<i>In Situ</i>Thin Film Growth Stresses during Chemical Ordering

Fu, Bianzhu; An, Wei; Turner, C. Heath; Thompson, Gregory B.

doi:10.1103/physrevlett.105.096101

Cited by 23 publications

(11 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Another intriguing compound is Cu x (PbSe) 5 (Bi 2 Se 3 ) 6 , where the doped topological insulator Cu x Bi 2 Se 3 is combined with the topologically trivial insulator PbSe [179]. Cu x Bi 2 Se 3 has attracted much attention as a candidate topological superconductor with a full (odd-parity) gap [182,183,184]. Surprisingly, specific heat measurements appear to indicate that the superconducting gap in Cu x (PbSe) 5 (Bi 2 Se 3 ) 6 has line nodes.…”

Section: Nodal Superconductors With Spin-singlet Pairingmentioning

confidence: 99%

Topological surface states in nodal superconductors

Schnyder

Brydon

2015

J. Phys.: Condens. Matter

157

190

View full text Add to dashboard Cite

In this work, we show that a giant spin current can be injected into a nodal topological supercon-ductor, using a normal paramagnetic lead, through a large number of zero energy Majorana fermions at the superconductor edge. The giant spin current is caused by the selective equal spin Andreev reflections (SESAR) induced by Majorana fermions. In each SESAR event, a pair of electrons with certain spin polarization are injected into the nodal topological superconductor, even though the pairing in the bulk of the nodal superconductor is spin-singlet s-wave. We further explain the origin of the spin current by showing that the pairing correlation at the edge of a nodal topological superconductor is predominantly equal spin-triplet at zero energy. The experimental consequences of SESAR in nodal topological superconductors are discussed. Introduction-The search for Majorana fermions in condensed matter systems has been an important topic in recent years [1-5]. This search is strongly motivated by the fact that Majorana fermions are non-Abelian particles and have potential applications in quantum computation [6-8]. Recently, it was further pointed out that Majorana fermions, due to their self-Hermitian properties , could induce spin currents in paramagnetic leads [9-11] and correlated spin currents in spatially separated leads [12, 13]. These properties make it possible for Ma-jorana fermions to have potential applications in super-conducting spintronics [14, 15]. In particular, it was pointed out that a single Majo-rana end state of a topological superconducting wire can induce the so-called selective equal spin Andreev reflection (SESAR) at the normal lead/topological supercon-ductor (N/TS) interface [9]. In SESAR processes, only electrons with certain spin polarization n in the normal lead can couple to the Majorana fermion and undergo Andreev reflections. Importantly, the reflected holes are due to missing electrons with the same spin polarization n below the Fermi energy. As a result, two electrons with equal spin tunnel into the superconducting wire and form a spin-triplet Cooper pair in each Andreev reflection event. On the other hand, electrons with opposite spin polarization −n in the normal lead are decoupled from the Majorana fermion and get reflected as electrons with unchanged spin. Therefore, a spin current with spin polarization in the n direction can be injected into the superconductor using a paramagnetic lead. At the same time, a spin current is generated in the lead. In this work, instead of studying isolated Majorana modes, we study the spin transport properties of the 2D nodal topological superconductor with a large number of spatially overlapping zero energy Majorana modes at the sample edge [16-19]. The zero energy edge modes are associated with Majorana flat band (MFB), which connects the nodal points of the superconductor in the projected band structure. These flat bands are analogous to the surface Fermi arcs connecting the Weyl points in Weyl semimetals [20, 21]. Specifically, we consider a 2D ...

show abstract

Section: Nodal Superconductors With Spin-singlet Pairingmentioning

confidence: 99%

Topological surface states in nodal superconductors

Schnyder

Brydon

2015

J. Phys.: Condens. Matter

157

190

View full text Add to dashboard Cite

show abstract

“…Molecular dynamics (MD) simulations, which have been shown to be a powerful tool in investigating thin film growth [30][31][32][33], were performed by utilizing the LAMMPS code [34] with the Ti-Nb binary embedded atom model potential found in Ref. [35].…”

Section: Experimental and Computational Detailsmentioning

confidence: 99%

Phase stability and in situ growth stresses in Ti/Nb thin films

Wan¹,

Yu²,

Thompson³

2014

Acta Materialia

View full text Add to dashboard Cite

“…To describe electronic states of STI, we start with the Bogoliubov-de Gennes Hamiltonian proposed in Ref. [33],…”

Section: Modelmentioning

confidence: 99%

“…Nevertheless, more recently, Mizushima et al theoretically has shown that simple Ushaped spectra can not be realized by non-topological pairing due to the inevitable mixing of pair potentials with different symmetry on the surface [32]. Since the pairing symmetry of this material has not been clarified yet, it is a hot topic to reveal the unconventional superconductivity [33][34][35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Effect of Fermi surface evolution on superconducting gap in superconducting topological insulator

Hashimoto¹,

Yada²,

Yamakage³

et al. 2014

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Abstract. We study bulk electronic states of superconducting topological insulator, which is the promising candidate for topological superconductor. Recent experiments suggest that the three-dimensional Fermi surface evolves into two-dimensional one. We show that the superconducting energy gap structure on the Fermi surface systematically changes with this evolution. It is clarified that the bulk electronic properties such as spin-lattice relaxation rate and specific heat depend on the shape of the Fermi surface and the type of the energy gap function. These results serve as a guide to determine the pairing symmetry of CuxBi2Se3.

show abstract

In SituThin Film Growth Stresses during Chemical Ordering

Cited by 23 publications

References 24 publications

Topological surface states in nodal superconductors

Topological surface states in nodal superconductors

Phase stability and in situ growth stresses in Ti/Nb thin films

Effect of Fermi surface evolution on superconducting gap in superconducting topological insulator

Contact Info

Product

Resources

About