Theory Group Lunchtime Seminars
Scheduled seminars are listed below.
Announcements and reminders will be posted to the physics-theory-group-seminar list.
To join this list:
- Sign into your university email account via webmail.
- Click the settings icon along the top icon bar (looks like a cog/gear).
- In the "Search Outlook settings" box type "distribution groups" and click the top search result.
- Under "Distribution groups I belong to" click the icon with two little people and a "+" sign.
- Search for physics-theory-group-seminar and double click on the result.
- Click "join". You will then be added to the email list once approved by a moderator.
To leave this list:
- Sign into your university email account via webmail.
- Click the settings icon along the top icon bar (looks like a cog/gear).
- In the "Search Outlook settings" box type "distribution groups" and click the top search result.
- Under "Distribution groups I belong to" click
physics-theory-group-seminar. - Click the "leave" icon above the list (looks like two people with a minus sign to their bottom right).
[If you are a member of Theory group, you will receive seminar announcements via physics-theory or physics-theory-staff. You do NOT need to subscribe to the above mailing list as well.]
Frank Kruger (UCL), Suppression of topological Mott insulators and novel quantum criticality of interacting Dirac fermions on the honeycomb lattice
We consider the extended half-filled Hubbard model on the honeycomb lattice for second nearest neighbours interactions. Using a functional integral approach, we find that collective fluctuations suppress topological states and instead favour charge ordering, in agreement with previous numerical studies. However, we show that the critical point is not of the putative Dirac semimetal/Mott insulator variety. Due to the frustrated nature of the interactions, the charge-ordered ground state remains metallic with semi-Dirac excitations. We conjecture that this novel transition is not in the Gross-Neveu universality class.