"Real-Space Visualization of Remnant Mott Gap and Magnon Excitations "

Y. Wang: C. J. Jia, B. Moritz, and T. P. Devereaux ; Physical Review Letters, 04/14/14.

Additional Authors: C. J. Jia, B. Moritz, and T. P. Devereaux

Abstract:

We demonstrate the ability to visualize real-space dynamics of charge gap and magnon excitations in the Mott phase of the single-band Hubbard model and the remnants of these excitations with hole or electron doping. At short times, the character of magnetic and charge excitations is maintained even for large doping away from the Mott and antiferromagnetic phases. Doping influences both the real-space patterns and long timescales of these excitations with a clear carrier asymmetry attributable to particle-hole symmetry breaking in the underlying model. Further, a rapidly oscillating charge-density-wave-like pattern weakens, but persists as a visible demonstration of a subleading instability at half-filling which remains upon doping. The results offer an approach to analyzing the behavior of systems where momentum space is either inaccessible or poorly defined.