### Jorge E. Hirsch

Professor of physics
University of California, San Diego
E-mail: jhirsch@ucsd.edu
Tel: 858-534-3931

Publication list
Physicists letter to Congress (Feb. 1, 2007)

Theory of hole superconductivity
H2S is not BCS
Explanation of the Meissner effect
Dynamic Hubbard model
Mean inner potential, diamagnetism and superconductivity
Kinetic energy driven charge expulsion...
Kinetic energy driven superfluidity...
Kinetic energy driven superconductivity...                               Physica C Special Issue on Superconducting Materials
Kinetic energy driven ferromagnetism...                                   Vol. 514 (2015) (Open access until May 31, 2016)
Double-valuedness of the electron wave function ...                  Introduction and overview
Spin-split states in aromatic molecules and superconductors
Electromotive forces and the Meissner effect puzzle
Spin Meissner effect, and electrodynamics of superconductors
Do superconductors violate Lenz's law?
What about BCS theory? Phys. Scr. 80 (2009) 035702
Meissner effect puzzle

Spin Hall Effect and spin current papers:
Phys.Rev.Lett.83, 1834 (1999), cond-mat/9906160 (1999),
Phys.Rev.B 60, 14787 (1999), cond-mat/9910408 (1999)
Spin currents in superconductors,
Phys. Rev. B 71, 184521 (2005)

### Brief description of research interests

We are interested in learning about the microscopic mechanisms that lead to the occurrence of collective effects in solids such as superconductivity and ferromagnetism. We believe that the essential physics of these phenomena is likely to be contained in simple models, even if the materials where these phenomena occur are very complicated. Once a plausible model is identified, we study it using various analytic and/or numerical techniques to learn about its properties and compare with experimental observations. For example we have recently introduced a new class of model Hamiltonians, 'dynamic Hubbard models' , to describe correlated electrons in solids. We have discovered that holes are not like electrons and that superconductivity in solids is intimately tied to the fundamental asymmetry between electrons and holes, because it originates in the undressing of antibonding electrons upon pairing , and are studying the consequences of this for optical, tunneling, and other experiments. We have recently found that the conventional BCS-London theory of superconductivity cannot explain the ubiquitous Meissner effect in superconductors. These findings imply that BCS theory is incorrect and that London theory is incorrect and that a superconductor is a giant atom. We have also proposed a new way to understand metallic ferromagnetism in solids, and that superconductivity and ferromagnetism have key physics in common. We are interested in kinetic energy driven superconductivity and superfluidity , and in the physics of spin currents in metals, superconductors, and molecules. We have proposed that the conventional 'Hall effect', the transverse voltage that is observed when a current circulates in an external magnetic field, should have as counterpart a 'spin Hall effect', involving the electron spin degrees of freedom. Similarly, we have proposed that the conventional Meissner effect, the spontaneous generation of a charge current near the surface of a superconductor in the presence of an external magnetic field, has as counterpart (so far undetected) a 'spin Meissner effect', the spontaneous generation of a spin current near the surface of a superconductor in the presence of an internal electric field.

## Recent and upcoming talks

### Selected Publications of J.E. Hirsch:

Hole Superconductivity and the High-Tc Oxides. With F. Marsiglio , Phys. Rev. B41, 6435 (1990).

Spin-Split States in Metals. Phys. Rev. B 41, 6820 (1990).

Weak Ferromagnetism in a Band Model: Application to Sc3In. Phys. Rev. B 44, 675 (1991).

Electron-hole asymmetry: the key to superconductivity , in "High-Temperature Superconductivity", ed. by J. Ashkenazi et al, Plenum Press, New York, 1991, p.295.

Apparent violation of the conductivity sum rule in certain superconductors, Physica C199, 305 (1992).

Superconductors that Change Color when they Become Superconducting. Physica C201, 347 (1992).

Superconductivity in the Transition Metal Series. With X.Q. Hong., Phys. Rev. B 46, 14702 (1992).

Color change and other unusual spectroscopic features predicted by the model of hole superconductivity , J. Phys. Chem. Solids 54, 1101 (1993).

Polaronic superconductivity in the absence of electron-hole symmetry. Phys. Rev. B47, 5351 (1993).

Thermoelectric Power of Superconductive Tunnel Junctions. Phys. Rev. Lett. 72, 558 (1994).

Electron-hole asymmetric polarons , in "Polarons and Bipolarons in high Tc Superconductors and Related Materials", ed. by E.K.H. Salje, A.S. Alexandrov and W.Y. Liang, Cambridge Unive rsity Press, Cambridge, 1995, p. 234.

Pairing in a tight binding model with occupation-dependent hopping rate: exact diagonalization study. With H.Q. Lin , Phys. Rev. B 52, 16155 (1995).

Metallic ferromagnetism in a single-band model: Effect of band filling and Coulomb interactions. With J.C. Amadon. Phys. Rev. B 54, 6364 (1996).

Possible contribution of direct exchange to the superfluidity of 3He. Phys. Rev. B 55, 8997 (1997).

Correlations between normal-state properties and superconductivity. Phys. Rev. B 55, 9007 (1997).

