Floquet Topological Semimetal with Nodal Helix - Revision history

LeeMyeongwon at 10:09, 17 October 2018

2018-10-17T10:09:13Z

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	Image:K-W_Kim_Seminar_3.jpg		Image:K-W_Kim_Seminar_3.jpg
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	{{Media/Button\|K-KW2018d.pdf\|Talk slides}}		{{Media/Button\|K-KW2018d.pdf\|Talk slides}}

LeeMyeongwon at 01:50, 11 October 2018

2018-10-11T01:50:36Z

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	Topological semimetals with nodal line are a novel class of topological matter extending the concept of topological matter beyond topological insulators and Weyl/Dirac semimetals. Here, we show that a Floquet topological semimetal with nodal helix can be generated by irradiating graphene or the surface of a topological insulator with circularly polarized light. Nodal helix is a form of nodal line running across the Brillouin zone with helical winding. Specifically, it is shown that the dynamics of irradiated graphene is described by the time Stark Hamiltonian, which can host a Floquet topological insulator and a weakly driven Floquet topological semimetal with nodal helix in the high and low frequency limits, respectively. It is predicted that, at low frequency, the $\pi $ shift of the Zak phase generates a topological discontinuity along the projected nodal helix in the momentum spectrum of the Floquet states. At intermediate frequency, this topological discontinuity can create an interesting change of patterns in the quasienergy dispersion of the Floquet states.		Topological semimetals with nodal line are a novel class of topological matter extending the concept of topological matter beyond topological insulators and Weyl/Dirac semimetals. Here, we show that a Floquet topological semimetal with nodal helix can be generated by irradiating graphene or the surface of a topological insulator with circularly polarized light. Nodal helix is a form of nodal line running across the Brillouin zone with helical winding. Specifically, it is shown that the dynamics of irradiated graphene is described by the time Stark Hamiltonian, which can host a Floquet topological insulator and a weakly driven Floquet topological semimetal with nodal helix in the high and low frequency limits, respectively. It is predicted that, at low frequency, the $\pi $ shift of the Zak phase generates a topological discontinuity along the projected nodal helix in the momentum spectrum of the Floquet states. At intermediate frequency, this topological discontinuity can create an interesting change of patterns in the quasienergy dispersion of the Floquet states.

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			Image:K-W_Kim_Seminar_1.jpg
			Image:K-W_Kim_Seminar_2.jpg
			Image:K-W_Kim_Seminar_3.jpg
			</gallery>

	{{Media/Button\|K-KW2018d.pdf\|Talk slides}}		{{Media/Button\|K-KW2018d.pdf\|Talk slides}}

Mahnsoo.Choi: Protected "Floquet Topological Semimetal with Nodal Helix" ([Edit=⧼protect-level-board⧽] (indefinite) [Move=⧼protect-level-board⧽] (indefinite))

2018-10-03T08:54:48Z

Protected "Floquet Topological Semimetal with Nodal Helix" ([Edit=⧼protect-level-board⧽] (indefinite) [Move=⧼protect-level-board⧽] (indefinite))

← Older revision	Revision as of 08:54, 3 October 2018
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LeeMyeongwon at 00:55, 27 September 2018

2018-09-27T00:55:26Z

← Older revision		Revision as of 00:55, 27 September 2018
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	[[file:K-W_Kim.jpg\|thumb\|x300px\|Dr. ~~Kim,~~ Kun Woo (IBS PCS)]]		[[file:K-W_Kim.jpg\|thumb\|x300px\|Dr. Kun Woo Kim (IBS PCS)]]
	* Speaker: Dr. [[Kim, Kun Woo\|Kun Woo Kim]] (IBS PCS)		* Speaker: Dr. [[Kim, Kun Woo\|Kun Woo Kim]] (IBS PCS)
	* Date: Wednesday, October 10, 2018, at 17:00		* Date: Wednesday, October 10, 2018, at 17:00

