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Bernard Helffer

Identifiers

  • name variant Bernard Helffer 0.60 · backfill

Papers (57)

  1. Generic simplicity for self-adjoint operators under bounded potential perturbations math.SP · 2026 · author #2
  2. A Sharp Regularity Threshold for Uniqueness in Riemannian Calder\'on-type Problems math.AP · 2026 · author #3
  3. The fibre operators in the Bloch-Floquet decomposition of periodic magnetic pseudo-differential operators math.AP · 2025 · author #2
  4. Flux effects on Magnetic Laplace and Steklov eigenvalues in the exterior of a disk math.SP · 2025 · author #1
  5. Matrix representation of Magnetic pseudo-differential operators via tight Gabor frames math.AP · 2022 · author #2
  6. Courant-sharp Robin eigenvalues for the square -- the case with small Robin parameter-- math.SP · 2019 · author #2
  7. On the multiplicity of the second eigenvalue of the Laplacian in non simply connected domains--with some numerics-- math.SP · 2019 · author #1
  8. Courant-sharp Robin eigenvalues for the square and other planar domains math.SP · 2018 · author #2
  9. A Beals criterion for magnetic pseudodifferential operators proved with magnetic Gabor frames math.AP · 2018 · author #2
  10. Positive Hausdorff dimensional spectrum for the critical almost Mathieu operator math-ph · 2018 · author #1
  11. The spectrum of a Schr\"odinger operator in a wire-like domain with a purely imaginary degenerate potential in the semiclassical limit math-ph · 2018 · author #2
  12. On the semi-classical analysis of the groundstate energy of the Dirichlet Pauli operator III: Magnetic fields that change sign math.SP · 2017 · author #1
  13. The density of superconductivity in domains with corners math.AP · 2017 · author #1
  14. Spectral semi-classical analysis of a complex Schr\"odinger operator in exterior domains math-ph · 2017 · author #3
  15. Inequalities for the lowest magnetic Neumann eigenvalue math.SP · 2017 · author #2
  16. On a Schr\"odinger operator with a purely imaginary potential in the semiclassical limit math-ph · 2017 · author #3
  17. On the semi-classical analysis of the groundstate energy of the Dirichlet Pauli operator in non-simply connected domains math.SP · 2017 · author #1
  18. The density of superconductivity in the bulk regime math.AP · 2016 · author #1
  19. Low lying spectral gaps induced by slowly varying magnetic fields math.SP · 2016 · author #2
  20. On the semi-classical analysis of the groundstate energy of the Dirichlet Pauli operator math.SP · 2016 · author #1
  21. Pleijel's theorem for Schr\"odinger operators with radial potentials math.SP · 2016 · author #2
  22. Decay of superconductivity away from the magnetic zero set math.AP · 2016 · author #1
  23. On a magnetic characterization of spectral minimal partitions math.SP · 2015 · author #1
  24. Minimal partitions for anisotropic tori math.SP · 2015 · author #1
  25. A review on large k minimal spectral k-partitions and Pleijel's Theorem math.SP · 2015 · author #1
  26. Spectral minimal partitions for a thin strip on a cylinder or a thin annulus like domain with Neumann condition math.SP · 2015 · author #1
  27. Dirichlet eigenfunctions on the cube, sharpening the Courant nodal inequality math.SP · 2015 · author #1
  28. On nodal domains in Euclidean balls math.SP · 2015 · author #1
  29. Mixed normal-superconducting states in the presence of strong electric currents math-ph · 2015 · author #2
  30. Magnetic Wells in Dimension Three math-ph · 2015 · author #1
  31. Lower bound for the number of critical points of minimal spectral k-partitions for k large math.AP · 2015 · author #1
  32. From constant to non-degenerately vanishing magnetic fields in superconductivity math.AP · 2015 · author #1
  33. Eigenvalues for the Robin Laplacian in domains with variable curvature math.SP · 2014 · author #1
  34. Nodal domains in the square---the Neumann case math.SP · 2014 · author #1
  35. On the spectrum of non-selfadjoint Schr\"odinger operators with compact resolvent math-ph · 2014 · author #2
  36. The Ginzburg-Landau functional with vanishing magnetic field math.AP · 2014 · author #1
  37. Accurate semiclassical spectral asymptotics for a two-dimensional magnetic Schr\"odinger operator math.SP · 2013 · author #1
  38. Semiclassical spectral asymptotics for a magnetic Schr\"odinger operator with non-vanishing magnetic field math.SP · 2013 · author #1
  39. Global stability of the normal state of superconductors in the presence of a strong electric current math-ph · 2013 · author #2
  40. Eigenvalue estimates for a three-dimensional magnetic Schr\"odinger operator math.SP · 2012 · author #1
  41. Sharp trace asymptotics for a class of 2D-magnetic operators math-ph · 2011 · author #4
  42. Semiclassical spectral asymptotics for a two-dimensional magnetic Schr\"odinger operator II: The case of degenerate wells math.SP · 2011 · author #1
  43. Superconductivity between HC2 and HC3 math.SP · 2010 · author #2
  44. Magnetic calculus and semiclassical trace formulas math-ph · 2010 · author #1
  45. From resolvent bounds to semigroup bounds math.FA · 2010 · author #1
  46. Semiclassical spectral asymptotics for a two-dimensional magnetic Schr\"odinger operator: The case of discrete wells math.SP · 2010 · author #1
  47. Spectral properties of higher order anharmonic oscillators math.SP · 2009 · author #1
  48. Semiclassical analysis of Schr\"odinger operators with magnetic wells math.SP · 2008 · author #1
  49. Semiclassical reduction for magnetic Schroedinger operator with periodic zero-range potentials and applications math-ph · 2008 · author #1
  50. Spectral gaps for periodic Schr\"odinger operators with hypersurface magnetic wells math.SP · 2008 · author #1
  51. The periodic magnetic Schr\"odinger operators: spectral gaps and tunneling effect math.SP · 2007 · author #1
  52. Subelliptic estimates for some systems of complex vector fields : quasihomogeneous case math.AP · 2006 · author #2
  53. Compactness of the solution operator to d-bar in weighted L^2 - spaces math.CV · 2006 · author #2
  54. Semiclassical asymptotics and gaps in the spectra of periodic Schr\"odinger operators with magnetic wells math.SP · 2006 · author #1
  55. Semiclassical analysis of a nonlinear eigenvalue problem and non analytic hypoellipticity math.AP · 2003 · author #1
  56. Non-Linear Eigenvalues and Analytic Hypoellipticity math.AP · 2002 · author #2
  57. On bifurcations from normal solutions for superconducting states math-ph · 2000 · author #1

