supersymmetr…
Spectroscopy of the Potential Profile in a Ballistic Quantum Constriction
I. E. Aronov, M. Jonson, A. M. Zagoskin
We present a theory for the nonlinear current-voltage characteristics of a ballistic quantum constriction. Nonlinear features first develop because of above-barrier reflection from…
Nonlinear Transport in a Quantum Point Contact due to Soft Disorder Induced Coherent Mode Mixing
A. M. Zagoskin, R. I. Shekhter
We show that the coherent mixing of different transverse modes, due to forward scattering of carriers by soft impurity- or boundary potentials leads to a nonlinear, asymmetric curr…
Disorder Effects in Two-Dimensional d-wave Superconductors
A. A. Nersesyan, A. M. Tsvelik, F. Wenger
Influence of weak nonmagnetic impurities on the single-particle density of states of two-dimensional electron systems with a conical spectrum is studied. We use a nonperturb…