Modulation Spectroscopy and Dynamics of Double Occupancies in a Fermionic Mott Insulator
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CitationSensarma, Rajdeep, David Pekker, Mikhail Lukin, and Eugene Demler. 2009. Modulation spectroscopy and dynamics of double occupancies in a fermionic mott insulator. Phys. Rev. Letters 103(3): 035303.
AbstractWe calculate the rate of creation of double occupancies in a 3D Fermionic Mott insulator near half-filling by modulation of optical lattice potential. At high temperatures, incoherent holes lead to a broad response peaked at the Hubbard repulsion \(U\). At low temperatures, antiferromagnetic order leads to a coherent peak for the hole along with broad features representing spin wave shake-off processes. This is manifested in the doublon creation rate as a sharp absorption edge and oscillations as a function of modulating frequency. Thus, modulation spectroscopy can be used as a probe of antiferromagnetic order and nature of quasiparticle excitations in the system.
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