Journal
PHYSICAL REVIEW B
Volume 81, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.041410
Keywords
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Funding
- National Natural Science Foundation of China [10504011, 60825402]
- State Key Program for Basic Researches of China [2006CB921803, 2009CB929504, 2010CB923401]
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Using ultracold atoms trapped in an optical lattice, we form a line-centered-square lattice in the condensed-matter physics, where a crossover from massive to massless Dirac fermion behavior can be easily achieved by tuning the laser intensities. The present Dirac fermions satisfy a three-component quantum equation for pseudospin-1 fermions, resulting in a single Dirac cone in the energy spectrum, a flat band touching at the Dirac point, and a vanishing Berry's phase. Interestingly, the massless Dirac fermions here may exhibit an all-angle Klein tunneling; i.e., the barrier is completely transparent for all incident angles.
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