Helical superconductivity and charge density waves in strongly correlated 2D materials

MAY 12, 2020 | 2:30 PM TO 3:30 PM



The Graduate Center
365 Fifth Avenue


May 12, 2020: 2:30 PM-3:30 PM




Initiative for the Theoretical Sciences


ITS seminar with Chris Hooley (University of St Andrews, UK) 

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Meeting will open half-hour prior to seminar at 2PM EDT

Recent experiments on thin films of transition metal oxides and transition metal dichalcogenides have increased the incentive for improved theoretical predictions of the phase diagrams of such systems.  Spin-orbit interactions, density-of-states effects, and nesting are all important contributors, and necessitate forms of renormalization treatment that can track the feedback between multiple incipient orders.

In this talk, I present two pieces of recent work on this topic carried out by my final-year PhD student Matt Trott and myself.  In the first [1], we analyze a model of a 2D metal with strong spin-orbit coupling near a Lifshitz (i.e. Fermi surface reconnection) transition, and show that mixed-parity superconductivity with a helical triplet component is generally expected.  In the second [2], we study a model of the Fermi surface of VSe2, and show that – as well as various superconducting phases – charge-density-wave formation is possible via a purely electronic mechanism.

[1] M. J. Trott and CAH, Phys. Rev. Research 2, 013106 (2020).

[2] M. J. Trott and CAH, arXiv:2004.06665, under review at Nature Communications Physics.