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Heavy Fermions

All articles tagged with #heavy fermions

science-and-technology1 year ago

"Breakthrough: Scientists Uncover 2D Quantum Material with 100x More Mass"

Scientists from Uppsala and Columbia University have discovered a new 2D quantum material, CeSiI, with heavy fermions, marking the first instance of heavy fermions in a 2D structure. This breakthrough paves the way for advanced studies on quantum phenomena and the development of materials with tailored quantum properties. The material's unique 2D-like crystal structure with clearly separated, atom-thin layers opens up new possibilities for investigating correlated electron structures and creating materials with customized quantum properties.

via SciTechDaily|
#2d-structure#columbia-university#heavy-fermions
science2 years ago

"Novel 2D Van der Waals Metal Traps Heavy Electrons"

Researchers have discovered a two-dimensional heavy fermion system in the van der Waals metal CeSiI, which exhibits intriguing quantum criticality and superconductivity. This finding opens up new possibilities for studying the behavior of heavy fermions in two dimensions and exploring the potential applications of van der Waals materials in superconducting technologies. The data supporting the study are available in the paper and its Extended Data, with additional data accessible from the corresponding authors upon request.

via Nature.com|
#heavy-fermions#quantum-criticality#science
physics2 years ago

"Semiconductor Lattice Unites Electrons and Magnetic Moments"

Physicists have created a model system by stacking a pair of monolayer semiconductors to study the Kondo lattice problem, which involves a regular lattice of magnetic moments. The researchers simulated the Kondo lattice by rotating the layers at a 180-degree angle, resulting in a moiré lattice pattern that traps individual electrons in tiny slots. The simplified Kondo lattice only needs a battery, and when a voltage is applied just right, the material is ordered into forming a lattice of spins, producing a continuously tunable system. The tunability can induce quantum phase transitions whereby heavy electrons turn into light electrons with the possible emergence of a "strange" metal phase.

via Phys.org|
#heavy-fermions#kondo-effect#physics
physics2 years ago

Controlling Heavy Fermions with Moiré Kondo Lattice Gates.

Researchers have realized a synthetic Kondo lattice in AB-stacked MoTe2/WSe2 moiré bilayers, in which the MoTe2 layer is tuned to a Mott insulating state, supporting a triangular moiré lattice of local moments, and the WSe2 layer is doped with itinerant conduction carriers. They observed heavy fermions with a large Fermi surface below the Kondo temperature and demonstrated widely and continuously gate-tunable Kondo temperatures through either the itinerant carrier density or the Kondo interaction. This study opens the possibility of in situ access to the phase diagram of the Kondo lattice with exotic quantum criticalities in a single device based on semiconductor moiré materials.

via Nature.com|
#gate-tunable#heavy-fermions#kondo-lattice