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Superconductivity in graphite intercalation compounds

Physica C: Superconductivity and its Applications Elsevier 514 (2015) 50-58

Authors:

Robert P Smith, Thomas E Weller, Christopher A Howard, Mark PM Dean, Kaveh C Rahnejat, Siddharth S Saxena, Mark Ellerby

Connecting Berezinskii-Kosterlitz-Thouless and BEC Phase Transitions by Tuning Interactions in a Trapped Gas

Physical Review Letters American Physical Society (APS) 114:25 (2015) 255302

Authors:

Richard J Fletcher, Martin Robert-de-Saint-Vincent, Jay Man, Nir Navon, Robert P Smith, Konrad GH Viebahn, Zoran Hadzibabic

Superconductivity in graphite intercalation compounds

(2015)

Authors:

Robert P Smith, Thomas E Weller, Christopher A Howard, Mark PM Dean, Kaveh C Rahnejat, Siddharth S Saxena, Mark Ellerby

Connecting Berezinskii-Kosterlitz-Thouless and BEC phase transitions by tuning interactions in a trapped gas

(2015)

Authors:

Richard J Fletcher, Martin Robert-de-Saint-Vincent, Jay Man, Nir Navon, Robert P Smith, Konrad GH Viebahn, Zoran Hadzibabic

Quantum gases. Critical dynamics of spontaneous symmetry breaking in a homogeneous Bose gas.

Science (New York, N.Y.) 347:6218 (2015) 167-170

Authors:

Nir Navon, Alexander L Gaunt, Robert P Smith, Zoran Hadzibabic

Abstract:

Kibble-Zurek theory models the dynamics of spontaneous symmetry breaking, which plays an important role in a wide variety of physical contexts, ranging from cosmology to superconductors. We explored these dynamics in a homogeneous system by thermally quenching an atomic gas with short-range interactions through the Bose-Einstein phase transition. Using homodyne matter-wave interferometry to measure first-order correlation functions, we verified the central quantitative prediction of the Kibble-Zurek theory, namely the homogeneous-system power-law scaling of the coherence length with the quench rate. Moreover, we directly confirmed its underlying hypothesis, the freezing of the correlation length near the transition. Our measurements agree with a beyond-mean-field theory and support the expectation that the dynamical critical exponent for this universality class is z = 3/2.