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Cavendish Laboratory Snapshot • 100 – 120 MSci (4-year) undergraduates annually • 60 – 70 PhD’s annually • ~ 150 postdocs and research staff • 65 teaching faculty (+ 8 to be appointed in next 2 years) • £14M annual research grant expenditure • Institute of Astronomy – ~20 faculty, 50 graduate students, 50 postdocs The Cavendish Laboratory – Research organisation • High Energy Physics • Astrophysics • Biological and Soft Systems • Semiconductor Physics • Optoelectronics and Microelectronics • Quantum Matter • Materials Physics • Theory of Condensed Matter • Quantum optics and atomic physics Major Initiatives • Nanoscience Centre (2003) £20 M interdisciplinary centre involving Engineering, Physics, Materials, Biological Physics. • Physics of medicine Have secured £12.5M funding for phased construction of new research laboratories for completion in 2008 2 new lecturers hired New Herchel Smith professor … Major Initiatives • Kavli Institute for Cosmology New institute drawing on Cavendish, Institute of Astronomy, and Dept Applied Maths and Theoretical Physics • Quantum Optics New experimental programmes in ultracold atomic physics, and in semiconductor quantum optics (2 lecturers, reader) Challenges in Quantum Matter • Collective quantum behaviour gives rise to many unusual (and useful) phenomena: magnetism, superconductivity, superfluidity, optical coherence and lasing, quantum Hall effects, • Study models and potentially applicable systems systems made by both chemistry (e.g. cuprates, manganites, heavy fermions) and physics (e.g. quantum wells, optical lattices) extreme conditions useful (B,T,P) • Convergence of research in materials science, condensed matter physics, atomic physics, and quantum optics • Goals: – materials for new technologies (e.g. multiferroics) – “coherent control” of macroscopic quantum phenomena Cavendish research in quantum matter • Quantum Matter group – low temperature physics, superconductivity, magnetism, strongly correlated electronic systems • Theory of Condensed Matter group – numerical electronic structure methods, many body physics, quantum transport, overlap with research activities in Semiconductor Physics, Optoelectronics, and Quantum Optics. A solid state Bose-Einstein condensate Momentum distribution of cold atoms Momentum distribution of cold exciton-polaritons Rb atom condensate, JILA, Colorado Nature, Sept 28 2006, Unconventional superconductivity • “high-Tc” cuprates, heavy fermion compounds, intercalated graphite • exciton and exciton-polariton Bose-Einstein condensation • coherent magnetic state in BaCuSiO • ultracold atomic superfluids 6Li, 40K, with tunable interactions • bilayer quantum Hall effect Electronic “soft” matter Defects in nematic liquid crystal “Pure” phases of matter can have complex structure “Stripes” of charge-density wave in TaSe2 100 nm C.H.Chen 30 nm patches of charge-order in LaCaMnO3 Loudon & Midgley Competing phases • How do phase transitions happen at T=0 ? – quantum critical phenomena • Often competition between two phases generates new thermodynamic mixed phases – “Colossal” magneto-resistance in manganites is a result of competition between metallic ferromagnetism and insulating charge order – Spontaneous development of inhomogeneous magnetism and metallicity CKC Look for collaborative opportunities where there are common interests and complementary skills / techniques Focus on novel electronic materials with special functionality, studied at low T, possibly high B, P