AI Article Synopsis
- Excitons, which are pairs of electrons and holes held together by Coulomb forces, can form a superfluid at low temperatures due to their bosonic properties.
- The research involves directly imaging this exciton superfluid in a specific material setup (MoSe-WSe heterostructure), demonstrating a significant level of order across the sample.
- The study also details how variations in exciton density and temperature help construct a phase diagram, revealing that the superfluid state can persist up to 15 K, aligning well with theoretical expectations and paving the way for advancements in quantum devices and superfluid research.
Article Abstract
Excitons, which are Coulomb bound electron-hole pairs, are composite bosons and thus at low temperature can form a superfluid state with a single well-defined amplitude and phase. We directly image this macroscopic exciton superfluid state in an hBN-separated MoSe-WSe heterostructure. At high density, we identify quasi-long-range order over the entire active area of our sample, through spatially resolved coherence measurements. By varying the exciton density and sample temperature, we map out the phase diagram of the superfluid. We observe the superfluid phase persisting to a temperature of 15 K, which is in excellent agreement with theoretical predictions. This works paves the way to realizing on chip superfluid structures capable of studying fundamental physical behaviors and quantum devices that use superfluidity.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11698081 | PMC |
| http://dx.doi.org/10.1126/sciadv.adr1772 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Kolmogorov-Hinze Scales in Turbulent Superfluids.
Phys Rev Lett
December 2024
Department of Engineering Science, University of Electro-Communications, Tokyo 182-8585, Japan.
When a two-component mixture of immiscible fluids is stirred, the fluids are split into smaller domains with more vigorous stirring. We numerically investigate the sizes of such domains in a fully developed turbulent state of a two-component superfluid stirred with energy input rate ε. For the strongly immiscible condition, the typical domain size is shown to be proportional to ε^{-2/5}, as predicted by the Kolmogorov-Hinze theory in classical fluids.
View Article and Find Full Text PDFImaging interlayer exciton superfluidity in a 2D semiconductor heterostructure.
Sci Adv
January 2025
Department of Physics, University of Arizona, Tucson, AZ 85721, USA.
Article Synopsis
- Excitons, which are pairs of electrons and holes held together by Coulomb forces, can form a superfluid at low temperatures due to their bosonic properties.
- The research involves directly imaging this exciton superfluid in a specific material setup (MoSe-WSe heterostructure), demonstrating a significant level of order across the sample.
- The study also details how variations in exciton density and temperature help construct a phase diagram, revealing that the superfluid state can persist up to 15 K, aligning well with theoretical expectations and paving the way for advancements in quantum devices and superfluid research.
Observation of 1/3 fractional quantum Hall physics in balanced large angle twisted bilayer graphene.
Nat Commun
January 2025
Department of Physics and Chemistry, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 42988, Republic of Korea.
Magnetotransport of conventional semiconductor based double layer systems with barrier suppressed interlayer tunneling has been a rewarding subject due to the emergence of an interlayer coherent state that behaves as an excitonic superfluid. Large angle twisted bilayer graphene offers unprecedented strong interlayer Coulomb interaction, since both layer thickness and layer spacing are of atomic scale and a barrier is no more needed as the twist induced momentum mismatch suppresses tunneling. The extra valley degree of freedom also adds richness.
View Article and Find Full Text PDFDark State Transport between Unitary Fermi Superfluids.
Phys Rev Lett
November 2024
Institute for Quantum Electronics and Quantum Center, ETH Zürich, 8093 Zürich, Switzerland.
The formation of dark states is an important concept in quantum sciences, but its compatibility with strong interparticle interactions-for example, in a quantum degenerate gas-is hardly explored. Here, we realize a dark state in one of the spins of a two-component, resonantly interacting Fermi gas using a Λ system within the D_{2} transitions of ^{6}Li at high magnetic field. The dark state is created in a micrometer-sized region within a one-dimensional channel connecting two superfluid reservoirs.
View Article and Find Full Text PDFStrange Metal and Superconductor in the Two-Dimensional Yukawa-Sachdev-Ye-Kitaev Model.
Phys Rev Lett
November 2024
Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
The two-dimensional Yukawa-Sachdev-Ye-Kitaev (2D-YSYK) model provides a universal theory of quantum phase transitions in metals in the presence of quenched random spatial fluctuations in the local position of the quantum critical point. It has a Fermi surface coupled to a scalar field by spatially random Yukawa interactions. We present full numerical solutions of a self-consistent disorder averaged analysis of the 2D-YSYK model in both the normal and superconducting states, obtaining electronic spectral functions, frequency-dependent conductivity, and superfluid stiffness.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!