Editing John Bardeen (section)

===University of Illinois at Urbana–Champaign===
[[File:Bardeen plaque uiuc.jpg|thumb|right|350px|A commemorative plaque remembering John Bardeen and the theory of superconductivity, at the [[University of Illinois at Urbana–Champaign]]]]

By 1951, Bardeen was looking for a new job. Fred Seitz, a friend of Bardeen, convinced the [[University of Illinois at Urbana–Champaign]] to make Bardeen an offer of $10,000 a year. Bardeen accepted the offer and left Bell Labs,<ref name="John Bardeen 2" /> joining the engineering and physics faculties at Illinois in 1951, where he was professor of electrical engineering and of physics.<ref name="knightridder">{{cite news |title=Nice Guys Can Finish As Geniuses at University of Illinois in Urbana-Champaign. |url=http://articles.chicagotribune.com/2003-01-25/business/0301250052_1_semiconductor-lasers-john-bardeen-true-genius|archive-url=https://web.archive.org/web/20151208160304/http://articles.chicagotribune.com/2003-01-25/business/0301250052_1_semiconductor-lasers-john-bardeen-true-genius|url-status=dead|archive-date=December 8, 2015|work=Chicago Tribune: Knight Ridder News Service |date=January 25, 2003 |access-date=August 3, 2007}}</ref>

At Illinois, he established two major research programs, one in the electrical engineering department and one in the physics department. The research program in the electrical engineering department dealt with both experimental and theoretical aspects of semiconductors, and the research program in the physics department dealt with theoretical aspects of macroscopic quantum systems, particularly superconductivity and quantum liquids.<ref>{{cite web |url=http://www.physics.uiuc.edu/history/bardeen.htm |title=Biography at the University of Illinois at Urbana-Champaign |access-date=November 6, 2007 |publisher=The University of Illinois at Urbana-Champaign |archive-url=https://web.archive.org/web/20071011195706/http://physics.uiuc.edu/history/bardeen.htm <!-- Bot retrieved archive --> |archive-date=October 11, 2007}}</ref>

He was an active professor at Illinois from 1951 to 1975 and then became ''professor emeritus''.<ref name="washpost" /> In his later life, Bardeen remained active in academic research, during which time he focused on understanding the flow of electrons in [[charge density wave]]s (CDWs) through metallic linear chain compounds. His proposals<ref>{{cite journal|last=Bardeen |first=John |title=Theory of non-ohmic conduction from charge-density waves in NbSe3 |journal=Physical Review Letters |year=1979 |volume=42 |issue=22 |pages=1498–1500 |doi=10.1103/PhysRevLett.42.1498 |bibcode=1979PhRvL..42.1498B}}</ref><ref>{{cite journal|last=Bardeen |first=John |title=Tunneling theory of charge-density-wave depinning |journal=Physical Review Letters |year=1980 |volume=45 |issue=24 |pages=1978–1980 |doi=10.1103/PhysRevLett.45.1978 |bibcode=1980PhRvL..45.1978B }}</ref><ref>{{cite journal|author1=J. H. Miller, Jr. |author2=J. Richard |author3=J. R. Tucker |author4=John Bardeen |title=Evidence for tunneling of charge-density waves in TaS3 |journal=Physical Review Letters |year=1983 |volume=51 |issue=17 |pages=1592–1595 |doi=10.1103/PhysRevLett.51.1592 |bibcode=1983PhRvL..51.1592M }}</ref> that CDW electron transport is a collective quantum phenomenon (see [[Macroscopic quantum phenomena]]) were initially greeted with skepticism.<ref>{{cite journal|last=Pines |first=David |title=Biographical Memoirs: John Bardeen |journal=Proceedings of the American Philosophical Society |year=2009 |volume=153 |issue=3 |pages=287–321 |url=http://www.amphilsoc.org/sites/default/files/5BardeenBio1530306.pdf |url-status=dead |archive-url=https://web.archive.org/web/20130524035311/http://www.amphilsoc.org/sites/default/files/5BardeenBio1530306.pdf |archive-date=May 24, 2013}}</ref>  However, experiments reported in 2012<ref>{{cite journal|author1=M. Tsubota |author2=K. Inagaki |author3=T. Matsuura |author4=S. Tanda |title=Aharonov-Bohm effect in charge-density wave loops with inherent temporal current switching|journal=EPL|year=2012|volume=97|issue=5|page=57011|doi=10.1209/0295-5075/97/57011|arxiv=0906.5206 |bibcode=2012EL.....9757011T|s2cid=119243023 }}</ref> show oscillations in CDW current versus magnetic flux through tantalum trisulfide rings, similar to the behavior of superconducting quantum interference devices (see [[SQUID]] and [[Aharonov–Bohm effect]]), lending credence to the idea that collective CDW electron transport is fundamentally quantum in nature.<ref>{{cite journal|author1=J. H. Miller, Jr. |author2=A.I. Wijesinghe |author3=Z. Tang |author4=A.M. Guloy |title=Correlated quantum transport of density wave electrons|journal=Physical Review Letters |year=2012 |volume=108 |issue=3 |page=036404 |doi=10.1103/PhysRevLett.108.036404 |arxiv=1109.4619 |bibcode=2012PhRvL.108c6404M |pmid=22400766|pmc=11524153 |s2cid=29510494 }}</ref><ref>{{cite journal|author1=J.H. Miller, Jr. |author2=A.I. Wijesinghe |author3=Z. Tang |author4=A.M. Guloy |title=Coherent quantum transport of charge density waves|journal=Physical Review B |volume=87 |issue=11 |pages=115127 |arxiv=1212.3020|bibcode=2013PhRvB..87k5127M|doi=10.1103/PhysRevB.87.115127|year=2013|s2cid=119241570 }}</ref> (See [[quantum mechanics]].) Bardeen continued his research throughout the 1980s, and published articles in ''[[Physical Review Letters]]''<ref>{{cite journal|last=Bardeen |first=John |title=Theory of size effects in depinning of charge-density waves |journal=Physical Review Letters |year=1990 |volume=64 |issue=19 |pages=2297–2299 |doi=10.1103/PhysRevLett.64.2297 |pmid=10041638 |bibcode=1990PhRvL..64.2297B }}</ref> and ''[[Physics Today]]''<ref>{{cite journal|last=Bardeen|first=John|title=Superconductivity and other macroscopic quantum phenomena|journal=Physics Today|year=1990|volume=43|issue=12|pages=25–31|doi=10.1063/1.881218|url=http://www.physicstoday.org/resource/1/phtoad/v43/i12/p25_s1|archive-url=https://archive.today/20130415170644/http://www.physicstoday.org/resource/1/phtoad/v43/i12/p25_s1|url-status=dead|archive-date=April 15, 2013|bibcode=1990PhT....43l..25B|url-access=subscription}}</ref> less than a year before he died.

A collection of Bardeen's personal papers are held by the University of Illinois Archives.<ref>{{cite web |url=https://archon.library.illinois.edu/?p=collections/findingaid&id=690&q=&rootcontentid=92733 |title=Finding Aid for John Bardeen Papers, 1910–91 |access-date=October 2, 2021 |publisher=The University of Illinois Archives}}</ref>