“…Moreover, we uncover that the half-missing Umklapp process is derived from the glide mirror symmetry, thus identify a non-symmorphic effect on quasiparticle interferences. …”
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“…Scattering processes involving large momentum transfers, Umklapp processes, play a crucial role in the formation of Cooper pairs. …”
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“…At quarter filling, the unequal on-site repulsion ([Formula: see text] ) causes the occurrence of umklapp processes and the generation of a charge excitation gap. …”
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“…By taking into account of Umklapp processes, we find they are the major contribution in the electron-phonon coupling in superconductivity and enhance the transition temperature T(c).…”
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“…In this work we investigate the Heisenberg spin-chain compound YbAlO(3) and show that the weak interchain coupling causes Umklapp scattering between the left- and right-moving fermions and stabilizes an incommensurate spin-density wave order at q = 2k(F) under finite magnetic fields. These Umklapp processes open a route to multiple coherent scattering of fermions, which results in the formation of satellites at integer multiples of the incommensurate fundamental wavevector Q = nq. …”
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“…In this work, by adopting a set of real asymmetric normal mode amplitudes, we first discriminate the normal and Umklapp processes directly from atomistic dynamics. We then demonstrate that the undulating harmonic and anharmonic potentials, which allow a number of interaction pathways, generate several total-energy-conserving forward and backward scattering events including those which are traditionally considered as quantum-forbidden. …”
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