Mentions

  • 1411.2700 #1 · backfill · confidence 0.70 Bernard Helffer
  • 1410.6702 #1 · backfill · confidence 0.70 Bernard Helffer
  • 1410.5122 #2 · backfill · confidence 0.70 Bernard Helffer
  • 2605.31368 #2 · arxiv_oai · confidence 0.70 Bernard Helffer
  • 1407.0783 #1 · backfill · confidence 0.70 Bernard Helffer
  • 1312.5488 #1 · backfill · confidence 0.70 Bernard Helffer
  • 1311.6340 #1 · backfill · confidence 0.70 Bernard Helffer
  • 1310.1626 #2 · backfill · confidence 0.70 Bernard Helffer
  • 1203.4021 #1 · backfill · confidence 0.70 Bernard Helffer
  • 2605.21705 #3 · arxiv_oai · confidence 0.70 Bernard Helffer
  • 1108.0777 #4 · backfill · confidence 0.70 Bernard Helffer
  • 1103.4326 #1 · backfill · confidence 0.70 Bernard Helffer
  • 2512.22547 #2 · arxiv_oai · confidence 0.70 Bernard Helffer
  • 2212.12229 #2 · arxiv_oai · confidence 0.70 Bernard Helffer
  • 1804.05220 #2 · arxiv_oai · confidence 0.70 Bernard Helffer
  • 1005.4838 #2 · backfill · confidence 0.70 Bernard Helffer
  • 1005.1795 #1 · backfill · confidence 0.70 Bernard Helffer
  • 1001.4171 #1 · backfill · confidence 0.70 Bernard Helffer
  • 1001.1400 #1 · backfill · confidence 0.70 Bernard Helffer
  • 0912.0872 #1 · backfill · confidence 0.70 Bernard Helffer
  • 0812.5038 #1 · backfill · confidence 0.70 Bernard Helffer
  • 0802.1414 #1 · backfill · confidence 0.70 Bernard Helffer
  • 0801.4460 #1 · backfill · confidence 0.70 Bernard Helffer

Frequent Coauthors