Adiabatic spin cooling using high-spin Fermi gases
| Autor: | Carsten Klempt, T. Vekua, Maria Colomé-Tatché, Luis Santos |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Fermi gas
Spatial entropy media_common.quotation_subject Entropy General Physics and Astronomy Frustration FOS: Physical sciences Zeeman coupling Adiabatic cooling Bethe ansatz symbols.namesake Lattice gas Antiferromagnetic orders Antiferromagnetism ddc:530 Adiabatic process Fermions media_common Physics Condensed Matter::Quantum Gases Spinor Zeeman effect Condensed matter physics Fermion High temperature Thermodynamic bethe ansatz Electron gas Quantum Gases (cond-mat.quant-gas) Ultra-cold Mott phase symbols Condensed Matter::Strongly Correlated Electrons Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik Condensed Matter - Quantum Gases Cooling Spin degrees |
| Zdroj: | New Journal of Physics 13 (2011) |
| Popis: | Spatial entropy redistribution plays a key role in adiabatic cooling of ultra-cold lattice gases. We show that high-spin fermions with a spatially variable quadratic Zeeman coupling may allow for the creation of an inner spin-1/2 core surrounded by high-spin wings. The latter are always more entropic than the core at high temperatures and, remarkably, at all temperatures in the presence of frustration. Combining thermodynamic Bethe Ansatz with local density approximation, we study the spatial entropy distribution for the particular case of one-dimensional spin-3/2 lattice fermions in the Mott phase. Interestingly, this spatially dependent entropy opens a possible path for an adiabatic cooling technique that, in contrast to previous proposals, would specifically target the spin degree of freedom. We discuss a possible realization of this adiabatic cooling, which may allow for a highly efficient entropy decrease in the spin-1/2 core and help access antiferromagnetic order in experiments on ultracold spinor fermions. 9 pages, 5 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|