Second-Order Josephson Effect in Excitonic Insulators.

@article{Sun2021SecondOrderJE,
  title={Second-Order Josephson Effect in Excitonic Insulators.},
  author={Zhiyuan Sun and Tatsuya Kaneko and Denis Gole{\vz} and Andrew J. Millis},
  journal={Physical review letters},
  year={2021},
  volume={127 12},
  pages={
          127702
        }
}
We show that in electron-hole bilayers with excitonic orders arising from conduction and valence bands formed by atomic orbitals that have different parities, nonzero interlayer tunneling leads to a second-order Josephson effect. This means the interlayer electrical current is related to the phase of the excitonic order parameter as J=J_{c}sin2θ instead of J=J_{c}sinθ and that the system has two degenerate ground states at θ=0,π that can be switched by an interlayer voltage pulse. When… Expand
2 Citations

Figures from this paper

A compact device sustains a fluid of bosons.
Strongly correlated excitonic insulator in atomic double layers
Excitonic insulators (EIs) arise from the formation of bound electron-hole pairs (excitons) in semiconductors and provide a solid-state platform for quantum many-boson physics. StrongExpand

References

SHOWING 1-10 OF 51 REFERENCES
Theory of competing excitonic orders in insulating WTe2 monolayers
We develop a theory of the excitonic phase recently proposed as the zero-field insulating state observed near charge neutrality in monolayer WTe$_2$. Using a Hartree-Fock approximation, weExpand
A monolayer transition-metal dichalcogenide as a topological excitonic insulator
TLDR
A theoretical study shows that a single layer of a metal dichalcogenide can become a topological insulator for excitons in a monolayer system. Expand
High-temperature superfluidity with indirect excitons in van der Waals heterostructures.
TLDR
A design for artificially structured materials to rival the present record for high-critical temperature cuprate superconductors by exhibiting macroscopic occupation of a quantum state and vanishing viscosity at high temperatures. Expand
Gate-Tuned Spontaneous Exciton Insulator in Double-Quantum Wells
It was proposed that a dilute semimetal is unstable against the formation of an exciton insulator, however experimental confirmations have remained elusive. We investigate the origin of bulk energyExpand
Coherent order parameter oscillations in the ground state of the excitonic insulator Ta2NiSe5
TLDR
Using nonlinear excitations with short laser pulses, ultrafast spectroscopy identifies a phonon-coupled state of the condensate that can be understood as a novel amplitude mode and characterizes the transient order parameter of the excitonic insulator as a function of temperature and excitation density. Expand
Exciton Condensation in Bilayer Quantum Hall Systems
The condensation of excitons, bound electron-hole pairs in a solid, into a coherent collective electronic state was predicted more than 50 years ago. Perhaps surprisingly, the phenomenon was firstExpand
Bulk Photovoltaic Effect Driven by Collective Excitations in a Correlated Insulator.
TLDR
The findings establish that correlation effects can lead to the bulk photovoltaic effect and demonstrate that the collective behavior of ordered states can yield large nonlinear optical responses. Expand
Gate tuning from exciton superfluid to quantum anomalous Hall in van der Waals heterobilayer
TLDR
It is shown that heterobilayers of 2D valley semiconductors can be tuned through interlayer bias between an exciton superfluid, a quantum anomalous Hall insulator, and a QSH insulator. Expand
Evidence of high-temperature exciton condensation in two-dimensional atomic double layers
TLDR
This study provides evidence for interlayer exciton condensation in two-dimensional atomic double layers and opens up opportunities for exploring condensate-based optoelectronics and exciton-mediated high-temperature superconductivity. Expand
Macroscopically ordered state in an exciton system
TLDR
Photoluminescence measurements of a quasi-two-dimensional exciton gas in GaAs/AlGaAs coupled quantum wells and the observation of a macroscopically ordered exciton state are reported. Expand
...
1
2
3
4
5
...