Metallic ferromagnetism in a band model: intra-atomic versus interatomic exchange Phys. Rev. B 56, 11022(1997).

Thermoelectric effect in superconductive tunnel junctions Phys. Rev. B 58, 8727 (1998)

Metallic ferromagnetism from kinetic-energy gain: The case of EuB6 Phys. Rev. B 59, 436 (1999)

Metallic ferromagnetism without exchange splitting Phys. Rev. B 59, 6256 (1999)

Slope of the superconducting gap function in $Bi_2Sr_2CaCu_2O_{8+\delta}$ measured by vacuum tunneling spectroscopy Phys. Rev. B 59 , 11962 (1999).

Spin Hall effect Phys. Rev. Lett. 83 , 1834 (1999).

Overlooked contribution to the Hall effect in ferromagnetic metals Phys.Rev.B 60, 14787 (1999)

Where is 99% of the condensation energy of Tl_2Ba_2CuO_y coming from? With F. Marsiglio , cond-mat/9908322, Physica C 331, 150 (2000).

Optical sum rule violation, superfluid weight and condensation energy in the cuprates With F. Marsiglio , cond-mat/0004496, Phys. Rev. B 62, 15131 (2000).

Anisotropic penetration depth and optical sum rule violation in La2-xSrxCuO4 With F. Marsiglio , cond-mat/0005002, presented at the 6th International Conference on Materials and Mechanisms of Superconductivity, Houston, February 2000, Physica C 341-348, 2217 (2000).

Hole superconductivity from kinetic energy gain ,cond-mat/0005033, presented at the 6th International Conference on Materials and Mechanisms of Superconductivity, Houston, February 2000, Physica C 341-348, 213 (2000).

Superconductivity and Ferromagnetism from Effective Mass Reduction , cond-mat/0007453, presented at the 6th International Conference on Materials and Mechanisms of Superconductivity, Houston, February 2000, Physica C 341-348, 211 (2000).

Superconductivity from Undressing , cond-mat/0007115, Phys.Rev.B 62, 14487 (2000)

Superconductivity from Undressing. II. Single Particle Green's Function and Photoemission in Cuprates , cond-mat/0007328, Phys.Rev.B 62, 14498 (2000)

Ferromagnetism from Undressing , cond-mat/0007454, Phys.Rev.B 62, 14131 (2000)

Consequences of charge imbalance in superconductors within the theory of hole superconductivity , cond-mat/0012517, Phys.Lett.A 281, 44 (2001)

Superconductivity from Hole Undressing , cond-mat/0102136, Physica C 364-365, 37 (2001). Presented at the Third International Conference on New Theories, Discoveries, and Applications of Superconductors and Related Materials (New3SC-3), Hawaii, January 2001.

Hole Superconductivity in $Mg B_2$: a high $T_c$ cuprate without Cu , cond-mat/0102115 , Phys. Lett. A282, p.392-398 (2001).

Electron-Phonon or Hole Superconductivity in $MgB_2$? , With F. Marsiglio , cond-mat/0102479 (2001), Phys.Rev. B 64, 144523 (2001).

Hole Superconductivity in MgB_2, Cuprates, and Other Materials , cond-mat/0106310 (2001) , , in "Studies of High Temperature Superconductors", ed. by A. Narlikar, Nova Sci. Pub., New York, Vol. 38, p. 49 (2002).

Dynamic Hubbard Model , Phys. Rev. Lett. 87, 206402 (2001).

Why holes are not like electrons: A microscopic analysis of the differences between holes and electrons in condensed matter , Phys.Rev. B 65, 184502 (2002), cond-mat/0109385 (2001).

Quantum Monte Carlo and exact diagonalization study of a dynamic Hubbard model , cond-mat/0201005 (2002), Phys.Rev. B65, 214510 (2002).

The True Colors of Cuprates , Science 295, 2226 (2002)

Quasiparticle undressing in a dynamic Hubbard model: exact diagonalization study , cond-mat/0205006 (2002), Phys.Rev. B66, 064507 (2002).

Electronic dynamic Hubbard model: exact diagonalization study , cond-mat/0207369 (2002), Phys.Rev. B67, 035103 (2003).

Quasiparticle undressing: a new route to collective effects in solids , cond-mat/0211642 (2002), in "Concepts in Electron Correlation", ed. by A.C. Hewson and V. Zlatic, Kluwer Academic Publishers, Dordrecht, 2003, p. 371.

Electron-hole asymmetry and superconductivity , cond-mat/0211643, Phys.Rev.B 68, 012510 (2003).

Electron-hole asymmetry is the key to superconductivity , cond-mat/0301610, New3SC-4 meeting, San Diego, Jan. 16-21 2003, Int. J. Mod. Phys. B 17, 3236 (2003).

Superconductors as giant atoms predicted by the theory of hole superconductivity , cond-mat/0301611 , Phys.Lett.A 309, 457 (2003).

Spontaneous spinning of a magnet levitating over a superconductor , with D.J. Hirsch, cond-mat/0303574 (2003), Physica C398, 8 (2003).

The Lorentz force and superconductivity , cond-mat/0305542, Phys.Lett.A 315, 474 (2003).

