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Title: Fermi Gases in Bichromatic Superlattices

Abstract

The purpose of the program is the broad study of designer materials made of ultra-cold atoms and light, which provides new paradigms for emulating exotic layered systems. Bichromatic superlattices enable control and study of both dimensionality and dispersion in layered, strongly correlated Fermi gases, to model high-temperature superfluidity/superconductivity. Most layered materials are quasi-two-dimensional, neither two-dimensional, like a sheet, nor three-dimensional, like a gas, but somewhere in between. In quasi-2D layers with an unequal number of spin-up and spin-down electrons, particularly strong attraction between pairs of electrons with opposite spins is predicted to achieve the highest possible superconducting transition temperatures. To understand these materials, we emulate them with a layered, ultra-cold Fermi gas of 6Li atoms, magnetically tuned near a collisional (Feshbach) resonance, where precise control of the attraction, spin-composition, dimensionality and dispersion provides new tests of theory. The primary goals are of the program are: (1) Elucidation of the effects of dimensionality and confining potential shape on the enhancement of high-temperature superfluidity in a layered, strongly correlated Fermi gases; (2) Control of dispersion and the study of tunable Dirac points in one dimension.

Authors:
ORCiD logo
Publication Date:
Research Org.:
North Carolina State Univ., Raleigh, NC (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1573239
Report Number(s):
DOE-NCSU-08646
DOE Contract Number:  
SC0008646
Resource Type:
Technical Report
Resource Relation:
Related Information: A) Experimental work that is primarily supported by DOE 1) Chingyun Cheng, J. Kangara, I. Arakelyan, and J. E. Thomas, “Fermi Gases in the Two-Dimensional to Quasi-Two-Dimensional Crossover,” Phys. Rev. A 94, 031606(R) (2016). 2) J. Kangara, Chingyun Cheng, S. Pegahan, I. Arakelyan, and J. E. Thomas, ``Atom Pairing in Optical Superlattices," Physical Review Letters 120, 083203 (2018), Editor's Suggestion. 3) S. Pegahan, J. Kangara, I. Arakelyan and J. E. Thomas, ``Spin-Energy Correlation in Degenerate Weakly-Interacting Fermi Gases," Physical Review A 99, 063620 (2019), Editor's Suggestion. B) Experimental work that acknowledges support from DOE 4) N. Arunkumar, A. Jagannathan, and J. E. Thomas, ``Probing Energy-Dependent Feshbach Resonances by Optical Control," Physical Review Letters 121, 1630404 (2018). 5) N. Arunkumar, A. Jagannathan, and J. E. Thomas, ``Designer Spatial Control of Interactions in Ultracold Gases," Physical Review Letters 122, 040405 (2019). 6) Lorin Baird, Xin Wang, Stetson Roof and J. E. Thomas, ``Measuring the Hydrodynamic Linear Response of a Unitary Fermi Gas," Physical Review Letters 123, 160402 (2019), Editor's Suggestion.
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE

Citation Formats

Thomas, John E. Fermi Gases in Bichromatic Superlattices. United States: N. p., 2019. Web. doi:10.2172/1573239.
Thomas, John E. Fermi Gases in Bichromatic Superlattices. United States. doi:10.2172/1573239.
Thomas, John E. Wed . "Fermi Gases in Bichromatic Superlattices". United States. doi:10.2172/1573239. https://www.osti.gov/servlets/purl/1573239.
@article{osti_1573239,
title = {Fermi Gases in Bichromatic Superlattices},
author = {Thomas, John E.},
abstractNote = {The purpose of the program is the broad study of designer materials made of ultra-cold atoms and light, which provides new paradigms for emulating exotic layered systems. Bichromatic superlattices enable control and study of both dimensionality and dispersion in layered, strongly correlated Fermi gases, to model high-temperature superfluidity/superconductivity. Most layered materials are quasi-two-dimensional, neither two-dimensional, like a sheet, nor three-dimensional, like a gas, but somewhere in between. In quasi-2D layers with an unequal number of spin-up and spin-down electrons, particularly strong attraction between pairs of electrons with opposite spins is predicted to achieve the highest possible superconducting transition temperatures. To understand these materials, we emulate them with a layered, ultra-cold Fermi gas of 6Li atoms, magnetically tuned near a collisional (Feshbach) resonance, where precise control of the attraction, spin-composition, dimensionality and dispersion provides new tests of theory. The primary goals are of the program are: (1) Elucidation of the effects of dimensionality and confining potential shape on the enhancement of high-temperature superfluidity in a layered, strongly correlated Fermi gases; (2) Control of dispersion and the study of tunable Dirac points in one dimension.},
doi = {10.2172/1573239},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {11}
}