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Measurements of Interaction-Driven S...

Feldman, Benjamin Ezekiel.

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Measurements of Interaction-Driven States in Monolayer and Bilayer Graphene.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Measurements of Interaction-Driven States in Monolayer and Bilayer Graphene./
作者:	Feldman, Benjamin Ezekiel.
面頁冊數:	162 p.
附註:	Source: Dissertation Abstracts International, Volume: 75-02(E), Section: B.
Contained By:	Dissertation Abstracts International75-02B(E).
標題:	Physics, Condensed Matter. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3600160
ISBN:	9781303502033

Measurements of Interaction-Driven States in Monolayer and Bilayer Graphene.
Feldman, Benjamin Ezekiel.

Measurements of Interaction-Driven States in Monolayer and Bilayer Graphene. - 162 p.

Source: Dissertation Abstracts International, Volume: 75-02(E), Section: B.

Thesis (Ph.D.)--Harvard University, 2013.

In materials systems with flat energy bands and limited disorder, interactions among electrons dominate and can dramatically alter physical behavior. Traditionally, two-dimensional electron gases (2DEGs) have offered excellent platforms to study these effects because the kinetic energy of the electrons is effectively quenched by a perpendicular magnetic field. The recent discovery of graphene, a two-dimensional form of carbon, has opened the door for further exploration into many-body phenomena. Graphene, unlike conventional 2DEGs, has fourfold degenerate electronic states due to its spin and valley degrees of freedom. This thesis describes several experiments that show how these underlying symmetries combine with electron-electron interactions to produce novel and tunable correlated electronic phases of matter.

ISBN: 9781303502033Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Measurements of Interaction-Driven States in Monolayer and Bilayer Graphene.
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245 1 0 $a Measurements of Interaction-Driven States in Monolayer and Bilayer Graphene.
300 $a 162 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-02(E), Section: B.
500 $a Adviser: Amir Yacoby.
502 $a Thesis (Ph.D.)--Harvard University, 2013.
520 $a In materials systems with flat energy bands and limited disorder, interactions among electrons dominate and can dramatically alter physical behavior. Traditionally, two-dimensional electron gases (2DEGs) have offered excellent platforms to study these effects because the kinetic energy of the electrons is effectively quenched by a perpendicular magnetic field. The recent discovery of graphene, a two-dimensional form of carbon, has opened the door for further exploration into many-body phenomena. Graphene, unlike conventional 2DEGs, has fourfold degenerate electronic states due to its spin and valley degrees of freedom. This thesis describes several experiments that show how these underlying symmetries combine with electron-electron interactions to produce novel and tunable correlated electronic phases of matter.
520 $a We perform transport measurements of bilayer graphene flakes that are suspended above the substrate to minimize disorder. The data reveal full lifting of the degeneracy of the lowest Landau level (LL) due to electron-electron interactions as well as insulating behavior at the charge neutrality point. Using a scanning single-electron transistor (SET) to measure the local electronic compressibility, we quantitatively explore these broken-symmetry quantum Hall states as a function of magnetic field. Surprisingly, the measurements also reveal a correlated phase at zero electric and magnetic field.
520 $a When applied to suspended monolayer graphene, the high SET sensitivity and low disorder afforded by local measurements combine to reveal a multitude of fractional quantum Hall (FQH) states whose sequence differs from that in conventional 2DEGs. This unique pattern reflects the spin and valley degeneracies in graphene, and changing the magnetic field leads to a series of phase transitions between FQH states with different spin and/or valley polarization. We also perform compressibility measurements of a bilayer graphene sample on boron nitride that show an electron-hole asymmetric pattern of FQH states.
520 $a Finally, we conduct local compressibility measurements that reveal changes in behavior near a monolayer-bilayer graphene interface. These preliminary findings suggest that the energy gap at the charge neutrality point closes where the two sides meet and highlight the possibility of locally tuning the band structure in graphene systems.
590 $a School code: 0084.
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Electricity and Magnetism. $3 1019535
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710 2 $a Harvard University. $b Physics. $3 2094825
773 0 $t Dissertation Abstracts International $g 75-02B(E).
790 $a 0084
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3600160