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Quantum Monte Carlo Simulation of Frustrated Kondo Lattice Models

Nov 8, 2017

6 pages

Published in:

Phys.Rev.Lett. 120 (2018) 10, 107201

Published: Mar 8, 2018

e-Print:

1711.03116 [cond-mat.str-el]

DOI:

10.1103/PhysRevLett.120.107201

View in:

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Abstract: (APS)

The absence of the negative sign problem in quantum Monte Carlo simulations of spin and fermion systems has different origins. World-line based algorithms for spins require positivity of matrix elements whereas auxiliary field approaches for fermions depend on symmetries such as particle-hole symmetry. For negative-sign-free spin and fermionic systems, we show that one can formulate a negative-sign-free auxiliary field quantum Monte Carlo algorithm that allows Kondo coupling of fermions with the spins. Using this general approach, we study a half-filled Kondo lattice model on the honeycomb lattice with geometric frustration. In addition to the conventional Kondo insulator and antiferromagnetically ordered phases, we find a partial Kondo screened state where spins are selectively screened so as to alleviate frustration, and the lattice rotation symmetry is broken nematically.

Note:

6 pages, 5 figures, supplemental material

References(45)

Figures(8)

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