Bibliography
- Buhrman,R. A.,&Halperin,W. P. (1973). Fluctuation Diamagnetism in a" Zero-Dimensional" Superconductor. Physical Review Letters,30(15),692.
- Halperin,W. P.,Archie,C. N.,Rasmussen,F. B.,Buhrman,R. A.,&Richardson,R. C. (1974). Observation of Nuclear Magnetic Order in Solid He3. Physical Review Letters,32(17),927.
- Halperin,W. P. (1986). Quantum size effects in metal particles. Reviews of Modern Physics,58,533.
- D’Orazio,F.,Bhattacharja,S.,Halperin,W. P.,Eguchi,K.,&Mizusaki,T. (1990). Molecular diffusion and nuclear-magnetic-resonance relaxation of water in unsaturated porous silica glass. Physical Review B,42,9810.
- Halperin,W. P.,Jehng,J. Y.,&Song,Y. Q. (1994). Application of spin-spin relaxation to measurement of surface area and pore size distributions in a hydrating cement paste. Magnetic resonance imaging,12,169–173.
- Sprague,D. T.,Haard,T. M.,Kycia,J. B.,Rand,M. R.,Lee,Y.,Hamot,P. J.,&Halperin,W. P. (1995). Homogeneous equal-spin pairing superfluid state of 3He in aerogel. Physical Review Letters,75,661.
- Lee,Y.,Haard,T. M.,Halperin,W. P.,&Sauls,J. A. (1999). Discovery of the acoustic Faraday effect in superfluid 3He-B. Nature,400(6743),431–433.
- Mitrović,V. F.,Sigmund,E. E.,Eschrig,M.,Bachman,H. N.,Halperin,W. P.,Reyes,A. P.,Kuhns,P.,&Moulton,W. G. (2001). Spatially resolved electronic structure inside and outside the vortex cores of a high-temperature superconductor. Nature,413,501–504.
- Choi,H.,Davis,J. P.,Pollanen,J.,&Halperin,W. P. (2006). Surface Specific Heat of He 3 and Andreev Bound States. Physical Review Letters,96(12),125301.
- Pollanen,J.,Li,J. I. A.,Collett,C. A.,Gannon,W. J.,Halperin,W. P.,&Sauls,J. A. (2012). New chiral phases of superfluid 3He stabilized by anisotropic silica aerogel. Nature Physics,8(4),317–320.
- Schemm,E. R.,Gannon,W. J.,Wishne,C. M.,Halperin,W. P.,&Kapitulnik,A. (2014). Observation of broken time-reversal symmetry in the heavy-fermion superconductor UPt3. Science,345(6193),190–193.
- Nguyen,M. D.,Zimmerman,A. M.,&Halperin,W. P. (2019). Corrections to Higgs mode masses in superfluid He3 from acoustic spectroscopy. Physical Review B,99(5),054510.
- Halperin,W. P. (2019). Superfluid 3He in aerogel. Annual Review of Condensed Matter Physics,10,155–170.
- Avers,K. E.,Gannon,W. J.,Kuhn,S. J.,Halperin,W. P.,Sauls,J. A.,DeBeer-Schmitt,L.,... &Eskildsen,M. R. (2020). Broken time-reversal symmetry in the topological superconductor UPt3. Nature Physics,16(5),531–535.
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References
- 1 2 3 4 "William Halperin".
- ↑ Mitrović, V. F.; Sigmund, E. E.; Halperin, W. P.; Reyes, A. P.; Kuhns, P.; Moulton, W. G. (2003). "Antiferromagnetism in the Vortex Cores of YBa2Cu3O7−δ". Physical Review B. 67 (22): 220503. doi:10.1103/PhysRevB.67.220503. S2CID 119094814.
- ↑ "Summer 2017 Newsletter".
- ↑ "Progress in Low Temperature Physics, Volume 15".
- ↑ "CHAPTER 7 - Order-Parameter Collective Modes in Superfluid 3He".