LeeMyeongwon at 00:51, 27 September 2018

2018-09-27T00:51:53Z

← Older revision		Revision as of 00:51, 27 September 2018
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	* Date: Wednesday, October 10, 2018, at 17:00		* Date: Wednesday, October 10, 2018, at 17:00
	* Place: Jungho Seminar		* Place: Jungho Seminar


	Topological semimetals with nodal line are a novel class of topological matter extending the concept of topological matter beyond topological insulators and Weyl/Dirac semimetals. Here, we show that a Floquet topological semimetal with nodal helix can be generated by irradiating graphene or the surface of a topological insulator with circularly polarized light. Nodal helix is a form of nodal line running across the Brillouin zone with helical winding. Specifically, it is shown that the dynamics of irradiated graphene is described by the time Stark Hamiltonian, which can host a Floquet topological insulator and a weakly driven Floquet topological semimetal with nodal helix in the high and low frequency limits, respectively. It is predicted that, at low frequency, the $\pi $ shift of the Zak phase generates a topological discontinuity along the projected nodal helix in the momentum spectrum of the Floquet states. At intermediate frequency, this topological discontinuity can create an interesting change of patterns in the quasienergy dispersion of the Floquet states.		Topological semimetals with nodal line are a novel class of topological matter extending the concept of topological matter beyond topological insulators and Weyl/Dirac semimetals. Here, we show that a Floquet topological semimetal with nodal helix can be generated by irradiating graphene or the surface of a topological insulator with circularly polarized light. Nodal helix is a form of nodal line running across the Brillouin zone with helical winding. Specifically, it is shown that the dynamics of irradiated graphene is described by the time Stark Hamiltonian, which can host a Floquet topological insulator and a weakly driven Floquet topological semimetal with nodal helix in the high and low frequency limits, respectively. It is predicted that, at low frequency, the $\pi $ shift of the Zak phase generates a topological discontinuity along the projected nodal helix in the momentum spectrum of the Floquet states. At intermediate frequency, this topological discontinuity can create an interesting change of patterns in the quasienergy dispersion of the Floquet states.


	{{Media/Button\|K-KW2018d.pdf\|Talk slides}}		{{Media/Button\|K-KW2018d.pdf\|Talk slides}}

LeeMyeongwon: Created page with "Dr. Kim, Kun Woo (IBS PCS) * Speaker: Dr. Kun Woo Kim (IBS PCS) * Date: Wednesday, October 10, 2018, at 17:00 * Place: Jungh..."

2018-09-27T00:49:26Z

Created page with "thumb|x300px|Dr. Kim, Kun Woo (IBS PCS) * Speaker: Dr. Kun Woo Kim (IBS PCS) * Date: Wednesday, October 10, 2018, at 17:00 * Place: Jungh..."

New page

[[file:K-W_Kim.jpg|thumb|x300px|Dr. Kim, Kun Woo (IBS PCS)]]
* Speaker: Dr. [[Kim, Kun Woo|Kun Woo Kim]] (IBS PCS)
* Date: Wednesday, October 10, 2018, at 17:00
* Place: Jungho Seminar

Topological semimetals with nodal line are a novel class of topological matter extending the concept of topological matter beyond topological insulators and Weyl/Dirac semimetals. Here, we show that a Floquet topological semimetal with nodal helix can be generated by irradiating graphene or the surface of a topological insulator with circularly polarized light. Nodal helix is a form of nodal line running across the Brillouin zone with helical winding. Specifically, it is shown that the dynamics of irradiated graphene is described by the time Stark Hamiltonian, which can host a Floquet topological insulator and a weakly driven Floquet topological semimetal with nodal helix in the high and low frequency limits, respectively. It is predicted that, at low frequency, the $\pi $ shift of the Zak phase generates a topological discontinuity along the projected nodal helix in the momentum spectrum of the Floquet states. At intermediate frequency, this topological discontinuity can create an interesting change of patterns in the quasienergy dispersion of the Floquet states.

{{Media/Button|K-KW2018d.pdf|Talk slides}}

[[Category:Condensed Matter Seminars]]
[[Category:Seminars]]