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News Article | February 21, 2017
Site: www.pressat.co.uk

Tuesday 21 February, 2017 The management and members of the Professional mediators Association (PMA) are thrilled to welcome over 30 tax dispute mediators from HM Revenue & Customs (HMRC) as accredited members of the PMA. The PMA is committed to delivering excellence across all areas of mediation and Alternative Dispute Resolution (ADR). We are delighted that HMRC have chosen the PMA as the standard bearer for best practice in tax dispute mediation.Each of the HMRC tax dispute mediators has undertaken a rigorous accredited training programme designed and delivered by The PMA’s training partners at The TCM Group. The route to accreditation for HMRC mediators included completing an assessed role play and the completion of a detailed learning journal.David Liddle, president of the Professional Mediators Association added: “We are delighted that HMRC have chosen the PMA as their mediator certification body and we look forward to working with HMRC and other Government Departments to ensure that they uphold the highest of professional standards going forward.”About the PMAThe Professional Mediators' Association is an independent, not for profit company formed in 2007 to act as a professional body for a community of mediators working across the UK and globally. The PMA exists to raise awareness of mediation and to promote excellence in all aspects of business, workplace, employment and consumer mediation. Our aim is to provide a voice for professional mediators and to influence government policy and decision making whilst raising the profile and standards of mediation practice. For more details and to join the PMA, please visit www.professionalmediator.org.##Ends## Notes to editorsFor more details please contact David Liddle at the Professional Mediators' Association (david.liddle@professionalmediator.org)The Professional Mediators' Association exists to promote excellence in all aspects of business, workplace, employment and consumer mediation.Visit www.professionalmediator.org for more information and to download a membership pack.For press and media enquiries, or to arrange an interview, please contact David Liddle on 020 7404 3186 or e-mail: david.liddle@professionalmediator.org. http://www.professionalmediator.org/ * For more information regarding media usage, ownership and rights please contact The Professional Medaitors' Association. Distributed by http://www.pressat.co.uk/


News Article | February 22, 2017
Site: www.pressat.co.uk

The management and members of the Professional Mediators Association (PMA) are thrilled to welcome over 30 tax dispute mediators from HM Revenue & Customs (HMRC) as accredited members of the PMA. The PMA is committed to delivering excellence across all areas of mediation and Alternative Dispute Resolution (ADR). We are delighted that HMRC have chosen the PMA as the standard bearer for best practice in tax dispute mediation. Each of the HMRC tax dispute mediators has undertaken a rigorous accredited training programme designed and delivered by The PMA’s training partners at The TCM Group. The route to accreditation for HMRC mediators included completing an assessed role play and the completion of a detailed learning journal. David Liddle, president of the Professional Mediators Association added: “We are delighted that HMRC have chosen the PMA as their mediator certification body and we look forward to working with HMRC and other Government Departments to ensure that they uphold the highest of professional standards going forward.” The Professional Mediators' Association is an independent, not for profit company formed in 2007 to act as a professional body for a community of mediators working across the UK and globally. The PMA exists to raise awareness of mediation and to promote excellence in all aspects of mediation. Our aim is to provide a voice for professional mediators and to influence government policy and decision making whilst raising the profile and standards of mediation practice. For more details and to join the PMA, please visit www.professionalmediator.org. For more details please contact the Professional Mediators' Association ([email protected])


Cooper N.R.,Tcm Group | Dalibard J.,Kastler-Brossel Laboratory | Dalibard J.,Collège de France
Physical Review Letters | Year: 2013

We present a robust scheme by which fractional quantum Hall states of bosons can be achieved for ultracold atomic gases. We describe a new form of optical flux lattice, suitable for commonly used atomic species with ground state angular momentum Jg=1, for which the lowest energy band is topological and nearly dispersionless. Through exact diagonalization studies, we show that, even for moderate interactions, the many-body ground states consist of bosonic fractional quantum Hall states, including the Laughlin state and the Moore-Read (Pfaffian) state. These phases are shown to have energy gaps that are larger than temperature scales achievable in ultracold gases. © 2013 American Physical Society.


Price H.M.,TCM Group | Cooper N.R.,TCM Group
Physical Review Letters | Year: 2013

Topological energy bands have important geometrical properties described by the Berry curvature. We show that the Berry curvature changes the hydrodynamic equations of motion for a trapped Bose-Einstein condensate, and causes significant modifications to the collective mode frequencies. We illustrate our results for the case of two-dimensional Rashba spin-orbit coupling in a Zeeman field. Using an operator approach, we derive the effects of Berry curvature on the dipole mode in very general settings. We show that the sizes of these effects can be large and readily detected in experiment. Collective modes therefore provide a sensitive way to measure geometrical properties of energy bands. © 2013 American Physical Society.


Beri B.,Tcm Group | Cooper N.R.,Tcm Group
Physical Review Letters | Year: 2011

We describe how optical dressing can be used to generate band structures for ultracold atoms with nontrivial Z2 topological order. Time-reversal symmetry is preserved by simple conditions on the optical fields. We first show how to construct optical lattices that give rise to Z2 topological insulators in two dimensions. We then describe a general method for the construction of three-dimensional Z2 topological insulators. A central feature of our approach is a new way to understand Z2 topological insulators starting from the nearly free electron limit. © 2011 American Physical Society.


