NLM IRP Seminar Schedule

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The NLM IRP holds a public weekly seminar series for NLM trainees, staff scientists, and investigators to share details on current and exciting research projects at NLM. Seminars take place on Tuesdays at 11:00 AM, EST and some Thursdays at 3:00 PM, EST. Seminars are held in the B2 Library of Building 38A on the main NIH campus in Bethesda, MD. Due to the Covid-19 pandemic, all seminars are currently held virtually.

To schedule a seminar, click the “Schedule Seminar” button to the right, select an appropriate date on the calendar to sign up, and then complete the form. You will need an NIH PIV card to access the “Schedule Seminar” page.

Please include seminars by invited visiting scientists in the NLM IRP seminar series. These need not be on a Tuesday or Thursday.

If you would like to schedule a seminar by a visiting scientist, click the “Schedule Seminar” and complete the form. Contact NLM_IRP_Seminar_Scheduling@mail.nih.gov with questions. Please follow this link to subscribe/unsubscribe to/from the NLM IRP seminar mailing list.

Titles and Abstracts for Upcoming Seminars


(based on the current date)

Wenya Rowe
April 30, 2024 at 11 a.m.

The conformal central charge of the spin-1/2 XX model derived from long-chain asymptotics

The spin-interacting models have wide applications in studying biological systems such as pattern generations, neural networks, and the spread of disease. In addition, the central charge of conformal field theory (CFT) could quantify the universality classes and give the magnitude of the Casimir effect. It has led to research on the categorization of cell membranes with multiple phases which have implications for cell trafficking and communications. To better understand the spin interaction systems, we revisit the well-known XX model, along with the energy spectrum and the ground state degeneracy. While imposing the translational invariance, we obtain the energy spectrum of the finite-length periodic chain via Jordan-Wigner transformation with suitable momentum mode choices. The finite open chain violates the translational symmetry and is solved by matrix analysis in addition to the Jordan-Wigner transformation. By investigating the long chain length asymptotics, we find different dominant correction terms for chains under open and periodic boundary conditions as well as for chains of even and odd number of sites. By comparing the asymptotic form of the ground state energy with the one from CFT, we confirm that the conformal central charge for the XX chain is c = 1 for the even chain lengths, albeit for open boundary conditions there exists an additional boundary energy term. For the odd number site chains, while the boundary energy for the open boundary remains the same, the system is not describable by CFT with the central charge c = 1.

OPEN
May 2, 2024 at 3 p.m.

TBD

OPEN
May 7, 2024 at 11 a.m.

TBD

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