Superconductors as giant atoms: qualitative aspects , cond-mat/0305574 (2003), AIP Conf. Proc. 695(1) 21 (17 Dec 2003).

Charge expulsion and electric field in superconductors , cond-mat/0308604, Phys.Rev. B 68, 184502 (2003).

Dynamic Hubbard Model: Effect of Finite Boson Frequency , F. Marsiglio, R. Teshima, JEH, cond-mat/0307594 (2003), Phys.Rev. B 68, 224507 (2003).

Predicted electric field near small superconducting ellipsoids , cond-mat/0312618 (2003), Phys.Rev.Lett. 92, 016402 (2004).

Electrodynamics of superconductors , cond-mat/0312619 (2003), Phys.Rev. B 69, 214515 (2004).

Spin currents in superconductors , cond-mat/0406489 (2004), Phys.Rev. B 71, 184521 (2005).

The fundamental role of charge asymmetry in superconductivity , cond-mat/0407642 (Los Alamos), J. Phys. Chem. Solids 67, p.21 (2006), SNS'2004, Sitges,Spain, July 11-16,2004.

Reply to Comment on `Charge expulsion and electric field in superconductors' '', by T. Koyama , cond-mat/0412091 (2004), Phys.Rev. B 70, 226504 (2004).

Why holes are not like electrons. II. The role of the electron-ion interaction. , Phys.Rev.B 71, 104522 (2005), cond-mat/0504013 (2005).

Explanation of the Tao effect , cond-mat/0502626 (2005) , Phys.Rev.Lett. 94, 187001 (2005).

An index to quantify an individual's scientific output , physics/0508025 (2005), Proc Natl Acad Sci USA 102, 16569 (2005).

Spin currents, relativistic effects and the Darwin interaction in the theory of hole superconductivity , cond-mat/0508471 (2005), Phys.Lett. A 345, 453 (2005)

Pair production in superconductors , cond-mat/0508529 (2005)

The fundamental role of charge asymmetry in superconductivity, Jour. Phys. Chem. Solids 67, 21 (2006).

Do superconductors violate Lenz's law? Body rotation under field cooling and theoretical implications, Phys.Lett. A366, 615 (2007).

Does the h-index have predictive power? , arXiv:0708.0646 (2007), Proc Natl Acad Sci USA 104, 19193 (2007).

Spin Meissner Effect in Superconductors and the Origin of the Meissner Effect , arXiv:0710.0876 (2007), Europhys. Lett. 81, 67003 (2008).

Electrodynamics of spin currents in superconductors , arXiv:0803.1198 (2008), Ann. Phys. (Berlin) 17, 380 (2008).

The missing angular momentum of superconductors , arXiv:0803.2054, (2008), J. Phys. Cond. Matt. 20, 235233 (2008).

Hole superconductivity in Arsenic-Iron compounds . With F. Marsiglio , arXiv:0804.0002, (2008), doi:10.1016/j.physc.2008.05.051, Physica C 468, 1047 (2008).

Explanation of the Meissner Effect and Prediction of a Spin Meissner Effect in Low and High $T_c$ Superconductors, Physica C 470, S955 (2010).

Why non-superconducting metallic elements become superconducting under high pressure. With J.J. Hamlin, Physica C 470, S937 (2010).

Electromotive forces and the Meissner effect puzzle, Journal of Superconductivity and Novel Magnetism 23, 309 (2010) dx.doi.org/10.1007/s10948-009-0531-4.

A new basis set for the description of electrons in superconductors , Physics Letters A 373, 1880 (2009) dx.doi.org/doi:10.1016/j.physleta.2009.03.058.

Why holes are not like electrons. IV. Hole undressing and spin current in the superconducting state , Int. Jour. Mod. Phys. B 24, 3627 (2010), arXiv 1002.2688.

Hole core in superconductors and the origin of the Spin Meissner effect, Physica C 470, 635 (2010) dx.doi.org/10.1016/j.physc.2010.06.005.

Kinetic energy driven superconductivity, the origin of the Meissner effect, and the reductionist frontier, arXiv:1103.3912 (2011), Int. J. Mod. Phys. B 25, 1173 (2011).

Did Herbert Fröhlich predict or postdict the isotope effect in superconductors? , arXiv:1108.3835 (2011), Physica Scripta 84, 045705 (2011).

Kinetic energy driven superconductivity and superfluidity , arXiv:1109.0504 (2011), Mod. Phys. Lett. B 25, 2219 (2011).

The origin of the Meissner effect in new and old superconductors , arXiv:1201.0139 (2011), Physica Scripta 85, 035704 (2012).

Kinetic energy driven superfluidity and superconductivity and the origin of the Meissner effect, arXiv:1210.1578 (2012), Physica C 493, 18 (2013).

Dynamic Hubbard model: kinetic energy driven charge expulsion, charge inhomogeneity, hole superconductivity, and Meissner effect, arXiv:1302.4178 (2013), Physica Scripta 88, 035704 (2013).

Dynamic Hubbard model for solids with hydrogen-like atoms, arXiv:1406.7332 (2014), Phys. Rev. B 90, 104501 (2014).