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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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86 papers · 1 filter
A Landau Theory for Pair Density Modulation in Fe(Te,Se) flakes
Po-Jui Chen, Piers Coleman
Motivated by recent scanning tunneling microscopy (STM) experiments reporting a pair-density modulation (PDM) in flakes of FeTeSe, we develop a Landau theory…
Dual view of the Z-Gauged XY Model in 3D
Piers Coleman, Anatoly Kuklov, Alexei Tsvelik
The gauged neutral XY model is of long-standing interest both in the context of nematic order, and the study of fractionalization and superconductivity. This paper presents h…
Feasibility of the Josephson voltage and current standards on a single chip
Rais S. Shaikhaidarov, Ilya Antonov, Kyung Ho Kim +4
The quantum Josephson voltage standard is well established across the metrology community for many years. It relies on the synchronisation of the flux tunneling in the S/I/S Joseps…
Chiral superfluid helium-3 in the quasi-two-dimensional limit
Petri J. Heikkinen, Lev V. Levitin, Xavier Rojas +8
Anisotropic pair breaking close to surfaces favors the chiral A phase of the superfluid He over the time-reversal invariant B phase. Confining the superfluid He into a cavi…
A-B transition in superfluid He and cosmological phase transitions
Mark Hindmarsh, J. A. Sauls, Kuang Zhang +10
First order phase transitions in the very early universe are a prediction of many extensions of the Standard Model of particle physics and could provide the departure from equilibr…
Nanofluidic platform for studying the first-order phase transitions in superfluid helium-3
Petri J. Heikkinen, Nathan Eng, Lev V. Levitin +9
The symmetry-breaking first-order phase transition between superfluid phases He-A and He-B can be triggered extrinsically by ionising radiation or heterogeneous nucleation…
Triplet pairing, orbital selectivity and correlations in Iron-based superconductors
Yashar Komijani, Elio Koenig, Piers Coleman
We use a slave-boson approach to study the band renormalization and pair susceptibility in the normal state of Iron-based superconductors in presence of strong Coulomb repulsion an…
Disorder Induced Anomalous Thermal Hall Effect in Chiral Phases of Superfluid He
Priya Sharma, Anton B. Vorontsov, J. A. Sauls
NMR experiments on liquid He infused into uniaxially anisotropic silica aerogels show the stabilisation of two equal-spin-pairing chiral phases on cooling from the normal phase…
Quantized current steps due to the a.c. coherent quantum phase-slip effect
R. S. Shaikhaidarov, K. H. Kim, J. W. Dunstan +7
The AC Josephson effect predicted in 1962 and observed experimentally in 1963 as quantised voltage steps (the Shapiro steps) from photon assisted tunnelling of Cooper pairs is amon…
Triplet pairing mechanisms from Hund's-Kondo models: applications to UTe and CeRhAs
Tamaghna Hazra, Piers Coleman
Observing that several U and Ce based candidate triplet superconductors share a common structural motif, with pairs of magnetic atoms separated by an inversion center, we hypothesi…
Spin fluctuations associated with the collapse of the pseudogap in a cuprate superconductor
M. Zhu, D. J. Voneshen, S. Raymond +3
Theories of the origin of superconductivity in cuprates are dependent on an understanding of their normal state which exhibits various competing orders. Transport and thermodynamic…
Anomalous Thermal Hall Effect in Chiral Phases of He-Aerogel
Priya Sharma, J. A. Sauls
We report theoretical results for heat transport by quasiparticle excitations in superfluid He infused into silica aerogel engineered with uniaxial anisotropy. For this system…
Superconductivity from energy fluctuations in dilute quantum critical polar metals
Pavel A. Volkov, Premala Chandra, Piers Coleman
Superconductivity in low carrier density metals challenges the conventional electron-phonon theory due to the absence of retardation required to overcome Coulomb repulsion. In quan…
Formation of tungsten carbide by focused ion beam process: A route to high magnetic field resilient patterned superconducting nanostructures
Himadri Chakraborti, Bhanu P Joshi, Chanchal K. Barman +10
A scale for magnetic field resilience of a superconductor is set by the paramagnetic limit. Comparing the condensation energy of the Bardeen-Cooper-Schrieffer (BCS) singlet ground…
Path-Dependent Supercooling of the He Superfluid A-B transition
Dmytro Lotnyk, Anna Eyal, Nikolay Zhelev +7
We examine the discontinuous first-order superfluid He A to B transition in the vicinity of the polycritical point (2.232 mK and 21.22 bar). We find path-dependent transitions:…
Two-level systems in superconducting quantum devices due to trapped quasiparticles
S. E. de Graaf, L. Faoro, L. B. Ioffe +6
A major issue for the implementation of large scale superconducting quantum circuits is the interaction with interfacial two-level system defects (TLS) that leads to qubit relaxati…
Capturing Complex Behaviour in Josephson Travelling Wave Parametric Amplifiers
Tom Dixon, Jacob W. Dunstan, George B. Long +3
We present an analysis of wave-mixing in recently developed Josephson Travelling Wave Parametric Amplifiers (JTWPAs). Circuit simulations performed using WRspice show the full beha…
Fragility of surface states in topological superfluid He
P. J. Heikkinen, A. Casey, L. V. Levitin +6
Topological superfluid He, with unconventional spin-triplet p-wave pairing, provides a model system for topological superconductors, which have attracted significant interest t…
selective scattering within Quasiparticle Interference measurements of FeSe
Luke C. Rhodes, Matthew D. Watson, Timur K. Kim +1
Quasiparticle interference (QPI) provides a wealth of information relating to the electronic structure of a material. However, it is often assumed that this information is constrai…
Tuning of Magnetic Activity in Spin-Filter Josephson Junctions Towards Spin-Triplet Transport
R. Caruso, D. Massarotti, G. Campagnano +6
The study of superconductor-ferromagnet interfaces has generated great interest in the last decades, leading to the observation of spin-aligned triplet supercurrents and 0-pi trans…
Crystalline symmetry protected helical Majorana modes in the iron pnictides
Elio J. König, Piers Coleman
We propose that propagating one-dimensional Majorana fermions will develop in the vortex cores of certain iron-based superconductors, most notably Li(FeCo)As. A key ing…
Generation of pure superconducting spin current in magnetic heterostructures via non-locally induced magnetism due to Landau Fermi-liquid effects
X. Montiel, M. Eschrig
We propose a mechanism for the generation of pure superconducting spin-current carried by equal-spin triplet Cooper pairs in a superconductor (S) sandwiched between a ferromagnet (…
Scaling of the superconducting gap with orbital character in FeSe
Luke C. Rhodes, Matthew D. Watson, Amir A. Haghighirad +3
We use high-resolution angle-resolved photoemission spectroscopy to map the three-dimensional momentum dependence of the superconducting gap in FeSe. We find that on both the hole…
Superconducting Sweet-Spot in Microcrystalline Graphite Revealed by Point-Contact Spectroscopy
Frank Arnold, Jan Nyeki, John Saunders
In this letter we describe the observation of a magnetic field dependent electronic gap, suggestive of local superconductivity, in the point-contact spectrum of micro-crystalline g…