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Friday, January 22nd 2016

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Friday, January 29th 2016

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Friday, February 5th 2016

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Friday, February 12th 2016

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Friday, February 19th 2016

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Friday, February 26th 2016

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Friday, March 4th 2016

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Friday, March 11th 2016

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Friday, March 18th 2016

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Friday, March 25th 2016

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Friday, April 1st 2016

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Friday, April 8th 2016

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Friday, April 15th 2016

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Friday, April 22nd 2016

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Friday, April 29th 2016

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Friday, May 6th 2016

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Friday, May 13th 2016

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Friday, September 9th 2016

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Friday, September 16th 2016

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Friday, September 23rd 2016

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Friday, September 30th 2016

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Friday, October 7th 2016

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Friday, October 14th 2016

12:20 pm:

In iron-based superconductors, superconductivity, magnetism and nematic orders are all observed. To understand the phase diagram and the interplay between different orders in iron-based superconductors, we use parquet renormalization group, an unbiased approach, to study the full four-pocket, 3-orbital low-energy model.

Starting from all symmetry-allowed interactions, we derive and analyze the RG flow of the couplings and susceptibilities. We obtain the hierarchy of competing instabilities and obtain, as limiting cases, the behavior, which was previously found in approximate models [A.V. Chubukov, M. Khodas and R.M. Fernandes, arxiv:1602.05503]. For parameters relevant to FeSe, we found that upon lowering the temperature, nematic order is the leading instability, followed by superconductivity, while the magnetic order doesn't appear. We found that the nematic order parameter has three components, and found particular relation between the components, consistent with ARPES experiment[A. Fedorov et al, arxiv:1606.03022].

Friday, October 21st 2016

12:20 pm:

Semiconductor nanowire with spin-orbit coupling and superconductivity from proximity effect is usually used as a model for topological superconductor. I will first talk about the topological phase transition for free electrons as well as interacting electrons. Then I'll discuss Majorana related tunneling problem and show a signature of Majorana.

Friday, October 28th 2016

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Friday, November 4th 2016

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Friday, November 11th 2016

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Friday, November 18th 2016

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Friday, November 25th 2016

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Friday, December 2nd 2016

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Friday, December 9th 2016

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Friday, December 16th 2016

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