- ↑ Halperin, W. P. (1986). "Quantum size effects in metal particles". Reviews of Modern Physics. 58 (3): 533–606. doi:10.1103/RevModPhys.58.533.
- 1 2 Halperin, W. P.; Buhrman, R. A.; Webb, W. W.; Richardson, R. C. (1974). Properties of 3He on the Melting Curve. pp. 139–143. doi:10.1007/978-1-4613-4520-6_22. ISBN 978-1-4613-4522-0.
- 1 2 Halperin, W. P.; Archie, C. N.; Rasmussen, F. B.; Buhrman, R. A.; Richardson, R. C. (1974). "Observation of Nuclear Magnetic Order in Solid 3He". Physical Review Letters. 32 (17): 927–930. doi:10.1103/PhysRevLett.32.927.
- ↑ Halperin, W. P.; Archie, C. N.; Rasmussen, F. B.; Richardson, R. C. (1975). "Thermodynamic Temperature Scale Derived from Measurements of 3He Latent Heat". Physical Review Letters. 34 (12): 718–721. doi:10.1103/PhysRevLett.34.718.
- ↑ Osheroff, D. D.; Richardson, R. C.; Lee, D. M. (1972). "Evidence for a New Phase of Solid He3". Physical Review Letters. 28 (14): 885–888. doi: 10.1103/PhysRevLett.28.885 .
- ↑ Leggett, A. J. (1973). "Microscopic Theory of NMR in an Anisotropic Superfluid (3HeA)". Physical Review Letters. 31 (6): 352–355. doi:10.1103/PhysRevLett.31.352.
- ↑ Bardeen, J.; Cooper, L. N.; Schrieffer, J. R. (1957). "Theory of Superconductivity". Physical Review. 108 (5): 1175–1204. doi: 10.1103/PhysRev.108.1175 . S2CID 73661301.
- ↑ "Discovery of the acoustic Faraday effect in superfluid 3He-B".
- ↑ "Faraday effect".
- ↑ Moores, G. F.; Sauls, J. A. (1993). "Transverse waves in superfluid 3He-B". Journal of Low Temperature Physics. 91 (1–2): 13–37. doi:10.1007/BF00132087. S2CID 121853121.
- ↑ "Journal of Experimental and Theoretical Physics".
- ↑ "Broken Time-Reversal Symmetry in the Topological Superconductor UPt3".
- ↑ Strand, J. D.; Van Harlingen, D. J.; Kycia, J. B.; Halperin, W. P. (2009). "Evidence for Complex Superconducting Order Parameter Symmetry in the Low-Temperature Phase of UPt3 from Josephson Interferometry". Physical Review Letters. 103 (19): 197002. doi:10.1103/PhysRevLett.103.197002. PMID 20365946.
- ↑ Porto, J. V.; Parpia, J. M. (1995). "Superfluid 3He in Aerogel". Physical Review Letters. 74 (23): 4667–4670. doi:10.1103/PhysRevLett.74.4667. PMID 10058568.
- ↑ Sprague, D. T.; Haard, T. M.; Kycia, J. B.; Rand, M. R.; Lee, Y.; Hamot, P. J.; Halperin, W. P. (1995). "Homogeneous equal-spin pairing superfluid state of 3He in aerogel". Physical Review Letters. 75 (4): 661–664. doi:10.1103/PhysRevLett.75.661. PMID 10060082.
- ↑ Thuneberg, E. V.; Yip, S. K.; Fogelström, M.; Sauls, J. A. (1998). "Models for Superfluid 3He in Aerogel". Physical Review Letters. 80 (13): 2861–2864. arXiv: cond-mat/9601148 . doi:10.1103/PhysRevLett.80.2861. S2CID 119413987.
- ↑ Halperin, W.P. (2019). "Superfluid 3He in Aerogel". Annual Review of Condensed Matter Physics. 10: 155–170. arXiv: 1806.06437 . doi:10.1146/annurev-conmatphys-031218-013134. S2CID 119337588.
- ↑ "Past Fellows".
- ↑ "APS Fellow Archive".
- ↑ "Fritz London Memorial Prize".
