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SUMMARY:Three-dimensional uniform electron gas by Quantum Monte Carlo - Sa
 m Azadi\, Imperial College London
DTSTART:20220210T140000Z
DTEND:20220210T150000Z
UID:TALK169442@talks.cam.ac.uk
CONTACT:Edgar Engel
DESCRIPTION:Electronic systems are at the centre of many of the most impor
 tant and topical areas of applied science\,  including materials physics\,
  chemistry\, nano-electronics\, and quantum computation. The electron liqu
 id paradigm is the foundation of many of our current understanding of thes
 e systems' physical and chemical properties.\nAccording to Landau’s Ferm
 i liquid theory\, the main properties of the quasiparticle excitations of 
 an electron liquid are embodied in the effective mass\, which determines t
 he energy of a single quasiparticle\, and the Landau interaction function\
 , which indicates how the energy of a quasiparticle is modified by the pre
 sence of other quasiparticles. This simple paradigm underlies our current 
 understanding of the physical and chemical behaviour of metallic systems. 
 The quasiparticle effective mass of the three dimensional homogeneous elec
 tron gas has been the subject of theoretical controversy\, and there is a 
 lack of experimental data.\nIn this talk\, I will present the development 
 of a technique using a stochastic approach to calculate the quasiparticle 
 effective mass of paramagnetic and ferromagnetic electron liquid. The resu
 lts obtained by the many-body wave function based diffusion quantum Monte 
 Carlo method indicate that the quasiparticle effective mass decreases when
  the density is reduced\, especially in the ferromagnetic case. I will als
 o discuss our new results for the zero-temperature phase diagram of the th
 ree-dimensional homogeneous electron gas at very low density. Unlike previ
 ous studies\, our results show that the electron gas undergoes a first-ord
 er quantum phase transition directly from a paramagnetic fluid to a body-c
 entered cubic crystal at density parameter r_s = 86.6(7)\, with no region 
 of stability for an itinerant ferromagnetic fluid.
LOCATION:TCM Seminar Room\, Cavendish Laboratory\, Department of Physics
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