Effect of Rashba Impurities on Surface State of a Topological Kondo Insulator
Abstract
:1. Introduction
2. Periodic Anderson Model
2.1. Model
2.2. Slave-Boson Protocol
3. Surface State
3.1. Surface States
- Here The Fermi velocity is given by . With the parameter choice and = 50 meV, we find the estimated value The hybridization parameter V cannot contribute here as we have chosen an ortho-normal function to obtain the Hamiltonian for the slab structure fromthe bulk Hamiltonian. It must be noted that [27] have found an expression of the Fermi velocity which with the same set of parameter values as above and yields nearly the same value as obtained by us. (In fact, they derived the surface state dispersion and found that the Fermi velocity for the electrons is vF = 4|V | (|tf1 td1|(td1 − tf1)2)1/2. This result implies that the effective mass of the surface electrons m* = pF/vF is quite heavy since the hybridization amplitude is small compared to other relevant energy scale, while the expression under the square root is of the order O(1)). The Kondo screening length ξ (=) for the surface states will be, therefore, be one order of magnitude higher than the lattice constant(a) for the surface Kondo temperature .
3.2. Plasmon Frequency
3.3. Surface Spectrum with Rashba Coupling
4. Discussion and Concluding Remarks
Funding
Conflicts of Interest
Appendix A
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Goswami, P. Effect of Rashba Impurities on Surface State of a Topological Kondo Insulator. Surfaces 2020, 3, 484-504. https://doi.org/10.3390/surfaces3030035
Goswami P. Effect of Rashba Impurities on Surface State of a Topological Kondo Insulator. Surfaces. 2020; 3(3):484-504. https://doi.org/10.3390/surfaces3030035
Chicago/Turabian StyleGoswami, Partha. 2020. "Effect of Rashba Impurities on Surface State of a Topological Kondo Insulator" Surfaces 3, no. 3: 484-504. https://doi.org/10.3390/surfaces3030035