Interaction Induced Staggered Spin-Orbit Order in Two-Dimensional Electron Gas

Das, Tanmoy

doi:10.1103/physrevlett.109.246406

Cited by 13 publications

(14 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among others, the spin-ordered Au-chain ensemble grown on Si(553) [12-14] and also magnetic chain structures on insulating or superconducting surfaces [15-17] are recent illustrations of this entanglement and have attracted a lot of research activities due to their full flexibility for manipulation with atomic precision. Reminiscent of antiferromagnetism in Cr [18], the problem of spin-orbit coupling (SOC)under consideration of electronic interaction has been revisited recently [11,19]. It was shown that inherent spin splitting such as Rashba-type SOC yields Fermi surfaces with nesting between opposite helical states causing a so-called spin-orbit density wave (SODW) state which cannot be characterized by independent local order parameters.…”

mentioning

confidence: 99%

“…Reminiscent of antiferromagnetism in Cr [18], the problem of spin-orbit coupling (SOC) under consideration of electronic interaction has been revisited recently [11,19]. It was shown that inherent spin splitting such as Rashba-type SOC yields Fermi surfaces with nesting between opposite helical states causing a so-called spin-orbit density wave (SODW) state which cannot be characterized by independent local order parameters.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Observation of correlated spin–orbit order in a strongly anisotropic quantum wire system

et al. 2015

Self Cite

View full text Add to dashboard Cite

Quantum wires with spin-orbit coupling provide a unique opportunity to simultaneously control the coupling strength and the screened Coulomb interactions where new exotic phases of matter can be explored. Here we report on the observation of an exotic spin-orbit density wave in Pb-atomic wires on Si(557) surfaces by mapping out the evolution of the modulated spin-texture at various conditions with spin-and angle-resolved photoelectron spectroscopy. The results are independently quantified by surface transport measurements. The spin polarization, coherence length, spin dephasing rate and the associated quasiparticle gap decrease simultaneously as the screened Coulomb interaction decreases with increasing excess coverage, providing a new mechanism for generating and manipulating a spin-orbit entanglement effect via electronic interaction. Despite clear evidence of spontaneous spin-rotation symmetry breaking and modulation of spin-momentum structure as a function of excess coverage, the average spin polarization over the Brillouin zone vanishes, indicating that time-reversal symmetry is intact as theoretically predicted.

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

Observation of correlated spin–orbit order in a strongly anisotropic quantum wire system

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…Given that the electron interaction is strong and tunable in 2DFG (ref. 24), novel broken symmetry phases are easy to yield in this heterostructure setup than in a weakly correlated 3D TI.…”

Section: Discussionmentioning

confidence: 91%

“…This ability thus will promote a unambiguous detection of non-Abelian particles [19,21,22] and anomalous Hall effect. Given that the electron interaction is strong and tunable in 2DFG, [24] novel broken symmetry phases are easy to yield in this heterostructure setup than in a weakly correlated 3D TI.…”

Section: Discussionmentioning

confidence: 99%

“…In principle one can envision to use the approach we propose and take it a few steps further. For example, a heterostructure setup allows one to introduce layers of magnetism, [21,22] superconductivity [19,20,23] and other exotic many body orders [24] within the topological matrix. Taken together, the search for TI materials that obey several symmetry properties and inherits spin-orbit coupling can thus be replaced with 'homemade' systems by generating spin-orbit coupling via external or internal electric fields, and by imposing symmetry properties via manipulating the heterostructure geometry.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Engineering three-dimensional topological insulators in Rashba-type spin-orbit coupled heterostructures

Das

Balatsky

2013

Nat Commun

Self Cite

View full text Add to dashboard Cite

Topological insulators represent a new class of quantum phase defined by invariant symmetries and spin-orbit coupling that guarantees metallic Dirac excitations at its surface. The discoveries of these states have sparked the hope of realizing non-trivial excitations and novel effects such as a magnetoelectric effect and topological Majorana excitations. Here we develop a theoretical formalism to show that a three-dimensional topological insulator can be designed artificially via stacking bilayers of two-dimensional Fermi gases with opposite Rashba-type spin-orbit coupling on adjacent layers, and with interlayer quantum tunneling. We demonstrate that in the stack of bilayers grown along a (001)-direction, a non-trivial topological phase transition occurs above a critical number of Rashba bilayers. In the topological phase, we find the formation of a single spin-polarized Dirac cone at the -point. This approach offers an accessible way to design artificial topological insulators in a set up that takes full advantage of the atomic layer deposition approach. This design principle is tunable and also allows us to bypass limitations imposed by bulk crystal geometry.

show abstract