Knolle J.,Tcm Group | Cooper N.R.,Tcm Group
Physical Review Letters | Year: 2015

The de Haas-van Alphen effect (dHvAE), describing oscillations of the magnetization as a function of magnetic field, is commonly assumed to be a definite sign for the presence of a Fermi surface (FS). Indeed, the effect forms the basis of a well-established experimental procedure for accurately measuring FS topology and geometry of metallic systems, with parameters commonly extracted by fitting to the Lifshitz-Kosevich (LK) theory based on Fermi liquid theory. Here we show that, in contrast to this canonical situation, there can be quantum oscillations even for band insulators of certain types. We provide simple analytic formulas describing the temperature dependence of the quantum oscillations in this setting, showing strong deviations from LK theory. We draw connections to recent experiments and discuss how our results can be used in future experiments to accurately determine, e.g., hybridization gaps in heavy-fermion systems. © 2015 American Physical Society.


Scaffidi T.,Ecole Normale Superieure de Paris | Scaffidi T.,University of Oxford | Moller G.,TCM Group
Physical Review Letters | Year: 2012

We show how the phases of interacting particles in topological flat bands, known as fractional Chern insulators, can be adiabatically connected to incompressible fractional quantum Hall liquids in the lowest Landau level of an externally applied magnetic field. Unlike previous evidence suggesting the similarity of these systems, our approach enables a formal proof of the equality of their topological orders, and furthermore this proof robustly extends to the thermodynamic limit. We achieve this result using the hybrid Wannier orbital basis proposed by Qi in order to construct interpolation Hamiltonians that provide continuous deformations between the two models. We illustrate the validity of our approach for the ground state of bosons in the half filled Chern band of the Haldane model, showing that it is adiabatically connected to the ν=1/2 Laughlin state of bosons in the continuum fractional quantum Hall problem. © 2012 American Physical Society.


Price H.M.,TCM Group | Cooper N.R.,TCM Group
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2012

We propose a general method by which experiments on ultracold gases can be used to determine the topological properties of the energy bands of optical lattices, as represented by the map of the Berry curvature across the Brillouin zone. The Berry curvature modifies the semiclassical dynamics and hence the trajectory of a wave packet undergoing Bloch oscillations. However, in two dimensions these trajectories may be complicated Lissajous-like figures, making it difficult to extract the effects of Berry curvature in general. We propose how this can be done using a "time-reversal" protocol. This compares the velocity of a wave packet under positive and negative external force, and allows a clean measurement of the Berry curvature over the Brillouin zone. We discuss how this protocol may be implemented and explore the semiclassical dynamics for three specific systems: the asymmetric hexagonal lattice and two "optical flux" lattices in which the Chern number is nonzero. Finally, we discuss general experimental considerations for observing Berry curvature effects in ultracold gases. © 2012 American Physical Society.


Moller G.,TCM Group | Cooper N.R.,TCM Group
Physical Review Letters | Year: 2012

We study correlated phases occurring in the flat lowest band of the dice-lattice model at flux density one-half. We discuss how to realize this model, also referred to as the T 3 lattice, in cold atomic gases. We construct the projection of the model to the lowest dice band, which yields a Hubbard Hamiltonian with interaction-assisted hopping processes. We solve this model for bosons in two limits. In the limit of large density, we use Gross-Pitaevskii mean-field theory to reveal time-reversal symmetry breaking vortex lattice phases. At low density, we use exact diagonalization to identify three stable phases at fractional filling factors ν of the lowest band, including a classical crystal at ν=1/3, a supersolid state at ν=1/2, and a Mott insulator at ν=1. © 2012 American Physical Society.


Bilitewski T.,Tcm Group | Cooper N.R.,Tcm Group
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2015

Motivated by recent experimental implementations of artificial gauge fields for gases of cold atoms, we study the scattering properties of particles that are subjected to time-periodic Hamiltonians. Making use of Floquet theory, we focus on translationally invariant situations in which the single-particle dynamics can be described in terms of spatially extended Floquet-Bloch waves. We develop a general formalism for the scattering of these Floquet-Bloch waves. An important role is played by the conservation of Floquet quasienergy, which is defined only up to the addition of integer multiples of ω for a Hamiltonian with period T=2π/ω. We discuss the consequences of this for the interpretation of "elastic" and "inelastic" scattering in cases of physical interest. We illustrate our general results with applications to the scattering of a single particle in a Floquet-Bloch state from a static potential and the scattering of two bosonic particles in Floquet-Bloch states through their interparticle interaction. We analyze examples of these scattering processes that are closely related to the schemes used to generate artificial gauge fields in cold-atom experiments, through optical dressing of internal states, or through time-periodic modulations of tight-binding lattices. We show that the effects of scattering cannot, in general, be understood by an effective time-independent Hamiltonian, even in the limit ω→ of rapid modulation. We discuss the relative sizes of the elastic scattering (required to stabilize many-body phases) and of the inelastic scattering (leading to deleterious heating effects). In particular, we describe how inelastic processes that can cause significant heating in the current experimental setup can be switched off by additional confinement of transverse motion. © 2015 American Physical Society.

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